{"title":"McIntosh Tube Amplifiers","description":"\u003cp\u003eExplore current McIntosh vacuum-tube amplifiers across stereo, monoblock, integrated, and headphone-system designs. This collection focuses on tube architecture, loudspeaker and load matching, room scale, heat and ventilation, tube replacement, maintenance expectations, and long-term ownership.\u003c\/p\u003e\u003cp\u003eReturn to the \u003ca href=\"\/collections\/mcintosh-amplifiers\"\u003eMcIntosh amplifier guide\u003c\/a\u003e to compare system architectures. For dedicated solid-state and multichannel options, browse \u003ca href=\"\/collections\/mcintosh-power-amplifiers\"\u003eMcIntosh power amplifiers\u003c\/a\u003e. For a consolidated two-channel component that combines control and amplification, compare \u003ca href=\"\/collections\/mcintosh-integrated-amplifiers\"\u003eMcIntosh integrated amplifiers\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"mcintosh-mc275-2-channel-vacuum-tube-amplifier","title":"McIntosh MC275 2-Channel Vacuum Tube Amplifier","description":"\u003cstyle\u003e\u003c!--\nbody {font-family: Arial, sans-serif;}\n  .spec-table {border-collapse: collapse; width: 100%;}\n  .spec-table td, .spec-table th {border: 1px solid #ddd; padding: 8px;}\n  .spec-table tr:nth-child(even){background-color: #f2f2f2;}\n  .spec-table th {padding-top: 12px; padding-bottom: 12px; text-align: left; background-color: #f2f2f2; color: black;}\n        h1 {\n            font-size: 28px;\n        }\n--\u003e\u003c\/style\u003e\n\u003ch1\u003eMcIntosh MC275 Vacuum Tube Amplifier: A Timeless Audiophile Classic\u003c\/h1\u003e\n\u003cp\u003eDiscover the McIntosh MC275 Vacuum Tube Amplifier, a revered icon in the audiophile world. Initially launched in 1961, the MC275 quickly became a preferred choice for its robust power and low distortion capabilities. After a hiatus post-1971, it re-emerged in 1993 as a special edition commemorating co-founder Gordon Gow. Now in its sixth generation, the MC275 continues to impress with enhanced performance and a legacy of excellence.\u003c\/p\u003e\n\u003ch2\u003ePerformance and Versatility\u003c\/h2\u003e\n\u003cp\u003eThe MC275 is known for its dual-mode functionality, offering 75 watts per channel in stereo and 150 watts in mono. Suitable for speakers with 4, 8, or 16 ohms impedance, its Unity Coupling Circuit output transformer technology ensures full power delivery irrespective of speaker impedance. The amplifier's fuse-less Sentry Monitor™ offers reliable short-circuit protection, ensuring longevity and performance stability. Additionally, the MC275 features both balanced and unbalanced inputs, LED-illuminated tubes for operational status, and Power Control technology for seamless integration with other McIntosh components.\u003c\/p\u003e\n\u003ch2\u003eAudiophile Appeal\u003c\/h2\u003e\n\u003cp\u003eWhether you're a long-time audiophile or seeking to enhance your home audio setup with a vintage touch, the McIntosh MC275 Vacuum Tube Amplifier is an exceptional choice. Its storied history and superior performance make it a focal point in any high-fidelity audio system.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e75 watts per channel in stereo, 150 watts in mono\u003c\/li\u003e\n\u003cli\u003eMcIntosh output transformer with wide bandwidth\u003c\/li\u003e\n\u003cli\u003eEnhanced bass control and quiet thermal circuit design\u003c\/li\u003e\n\u003cli\u003eUtilizes four KT88, four 12AT7, and three 12AX7A vacuum tubes\u003c\/li\u003e\n\u003cli\u003eBoth balanced and unbalanced inputs\u003c\/li\u003e\n\u003cli\u003eSentry Monitor™ for fuse-less short-circuit protection\u003c\/li\u003e\n\u003cli\u003eGold-plated Solid Cinch™ speaker binding posts\u003c\/li\u003e\n\u003cli\u003eLED-illuminated tubes indicating operational status\u003c\/li\u003e\n\u003cli\u003ePower Control for integration with McIntosh components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Output per Channel\u003c\/td\u003e\n\u003ctd\u003e75W @ 4, 8 or 16 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Harmonic Distortion\u003c\/td\u003e\n\u003ctd\u003e0.5% max (250mW to rated power, 20Hz-20kHz); ≤ 0.25% at 1kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal-to-Noise Ratio\u003c\/td\u003e\n\u003ctd\u003e105dB below Rated Output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Headroom\u003c\/td\u003e\n\u003ctd\u003e1.2dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamping Factor\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Power Band\u003c\/td\u003e\n\u003ctd\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e+0, -0.5dB (20Hz-20,000Hz); +0, -3.0dB (10Hz-100,000Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eControl Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemote Power Control\u003c\/td\u003e\n\u003ctd\u003eYes, input and output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMulti-Channel DB25 Cable\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eGeneral Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit Configuration\u003c\/td\u003e\n\u003ctd\u003eUnity Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit Design\u003c\/td\u003e\n\u003ctd\u003eVacuum Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMono Bridge\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMono Parallel\u003c\/td\u003e\n\u003ctd\u003eYes, 150W @ 2, 4, 8 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eUnity Coupling Output Transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeters\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeter Light Switch\u003c\/td\u003e\n\u003ctd\u003eControlled by McIntosh preamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalanced Input\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Panel\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIllumination\u003c\/td\u003e\n\u003ctd\u003eLED for Small Signal Tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Style\u003c\/td\u003e\n\u003ctd\u003ePolished Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eConnectivity\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker Binding Post Type\u003c\/td\u003e\n\u003ctd\u003eSolid Cinch™ Speaker Binding Posts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cstrong\u003eWeight \u0026amp; Dimensions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit Dimensions (W x H x D)\u003c\/td\u003e\n\u003ctd\u003e16-1\/2\" x 8-1\/2\" x 12\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUnit Weight\u003c\/td\u003e\n\u003ctd\u003e67 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e75 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor more information, visit the official \u003ca href=\"https:\/\/www.mcintoshlabs.com\/products\/amplifiers\/MC275B\"\u003eMcIntosh MC275 Product Page\u003c\/a\u003e.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":41531809660975,"sku":"","price":7500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/mcintosh-mc275-2-channel-vacuum-tube-amplifier-820395.webp?v=1717078539"},{"product_id":"mcintosh-ma2375-vacuum-tube-integrated-amplifier","title":"McIntosh MA2375 Vacuum Tube Integrated Amplifier","description":"\u003cp\u003eThe McIntosh MA2375 Vacuum Tube Integrated Amplifier combines an all-tube preamplifier and power amplifier in a single two-channel component. It delivers 75 watts per channel into 4-, 8- or 16-ohm speakers through McIntosh Unity Coupled Output Transformers.\u003c\/p\u003e\u003cp\u003eIts signal path uses two 12AX7A and two 12AT7 tubes in the preamplifier section, four 12AT7 driver tubes and four KT88 output tubes. The MA2375 is designed for listeners who want a complete analog McIntosh system center with line-level sources, vinyl playback, headphones and optional subwoofer integration.\u003c\/p\u003e\u003ch2\u003eMcIntosh MA2375 highlights\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAll-tube integrated-amplifier design\u003c\/li\u003e\n\u003cli\u003e75 watts per channel into 4, 8 or 16 ohms\u003c\/li\u003e\n\u003cli\u003eMcIntosh Unity Coupled Output Transformers\u003c\/li\u003e\n\u003cli\u003eTwo balanced and three unbalanced line-level inputs\u003c\/li\u003e\n\u003cli\u003eUniversal moving-magnet and moving-coil phono input\u003c\/li\u003e\n\u003cli\u003eAdjustable phono gain, resistance loading and capacitance\u003c\/li\u003e\n\u003cli\u003eFive-band analog equalizer with bypass\u003c\/li\u003e\n\u003cli\u003eDedicated subwoofer output and variable unbalanced preamplifier output\u003c\/li\u003e\n\u003cli\u003eHigh Drive headphone output with Headphone Crossfeed Director\u003c\/li\u003e\n\u003cli\u003eHome Theater PassThru, Power Control, Data Ports and RS232 integration\u003c\/li\u003e\n\u003cli\u003ePower Guard Screen Grid Sensor and Sentry Monitor protection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAll-tube amplification\u003c\/h2\u003e\u003cp\u003eThe MA2375 uses vacuum tubes throughout its preamplifier, driver and output stages rather than combining tubes with a solid-state power section. McIntosh Unity Coupled Output Transformers provide dedicated 4-, 8- and 16-ohm speaker connections so the amplifier can deliver its rated power across common loudspeaker impedances.\u003c\/p\u003e\u003ch2\u003eAnalog and phono connectivity\u003c\/h2\u003e\u003cp\u003eSix analog inputs accommodate balanced and unbalanced source components, including a universal phono input configurable for moving-magnet or moving-coil cartridges. The phono section provides adjustable gain, resistance loading and capacitance to support more precise cartridge matching.\u003c\/p\u003e\u003cp\u003eA dedicated subwoofer output supports a 2.1-channel system, while the variable unbalanced output can feed an additional power amplifier or another system component. The MA2375 is an all-analog amplifier and does not include a DAC, digital inputs or built-in network streaming.\u003c\/p\u003e\u003ch2\u003eKey specifications\u003c\/h2\u003e\u003cdiv class=\"table-responsive\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAmplifier type\u003c\/th\u003e\n\u003ctd\u003eAll-tube integrated amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePower output\u003c\/th\u003e\n\u003ctd\u003e75 watts per channel into 4, 8 or 16 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eOutput tubes\u003c\/th\u003e\n\u003ctd\u003eFour KT88\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDriver tubes\u003c\/th\u003e\n\u003ctd\u003eFour 12AT7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePreamplifier tubes\u003c\/th\u003e\n\u003ctd\u003eTwo 12AX7A and two 12AT7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eInputs\u003c\/th\u003e\n\u003ctd\u003e2 balanced, 3 unbalanced and 1 configurable MM\/MC phono\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eOutputs\u003c\/th\u003e\n\u003ctd\u003eSubwoofer output and variable unbalanced preamplifier output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eEqualizer\u003c\/th\u003e\n\u003ctd\u003eFive-band analog equalizer with bypass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHeadphone output\u003c\/th\u003e\n\u003ctd\u003eHigh Drive with Headphone Crossfeed Director\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e17-13\/16 in W × 9-15\/16 in H × 20-7\/16 in D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e93 lb net; 103 lb shipping\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eConsultation and speaker matching\u003c\/h2\u003e\u003cp\u003eAudio Exchange is an authorized McIntosh dealer in Richmond, Virginia. Contact our team to discuss loudspeaker compatibility, cartridge and phono-stage setup, subwoofer integration, private demonstrations, delivery and complete system installation.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45414399836207,"sku":"MA2375","price":15000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/mcintosh-ma2375-vacuum-tube-integrated-amplifier-angle.webp?v=1785802170"},{"product_id":"mcintosh-mc3500-mk-ii-power-amplifier","title":"McIntosh MC3500 Mk II 1-Channel Vacuum Tube Power Amplifier","description":"\u003ch2\u003eMcIntosh MC3500 Mk II: 350-Watt Vacuum Tube Monoblock Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMcIntosh MC3500 Mk II\u003c\/strong\u003e is a 1-channel vacuum tube power amplifier rated at 350 watts into 2, 4, or 8 ohms. Inspired by the original MC3500 amplifiers used to power the sound system at Woodstock, the Mk II combines the model’s distinctive industrial design with modern McIntosh tube-amplifier engineering, protection systems, and connectivity.\u003c\/p\u003e\n\u003cp\u003eEach MC3500 Mk II powers one loudspeaker channel, so a conventional two-channel stereo system requires two amplifiers. Its Unity Coupled Circuit output transformer allows the full rated output to be delivered across common loudspeaker impedances, making this high-power tube monoblock suitable for demanding full-range speakers and large listening rooms.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose the McIntosh MC3500 Mk II?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e350-watt monoblock output:\u003c\/strong\u003e Delivers 350 watts into 2, 4, or 8 ohms from a single amplifier channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power vacuum tube design:\u003c\/strong\u003e Uses eight EL509S output tubes selected for their durability and high peak-current capability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully balanced driver section:\u003c\/strong\u003e Three 12AX7A tubes and one 12AT7 tube handle the input, buffer, voltage-amplification, and output-driver stages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnity Coupled Circuit:\u003c\/strong\u003e McIntosh’s output-transformer design helps provide full rated power across different speaker impedances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Guard Screen Grid Sensor™:\u003c\/strong\u003e Monitors output-tube screen-grid current and dynamically reduces the input signal when necessary to help protect the tubes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSentry Monitor™:\u003c\/strong\u003e Shuts the amplifier down if output current exceeds safe operating limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible connections:\u003c\/strong\u003e Balanced and unbalanced inputs and outputs support conventional systems as well as bi-amplified and tri-amplified configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDualView™ power meter:\u003c\/strong\u003e Displays output power and amplifier warmup progress from the center of the front panel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho Is the MC3500 Mk II Best Suited For?\u003c\/h2\u003e\n\u003cp\u003eThe MC3500 Mk II is intended for listeners who want the scale and authority of a very high-powered amplifier while retaining an all-tube signal path. Its 350-watt rating makes it appropriate for large rooms, full-range loudspeakers, lower-sensitivity designs, and systems expected to reproduce wide dynamic swings without giving up the presentation associated with McIntosh vacuum tube amplification.\u003c\/p\u003e\n\u003cp\u003eBecause each amplifier weighs 121 pounds and generates substantial heat, installation planning matters. The supporting furniture or amplifier stands should be rated for the weight of a stereo pair, and the tubes require adequate open ventilation above and around the chassis.\u003c\/p\u003e\n\u003ch2\u003eMcIntosh MC3500 Mk II vs. MC275\u003c\/h2\u003e\n\u003cp\u003eThe MC3500 Mk II and \u003ca href=\"\/products\/mcintosh-mc275-2-channel-vacuum-tube-amplifier\"\u003eMcIntosh MC275\u003c\/a\u003e are both Unity Coupled vacuum tube amplifiers, but they address very different systems. The MC275 delivers 75 watts per channel in stereo or 150 watts when configured as a monoblock. The MC3500 Mk II is a dedicated monoblock that supplies 350 watts to one channel and requires two units for stereo playback.\u003c\/p\u003e\n\u003cp\u003eThe MC275 is the more compact and flexible choice for efficient speakers and moderate-size rooms. The MC3500 Mk II is designed for systems requiring far greater output, dynamic headroom, and loudspeaker control. Explore the complete \u003ca href=\"\/collections\/mcintosh-power-amplifiers\"\u003eMcIntosh power amplifier collection\u003c\/a\u003e for additional solid state, tube, and hybrid options.\u003c\/p\u003e\n\u003ch2\u003eMcIntosh MC3500 Mk II Specifications\u003c\/h2\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"border:1px solid #ddd;padding:9px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:9px;text-align:left;\"\u003eMC3500 Mk II\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eChannels\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003ePower Output\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e350 watts into 2, 4, or 8 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eCircuit Configuration\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eUnity Coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eCircuit Design\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eVacuum tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eOutput Tubes\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e8 × EL509S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eDriver Tubes\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e3 × 12AX7A; 1 × 12AT7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eRated Power Band\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e20Hz to 20kHz: +0\/-0.5dB; 10Hz to 70kHz: +0\/-3dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eTotal Harmonic Distortion\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e0.3% maximum from 250mW to rated power; less than 0.20% at 1 watt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eSignal-to-Noise Ratio\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e120dB below rated output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eDynamic Headroom\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e2.4dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eDamping Factor\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eGreater than 25 wideband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eInputs and Outputs\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eBalanced and unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eDimensions\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e18 in W × 11-13\/16 in H × 21-5\/8 in D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:9px;\"\u003e121 lb; 147 lb shipping weight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs the McIntosh MC3500 Mk II sold as a pair?\u003c\/h3\u003e\n\u003cp\u003eNo. The MC3500 Mk II is a single-channel monoblock amplifier and is sold individually. Two amplifiers are required for a standard stereo system.\u003c\/p\u003e\n\u003ch3\u003eHow many vacuum tubes does the MC3500 Mk II use?\u003c\/h3\u003e\n\u003cp\u003eEach amplifier uses eight EL509S output tubes, three 12AX7A tubes, and one 12AT7 tube, for a total of twelve vacuum tubes per monoblock.\u003c\/p\u003e\n\u003ch3\u003eCan it power 2-ohm speakers?\u003c\/h3\u003e\n\u003cp\u003eYes. The Unity Coupled output transformer provides dedicated connections for 2-, 4-, and 8-ohm loudspeakers, with a rated output of 350 watts at each impedance.\u003c\/p\u003e\n\u003ch3\u003eDoes the MC3500 Mk II need ventilation?\u003c\/h3\u003e\n\u003cp\u003eYes. This is a high-powered vacuum tube amplifier and should be installed with generous airflow around the chassis and above the protective tube cage.\u003c\/p\u003e\n\u003ch3\u003eWhat warranty is included?\u003c\/h3\u003e\n\u003cp\u003eNew units purchased through an authorized McIntosh dealer include McIntosh’s 3-year limited warranty, subject to the manufacturer’s current registration and warranty terms.\u003c\/p\u003e\n\u003ch2\u003eAuthorized McIntosh Dealer Support\u003c\/h2\u003e\n\u003cp\u003eAudio Exchange is an authorized McIntosh dealer serving Richmond, Central Virginia, and clients planning reference-level audio systems throughout the region. Our team can help assess loudspeaker compatibility, preamplifier matching, ventilation and support requirements, trade-ins, delivery, and professional installation.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45730457321519,"sku":"MC3500MKII","price":17500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/MC3500_Mk_II_Angle.webp?v=1785606368"},{"product_id":"mcintosh-mc1502-vacuum-tube-amplifier","title":"McIntosh MC1502 2-Channel Vacuum Tube Power Amplifier","description":"\u003ch2\u003eMcIntosh MC1502: 150-Watt Stereo Vacuum Tube Power Amplifier\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMcIntosh MC1502\u003c\/strong\u003e is a high-power stereo vacuum tube amplifier designed for reference-quality two-channel music systems. It delivers \u003cstrong\u003e150 watts per channel\u003c\/strong\u003e into 2, 4 or 8 ohms, combining classic McIntosh tube-amplifier character with the control, low noise and speaker compatibility expected from a modern flagship design.\u003c\/p\u003e\n\u003cp\u003eAs the direct successor to the limited-edition MC2152, the MC1502 offers the same audio specifications and performance in a more traditional McIntosh design. It can also be viewed as the larger, more powerful sibling to the iconic \u003ca href=\"\/products\/mcintosh-mc275-2-channel-vacuum-tube-amplifier\"\u003eMcIntosh MC275\u003c\/a\u003e, with twice the stereo output power and an improved 112dB signal-to-noise ratio.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose the McIntosh MC1502?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 watts x 2 channels:\u003c\/strong\u003e Full rated output is available into 2, 4 or 8-ohm loudspeakers through McIntosh Unity Coupled Circuit output transformers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSixteen vacuum tubes:\u003c\/strong\u003e Eight KT88 output tubes, four 12AX7A tubes and four 12AT7 tubes are divided evenly between the left and right channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuiet, controlled performance:\u003c\/strong\u003e A 112dB signal-to-noise ratio helps the MC1502 deliver the low background noise and wide dynamic range expected from a modern reference amplifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in protection:\u003c\/strong\u003e Sentry Monitor continuously watches output current and shuts the amplifier down if operating limits are exceeded.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium construction:\u003c\/strong\u003e The tubes and transformers sit on a mirror-polished stainless-steel chassis, protected by a black powder-coated stainless-steel wire cage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible connectivity:\u003c\/strong\u003e Balanced and unbalanced inputs, Power Control connections and Solid Cinch speaker binding posts simplify integration into a complete McIntosh system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDesigned for Serious Two-Channel Systems\u003c\/h3\u003e\n\u003cp\u003eThe MC1502 is well suited to demanding floorstanding speakers, larger listening rooms and listeners who want the dimensional presentation of a tube amplifier without giving up substantial power or bass control. Air-Pipe cooling around the KT88 sockets supports long tube life, while ceramic signal-tube sockets with gold-plated contacts help maintain dependable performance.\u003c\/p\u003e\n\u003cp\u003eBecause the amplifier weighs \u003cstrong\u003e118 pounds\u003c\/strong\u003e and produces significant heat, it requires a sturdy equipment stand, generous ventilation and adequate clearance above the tube cage. Careful placement should be planned before installation.\u003c\/p\u003e\n\u003ch3\u003eMcIntosh MC1502 Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier Type\u003c\/th\u003e\n\u003ctd\u003e2-channel vacuum tube power amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Output\u003c\/th\u003e\n\u003ctd\u003e150 watts per channel into 2, 4 or 8 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVacuum Tubes\u003c\/th\u003e\n\u003ctd\u003e8 x KT88, 4 x 12AX7A, 4 x 12AT7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCircuit Configuration\u003c\/th\u003e\n\u003ctd\u003eUnity Coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTotal Harmonic Distortion\u003c\/th\u003e\n\u003ctd\u003e0.5% maximum from 250mW to rated power, 20Hz–20kHz; less than 0.20% at 1 watt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-to-Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e112dB below rated output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Headroom\u003c\/th\u003e\n\u003ctd\u003e1.2dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDamping Factor\u003c\/th\u003e\n\u003ctd\u003eGreater than 18\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e+0\/-0.25dB, 20Hz–20kHz; +0\/-3dB, 10Hz–70kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs\u003c\/th\u003e\n\u003ctd\u003eBalanced and unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e18-1\/4 inches W x 10-1\/4 inches H x 21 inches D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e118 lbs; 135 lbs shipping weight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e3-year limited warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes the MC1502 require a separate preamplifier?\u003c\/h4\u003e\n\u003cp\u003eYes. The MC1502 is a power amplifier and should be connected to a suitable stereo preamplifier through its balanced or unbalanced inputs.\u003c\/p\u003e\n\u003ch4\u003eCan the MC1502 power 2-ohm speakers?\u003c\/h4\u003e\n\u003cp\u003eYes. Dedicated 2, 4 and 8-ohm speaker connections allow the Unity Coupled output transformers to deliver the full rated 150 watts per channel to a wide range of loudspeakers.\u003c\/p\u003e\n\u003ch4\u003eCan the MC1502 be bridged for mono use?\u003c\/h4\u003e\n\u003cp\u003eNo. The MC1502 is designed as a two-channel stereo amplifier and does not support mono bridge or mono parallel operation.\u003c\/p\u003e\n\u003ch4\u003eHow does the MC1502 compare with the MC275?\u003c\/h4\u003e\n\u003cp\u003eThe MC1502 delivers 150 watts per channel, twice the MC275's 75-watt stereo rating. It is also larger and heavier, and its 112dB signal-to-noise ratio is quieter than a pair of MC275 amplifiers operated for comparable output.\u003c\/p\u003e\n\u003ch3\u003eAuthorized McIntosh Dealer Support\u003c\/h3\u003e\n\u003cp\u003eAudio Exchange is an authorized McIntosh dealer serving Richmond, Virginia and customers throughout the United States. Our team can assist with system matching, speaker compatibility, placement, ventilation and delivery planning. Explore more models in our \u003ca href=\"\/collections\/mcintosh-power-amplifiers\"\u003eMcIntosh Power Amplifiers collection\u003c\/a\u003e.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45730491105327,"sku":"MC1502","price":14000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/MC1502_Angle_Left.webp?v=1785608950"},{"product_id":"mcintosh-mc2301-vacuum-tube-monoblock-amplifier","title":"McIntosh MC2301 300-Watt Vacuum Tube Monoblock Amplifier","description":"\u003ch2\u003eMcIntosh MC2301: 300-Watt Vacuum Tube Monoblock Power\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMcIntosh MC2301 vacuum tube monoblock amplifier\u003c\/strong\u003e combines substantial output power with the dimensional, natural presentation associated with high-performance tube amplification. Rated at 300 watts into 2, 4, or 8 ohms, it is designed to control demanding loudspeakers while preserving musical texture, scale, and dynamic impact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePlease note: The MC2301 is a single-channel monoblock amplifier sold individually. A conventional two-channel stereo system requires two MC2301 amplifiers.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAs the first McIntosh vacuum tube amplifier to incorporate a Quad Balanced circuit design, the MC2301 is engineered to cancel noise and distortion before they reach the loudspeaker. Its patented Unity Coupled Circuit output transformer makes the full rated output available across multiple speaker impedances, allowing the amplifier to deliver consistent performance with a wide range of premium loudspeakers.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e300 watts from one vacuum tube channel\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFull rated power into 2, 4, or 8 ohm loudspeakers\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuad Balanced circuit design\u003c\/strong\u003e for reduced noise and distortion\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eUnity Coupled Circuit output transformer\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSentry Monitor™ protection\u003c\/strong\u003e with automatic reset\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eBalanced XLR and unbalanced RCA inputs\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMcIntosh Power Control\u003c\/strong\u003e for coordinated system operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIlluminated blue power-output meter\u003c\/strong\u003e with meter-light control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen polished stainless-steel chassis\u003c\/strong\u003e with visible vacuum tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold individually\u003c\/strong\u003e for mono, stereo, or multi-amplifier system design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e300 Watts for Demanding Loudspeakers\u003c\/h2\u003e\n\u003cp\u003eMany tube amplifiers prioritize finesse but offer limited output. The MC2301 is designed to provide both. Its 300-watt output gives it the headroom needed for large listening rooms, wide dynamic swings, and loudspeakers that require substantial current and control. Because the full rated power is available from the dedicated 2-, 4-, and 8-ohm outputs, the amplifier can be matched correctly to a broad range of speaker designs.\u003c\/p\u003e\n\u003cp\u003eIn a stereo system, one MC2301 powers the left speaker and a second powers the right. This dedicated-channel approach provides each loudspeaker with its own amplifier and power supply, supporting strong channel separation and effortless musical scale.\u003c\/p\u003e\n\u003ch2\u003eQuad Balanced Vacuum Tube Design\u003c\/h2\u003e\n\u003cp\u003eThe MC2301 was the first McIntosh tube amplifier to use the company’s Quad Balanced architecture. The design combines two complete amplifier sections and uses their opposing behavior to cancel much of the noise and distortion generated within the circuit. The result is the tonal richness and spatial presentation listeners seek from vacuum tubes, paired with the low-noise performance expected from a reference McIntosh system.\u003c\/p\u003e\n\u003ch2\u003eUnity Coupled Circuit Output Transformer\u003c\/h2\u003e\n\u003cp\u003eMcIntosh’s patented Unity Coupled Circuit output transformer is central to the MC2301 design. It couples the vacuum tube output stage to the loudspeaker while allowing the amplifier to deliver its complete 300-watt rating into 2-, 4-, or 8-ohm loads. This helps maintain consistent performance and gives system designers greater freedom when matching the amplifier with different loudspeakers.\u003c\/p\u003e\n\u003ch2\u003eSentry Monitor Protection\u003c\/h2\u003e\n\u003cp\u003eSentry Monitor™ provides fuse-less short-circuit protection for the output stage. If operating current exceeds a safe level, the protection circuit temporarily disengages the output stage and automatically restores operation when conditions return to normal. This protection is designed to safeguard the amplifier without placing a conventional fuse directly in the signal path.\u003c\/p\u003e\n\u003ch2\u003eBalanced and Unbalanced System Integration\u003c\/h2\u003e\n\u003cp\u003eBoth balanced XLR and unbalanced RCA inputs are provided, making the MC2301 compatible with a wide variety of preamplifiers and system layouts. McIntosh Power Control allows compatible components to power on and off together, while the selectable meter illumination lets the amplifier’s visual presentation be adjusted for the listening environment.\u003c\/p\u003e\n\u003ch2\u003eClassic McIntosh Presentation\u003c\/h2\u003e\n\u003cp\u003eThe MC2301 presents its vacuum tube output stage openly around the signature illuminated blue wattmeter. A black glass front panel, brushed aluminum handles, polished stainless-steel chassis, and visible tube glow give the amplifier the unmistakable appearance of a flagship McIntosh component.\u003c\/p\u003e\n\u003ch2\u003eMcIntosh MC2301 at Audio Exchange\u003c\/h2\u003e\n\u003cp\u003eAudio Exchange is an authorized McIntosh dealer in Richmond, Virginia. Our team can help determine whether the MC2301 is appropriate for your loudspeakers, room size, listening preferences, preamplifier, and overall system design. We can also assist with stereo-pair planning, equipment placement, ventilation, cabling, delivery, and installation.\u003c\/p\u003e\n\u003cp\u003eContact Audio Exchange for current availability, a private consultation, or help building a complete McIntosh two-channel system. Explore our \u003ca href=\"\/collections\/mcintosh-power-amplifiers\"\u003eMcIntosh Power Amplifiers\u003c\/a\u003e, \u003ca href=\"\/collections\/mcintosh-tube-amplifiers\"\u003eMcIntosh Tube Amplifiers\u003c\/a\u003e, and the complete \u003ca href=\"\/collections\/mcintosh\"\u003eMcIntosh Labs\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier Type\u003c\/th\u003e\n\u003ctd\u003eVacuum tube monoblock power amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Channels\u003c\/th\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Output\u003c\/th\u003e\n\u003ctd\u003e300 watts into 2, 4, or 8 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Power Band\u003c\/th\u003e\n\u003ctd\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTotal Harmonic Distortion\u003c\/th\u003e\n\u003ctd\u003e0.5% maximum from 250mW to rated power, 20Hz–20kHz; 0.25% or less at 1kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-to-Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e117dB below rated output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Headroom\u003c\/th\u003e\n\u003ctd\u003e1.2dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDamping Factor\u003c\/th\u003e\n\u003ctd\u003eGreater than 15 wideband\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e+0, -0.5dB from 20Hz–20kHz; +0, -3dB from 10Hz–100kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCircuit Configuration\u003c\/th\u003e\n\u003ctd\u003eQuad Balanced, Unity Coupled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Type\u003c\/th\u003e\n\u003ctd\u003eUnity Coupled Circuit output transformer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs\u003c\/th\u003e\n\u003ctd\u003eBalanced XLR and unbalanced RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRemote Power Control\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Meter\u003c\/th\u003e\n\u003ctd\u003eIlluminated wattmeter with meter-light switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeaker Connections\u003c\/th\u003e\n\u003ctd\u003e200-amp, three-way binding posts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFront Panel\u003c\/th\u003e\n\u003ctd\u003e1\/2-inch black glass with handles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003ctd\u003eOpen stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e17-3\/4 in W × 12-5\/16 in H × 23 in D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnit Weight\u003c\/th\u003e\n\u003ctd\u003e116 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e141 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e3-year limited manufacturer warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSale Configuration\u003c\/th\u003e\n\u003ctd\u003eSold individually; two required for conventional stereo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45732064133167,"sku":"MC2301","price":15500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/mcintosh-mc2301-vacuum-tube-monoblock-amplifier-front.jpg?v=1785690601"},{"product_id":"mcintosh-mha200-vacuum-tube-headphone-amplifier","title":"McIntosh MHA200 Vacuum Tube Headphone Amplifier","description":"\u003ch2\u003eMcIntosh MHA200: Vacuum Tube Amplification for High-End Headphones\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMcIntosh MHA200 vacuum tube headphone amplifier\u003c\/strong\u003e brings the company’s classic tube-amplifier architecture to a compact component designed specifically for personal listening. Four selectable headphone impedance ranges, balanced and unbalanced analog inputs, and three headphone connection options allow the MHA200 to drive a broad range of premium wired headphones while preserving the smooth, dimensional presentation associated with McIntosh tube amplification.\u003c\/p\u003e\n\u003cp\u003eA pair of 12AT7 dual-triode tubes handles voltage amplification, while two 12BH7A tubes provide the power needed to drive the headphone outputs. McIntosh Unity Coupled Circuit output transformers match the tube amplifier section to headphone loads from 32 to 1,000 ohms and deliver the rated 500 milliwatts across all four selectable ranges.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eDedicated two-channel vacuum tube headphone amplifier\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e500mW headphone power output\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour selectable impedance ranges:\u003c\/strong\u003e 32–100, 100–250, 250–600, and 600–1,000 ohms\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTwo 12AT7 and two 12BH7A vacuum tubes\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMcIntosh Unity Coupled Circuit output transformers\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eBalanced XLR and unbalanced RCA analog inputs\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eBalanced 4-pin XLR headphone output\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDedicated left and right 3-pin XLR headphone outputs\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eStandard 1\/4-inch stereo headphone output\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eVariable volume control with a marked Unity Gain position\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePower Control input and output for compatible McIntosh systems\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePolished stainless-steel chassis and included protective tube cover\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFour Headphone Load Settings\u003c\/h2\u003e\n\u003cp\u003eThe front-panel LOAD selector provides four impedance ranges: 32–100 ohms, 100–250 ohms, 250–600 ohms, and 600–1,000 ohms. Rather than relying only on voltage gain to accommodate different headphones, the MHA200 uses dedicated secondary windings in its Unity Coupled Circuit transformers to provide proper power transfer across each range.\u003c\/p\u003e\n\u003cp\u003eThis approach makes the amplifier suitable for many modern planar-magnetic headphones, conventional dynamic headphones, and high-impedance reference models. Selecting the range that matches the connected headphones helps the amplifier provide appropriate gain, headroom, and control.\u003c\/p\u003e\n\u003ch2\u003eBalanced and Unbalanced Headphone Connections\u003c\/h2\u003e\n\u003cp\u003eThe front panel supports three headphone-connection formats. A 4-pin XLR connector provides balanced stereo output, while separate 3-pin XLR connectors support dedicated left and right balanced connections. A standard 1\/4-inch stereo jack accommodates conventional single-ended headphone cables.\u003c\/p\u003e\n\u003cp\u003eBecause these outputs are driven by the same transformer-coupled tube amplifier, the MHA200 can be integrated into a high-end headphone system without forcing the listener into one cable standard.\u003c\/p\u003e\n\u003ch2\u003ePurely Analog Signal Path\u003c\/h2\u003e\n\u003cp\u003eThe MHA200 is an \u003cstrong\u003eanalog headphone amplifier\u003c\/strong\u003e and does not contain a digital-to-analog converter, USB input, network streamer, Bluetooth receiver, or digital audio input. It should be connected to the analog output of a DAC, network streamer, CD player, phono preamplifier, preamplifier, or other line-level source.\u003c\/p\u003e\n\u003cp\u003eOne pair of balanced XLR inputs and one pair of unbalanced RCA inputs are provided. Only one input source should be used at a time because the amplifier does not include an input-selector switch.\u003c\/p\u003e\n\u003ch2\u003eDirect Source or Preamplifier Operation\u003c\/h2\u003e\n\u003cp\u003eThe front-panel VOLUME control allows the MHA200 to be connected directly to a fixed-level analog source. When it is used with a preamplifier or source component that already provides variable output, the MHA200 volume control can be placed at its marked Unity Gain position and listening level can be controlled from the upstream component.\u003c\/p\u003e\n\u003cp\u003eBalanced inputs make it practical to position the compact amplifier close to the listening chair while using longer balanced interconnects from the main system or equipment rack.\u003c\/p\u003e\n\u003ch2\u003eUnity Coupled Circuit Tube Design\u003c\/h2\u003e\n\u003cp\u003eMcIntosh developed the Unity Coupled Circuit in the company’s earliest vacuum tube amplifiers. In the MHA200, a pair of specially adapted output transformers couples the 12BH7A output tubes to the headphone connections while maintaining stable performance across the selectable load ranges.\u003c\/p\u003e\n\u003cp\u003eA custom toroidal power transformer is designed for low mechanical hum and a low magnetic field, helping reduce noise near the sensitive audio circuitry. The published signal-to-noise ratio is 94dB, with a frequency response of 20Hz to 20kHz at +0, -0.5dB.\u003c\/p\u003e\n\u003ch2\u003eCompact McIntosh Construction\u003c\/h2\u003e\n\u003cp\u003eThe MHA200 measures only 6-1\/8 inches wide and 9-1\/8 inches deep, making it easy to place on a desk, side table, or dedicated headphone stand. Its mirror-polished stainless-steel chassis reflects the green glow of the tubes, while die-cast aluminum side panels carry the classic McIntosh name.\u003c\/p\u003e\n\u003cp\u003eAn included ventilated tube cover can be installed to protect the vacuum tubes without preventing normal operation. Power Control input and output connections allow coordinated on\/off control with compatible McIntosh components.\u003c\/p\u003e\n\u003ch2\u003eMcIntosh MHA200 at Audio Exchange\u003c\/h2\u003e\n\u003cp\u003eAudio Exchange is an authorized McIntosh dealer in Richmond, Virginia. Our team can help match the MHA200 with suitable headphones, DACs, streamers, source components, balanced cables, and complete two-channel systems.\u003c\/p\u003e\n\u003cp\u003eContact Audio Exchange for current availability or assistance building a reference personal-listening system. Explore our \u003ca href=\"\/collections\/headphone-amps\"\u003eHeadphone Amplifiers\u003c\/a\u003e, \u003ca href=\"\/collections\/mcintosh-tube-amplifiers\"\u003eMcIntosh Tube Amplifiers\u003c\/a\u003e, and complete \u003ca href=\"\/collections\/mcintosh\"\u003eMcIntosh Labs\u003c\/a\u003e collection.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eAmplifier Type\u003c\/th\u003e\n\u003ctd\u003eTwo-channel vacuum tube headphone amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone Power Output\u003c\/th\u003e\n\u003ctd\u003e500mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone Load Ranges\u003c\/th\u003e\n\u003ctd\u003e32–100 ohms; 100–250 ohms; 250–600 ohms; 600–1,000 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVacuum Tubes\u003c\/th\u003e\n\u003ctd\u003eTwo 12AT7 dual triodes and two 12BH7A dual triodes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutput Type\u003c\/th\u003e\n\u003ctd\u003eUnity Coupled Circuit output transformers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRated Power Band\u003c\/th\u003e\n\u003ctd\u003e20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e+0, -0.5dB from 20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTotal Harmonic Distortion\u003c\/th\u003e\n\u003ctd\u003e0.5% maximum from 250mW to rated power, 20Hz to 20kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIntermodulation Distortion\u003c\/th\u003e\n\u003ctd\u003e0.04% typical; 0.4% maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Headroom\u003c\/th\u003e\n\u003ctd\u003e1.5dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSignal-to-Noise Ratio\u003c\/th\u003e\n\u003ctd\u003e94dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDamping Factor\u003c\/th\u003e\n\u003ctd\u003eGreater than 150\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage Gain\u003c\/th\u003e\n\u003ctd\u003e12dB at 32 ohms; 17dB at 100 ohms; 21dB at 250 ohms; 25dB at 600 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBalanced Input Sensitivity\u003c\/th\u003e\n\u003ctd\u003e2.0Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnbalanced Input Sensitivity\u003c\/th\u003e\n\u003ctd\u003e1.0Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Balanced Input\u003c\/th\u003e\n\u003ctd\u003e16V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Unbalanced Input\u003c\/th\u003e\n\u003ctd\u003e8V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInput Impedance\u003c\/th\u003e\n\u003ctd\u003e20k ohms balanced; 10k ohms unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAnalog Inputs\u003c\/th\u003e\n\u003ctd\u003eOne stereo pair balanced XLR; one stereo pair unbalanced RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone Outputs\u003c\/th\u003e\n\u003ctd\u003eOne 4-pin balanced XLR; one pair 3-pin balanced XLR; one 1\/4-inch stereo jack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDigital Inputs \/ DAC\u003c\/th\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Control\u003c\/th\u003e\n\u003ctd\u003eOne input and one output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Requirement\u003c\/th\u003e\n\u003ctd\u003e120V, 50\/60Hz, 1.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandby Power\u003c\/th\u003e\n\u003ctd\u003eLess than 0.5 watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e6-1\/8 in W × 5-3\/4 in H × 9-1\/8 in D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnit Weight\u003c\/th\u003e\n\u003ctd\u003e10.5 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShipping Weight\u003c\/th\u003e\n\u003ctd\u003e12 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIncluded Accessory\u003c\/th\u003e\n\u003ctd\u003eProtective vacuum tube cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e3-year limited manufacturer warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":45732101554223,"sku":"MHA200","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0235\/1375\/9791\/files\/mcintosh-mha200-vacuum-tube-headphone-amplifier-left-angle.jpg?v=1785694132"}],"url":"https:\/\/audio-exchange.com\/collections\/mcintosh-tube-amplifiers.oembed","provider":"Audio-Exchange","version":"1.0","type":"link"}