{"product_id":"mcintosh-ma6200-vintage-integrated-amp-serviced","title":"McIntosh MA6200 Vintage Integrated Amp - Serviced","description":"\u003cp\u003e\u003cb\u003eGeneral:\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eRather rare integrated amp from McIntosh. We do not get these often, and they are some of our favorites.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eGreat features include a built-in 90W amplifier with that signature sweet McIntosh sound, a very capable 5-band equalizer, McIntosh Power Guard, dual phono inputs, dual tape loops, and loudness control. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe 5-band EQ is a particularly fantastic and iconic McIntosh feature, allowing for precise tonal adjustments to better match your room, speakers, and personal listening preferences. Unlike simple bass and treble controls, it offers significantly greater flexibility for fine-tuning the sound, making it easy to get the most out of a wide variety of recordings and listening environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAs a bonus, this particular amp has been fully serviced by our in-house technician, with all known failure-prone components replaced. All functions now work flawlessly, and it is a joy to use. It also benefits from brand-new glass.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt will be shipped in an original McIntosh carton so it arrives safely at its new home.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSkyFi Cosmetic Notes:\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eVery light signs of wear on side panels. The original glass faceplate was damaged. It has been replaced with a reproduction piece of glass from the McIntosh factory. Note that the new glass propagates light differently than the original glass resulting in look that is often described as \"less bight.\" Overall Excellent shape.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSkyFi Technical Notes:\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eThe MA6200 was serviced in house here at SkyFi Audio. We replaced the aging electrolytic capacitors in the power supply board, line stage, phono stage, auto on, and amplifier sections. Select lamps were replaced as needed. All controls have been cleaned and all functions verified. \u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eBrand Background:\u003c\/b\u003e\u003cbr\u003eMcIntosh Laboratory is an American manufacturer of handcrafted high-end audio equipment based in Binghamton, New York. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOwnership:\u003c\/b\u003e\u003cbr\u003eSingle Owner\u003cbr\u003e\u003cbr\u003e\u003cb\u003eConnections:\u003c\/b\u003e\u003cbr\u003eRCA Inputs and outputs, captive power cord, convenience power outlets. Spring speaker terminals.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eGeneral Sound:\u003c\/b\u003e\u003cbr\u003eSmooth, uncolored, undistorted natural and clean\u003cbr\u003e\u003cbr\u003e\u003cb\u003eCosmetic Condition:\u003c\/b\u003e\u003cbr\u003e7\/10 = Good. One or two minor scratches. Well Maintained. See our detailed rating description \u003ca href=\"https:\/\/skyfiaudio.com\/pages\/our-rating-scale\" target=\"_blank\"\u003ehere\u003c\/a\u003e.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWorking Condition:\u003c\/b\u003e\u003cbr\u003eWorking perfectly and tested in our lab and listening room.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eIncluded:\u003c\/b\u003e\u003cbr\u003eUnit and box\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePacking:\u003c\/b\u003e\u003cbr\u003eOriginal Manufacturers Packing\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecs:\u003c\/b\u003e\u003cbr\u003eType Pre-main amplifier\u003cbr\u003ePower Amplifier Unit\u003cbr\u003eEffective output (20 Hz to 20 kHz) 75W + 75W (8 Ω, THD 0.05%)\u003cbr\u003e100W + 100W (4 Ω, THD 0.05%)\u003cbr\u003eInput Sensitivity \/ Impedance 2.5V\/22k Ω\u003cbr\u003eSpeaker switching A, B, C\u003cbr\u003eTotal harmonic distortion factor 0.05% (0.25W ~ Effective Output, 20 Hz ~ 20 kHz)\u003cbr\u003eCross modulation distortion factor 0.05% (whole output band, whole circumference fraction)\u003cbr\u003eFrequency characteristic 20 Hz ~ 20 kHz + 0 -0.5 dB\u003cbr\u003eSignal-to-noise ratio 100dB\u003cbr\u003eDamping factor 30\u003cbr\u003eControl Amplifier Section\u003cbr\u003eInput Sensitivity \/ Impedance Phono1, 2 : 2mV\/47k Ω\u003cbr\u003eTuner, Aux1, 2, Tape1, 2 : 250mV\/100k Ω\u003cbr\u003eOutput Level \/ Impedance Rec out:0.25V\u003cbr\u003eSignal-to-noise ratio Phono:80dB\u003cbr\u003eAux, Tape : 95 dB\u003cbr\u003eTone control 5-element program equalizer\u003cbr\u003eCenter Frequency : 30 Hz, 150 Hz, 500 Hz, 1.5 kHz, 10 kHz\u003cbr\u003eEach ± 12 db variable\u003cbr\u003eLoudness control Continuously variable\u003cbr\u003eTape monitor Route 2\u003cbr\u003eTape copy 1 → 2, 2 → 1\u003cbr\u003eMode selector 7-point switching\u003cbr\u003ePremain separation Possible\u003cbr\u003eGENERAL\u003cbr\u003ePwer 100 VAC, 50Hz\/60Hz\u003cbr\u003eAC outlet Turntable interlock : 2 systems\u003cbr\u003ePower switch interlock : Route 3\u003cbr\u003ePower consumption 400W maximum\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDimensions:\u003c\/b\u003e\u003cbr\u003eWidth 15.98\" x Height 5.43\" x Depth 12.99\"\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003cbr\u003e30 lbs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApproximate Age:\u003c\/b\u003e\u003cbr\u003e1978\u003cbr\u003e\u003cbr\u003e\u003cb\u003eLink to Manual:\u003c\/b\u003e\u003cbr\u003e\u003ca href=\"https:\/\/www.mcintoshlabs.com\/-\/media\/Files\/mcintoshlabs\/DocumentMaster\/us\/Legacy\/MA6200-BX-OWNERS.pdf?rev=3688ebf1175d48d7ab82b43530760daa\u0026amp;revision=3688ebf1-175d-48d7-ab82-b43530760daa\" target=\"_blank\"\u003eClick Here\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eRecommended Cables:\u003c\/b\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-hero-interconnects-pair-rca-ultraplate-or-wbt-connectors-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - RCA Interconnects\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-silver-streak-interconnects-pair-rca-ultraplate-or-wbt-connectors\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - RCA Interconnects\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003ca title=\"Kimber Kable - TAK-CU - New Speciality Series Tonearm Cable, New - SkyFi Audio\" href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-tak-cu-phono-cable-with-wbt-connectors\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - Phono Interconnects\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-8tc-8-tc-ascent-speaker-cables-pair-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - Speaker Cables\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-summit-series-monocle-xl-speaker-cables-pair-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Summit Series Monocle XL Speaker Cables (PAIR)\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-summit-series-bifocal-xl-bi-wire-speaker-cables-pair-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR)\u003c\/a\u003e - Best If Applicable \u003cbr\u003e\u003cbr\u003e\u003cb\u003eTesting Process:\u003c\/b\u003e\u003cbr\u003eWe start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR. \u003cbr\u003e\u003cbr\u003eIf the device has the ability to decouple the preamplifier from the power amplifier, we remove the jumpers and independently test each section. If the device cannot be decoupled, we assess the electronic condition of the piece by analyzing the speaker level output only. \u003cbr\u003e\u003cbr\u003eWe start by connecting the \"Pre-Out\" jacks of the integrated to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1 KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope.\u003cbr\u003e\u003cbr\u003eWe then switch to a 1 KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment.\u003cbr\u003e\u003cbr\u003eOnce the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources.\u003cbr\u003e\u003cbr\u003eIf the preamp section is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve.\u003cbr\u003e\u003cbr\u003eNext we test the power amplifier section by connecting the integrated amplifier speaker outputs to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1 KHz test signal at the \"Main In” jacks and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping.\u003cbr\u003e\u003cbr\u003eAt this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. We finish off the bench evaluation with a 1 KHz square wave check and a 20 Hz to 20 KHz sine sweep to assess the amplifier’s frequency response characteristics. \u003cbr\u003e\u003cbr\u003eThis battery of tests will usually reveal if the amplifier has any issues that need further attention. \u003cbr\u003e\u003cbr\u003eIf the preamp and power amp both pass these tests, we reconnect the sections and verify that the preamp section can drive the power amp to rated power with a 1KHz tone on one of the line level inputs. \u003cbr\u003e\u003cbr\u003eBefore the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics. \u003cbr\u003e\u003cbr\u003eIf the unit passes all of these tests it moves to our long term testing rig where we simulate real word operating conditions for 6-8 hours minimum. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.\u003cbr\u003e\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":48314428358910,"sku":"107018","price":5490.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3275\/9084\/files\/mcintosh-ma6200-vintage-integrated-amp-serviced-amplifier-275.jpg?v=1780589377","url":"https:\/\/skyfiaudio.com\/products\/mcintosh-ma6200-vintage-integrated-amp-serviced","provider":"SkyFi Audio","version":"1.0","type":"link"}