{"product_id":"mcintosh-c22-mkiv-tube-preamplifier","title":"McIntosh C22 MKIV Tube Preamplifier - Rare Version","description":"\u003cb\u003eGeneral:\u003c\/b\u003e\u003cbr\u003eThe McIntosh C22 MK IV is one of our favorite variants of the C22 and a great alternative for someone considering a current production C22 MKV. \u003cbr\u003e\u003cbr\u003eThis version of the C22 features switches and aesthetics that are more in line with the original C22 than the current production MK V. It also stays closer to the original C22 design with (6) 12AX7 rather than a mix of 12AX7 and 12AT7 as seen in the MK V.\u003cbr\u003e\u003cbr\u003eDespite being replaced by the MKV, the C22 MK IV gives you everything you want in a modern capable preamp. Standout features include balanced XLR inputs and an MC\/MM phono stage. In testing it sounded great.\u003cbr\u003e\u003cbr\u003eIncluded with the preamp will be its original box, manual and remote control.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Cosmetic Notes:\u003c\/b\u003e\u003cbr\u003eThe unit is in excellent condition overall with only extremely minor present on the.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Technical Notes:\u003c\/b\u003e\u003cbr\u003eDue to the simplistic nature of this reissue, no muting function is available either on the front panel or remote. This unit has received a fresh set of McIntosh branded 12AX7 tubes.\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, XLR, Ground, IEC Power\u003cbr\u003e\u003cbr\u003e\u003cb\u003eGeneral Sound:\u003c\/b\u003e\u003cbr\u003eBig beautiful musical sound with little fatigue.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eCosmetic Condition:\u003c\/b\u003e\u003cbr\u003e8\/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. 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\u003eEverything like when it arrived new\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePacking:\u003c\/b\u003e\u003cbr\u003eOriginal Manufacturers Packing\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOriginal MSRP:\u003c\/b\u003e\u003cbr\u003e$6,000.00\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecs:\u003c\/b\u003e\u003cbr\u003e- Frequency Response:\u003cbr\u003e- 20Hz–20kHz (+0 \/ -0.5dB)\u003cbr\u003e- 10Hz–100kHz (+0 \/ -1dB)\u003cbr\u003e- Distortion:\u003cbr\u003e- 0.08% from 20Hz–20,000Hz\u003cbr\u003e- Signal to Noise Ratio (A-Weighted):\u003cbr\u003e- High Level: 98dB\u003cbr\u003e- Phono: 80dB\u003cbr\u003e- Output Rated:\u003cbr\u003e- 2.5V Unbalanced\u003cbr\u003e- 5V Balanced\u003cbr\u003e- 8V max. Unbalanced\u003cbr\u003e- 16V max. Balanced\u003cbr\u003e- Input Sensitivity and Impedance:\u003cbr\u003e- High Level: 450mV Unbalanced, 900mV Balanced at 20k ohms\u003cbr\u003e- Phono MM: 4.5mV at 47k ohms, 50–350pF (adjustable in 50pF steps)\u003cbr\u003e- Phono MC: 0.45mV at 10, 25, 50, 100, 200, 500, or 1,000 ohms and 100pF\u003cbr\u003e- Individual Tone Controls:\u003cbr\u003e- Bass and Treble: +10dB to -10dB\u003cbr\u003e- Voltage Gain:\u003cbr\u003e- High Level to Record Output: 0dB\u003cbr\u003e- High Level to Output 1 and 2: 15dB\u003cbr\u003e- Phono MM to Record Output: 40dB\u003cbr\u003e- Phono MC to Record Output: 60dB\u003cbr\u003e- Output Impedance:\u003cbr\u003e- 220 ohms\u003cbr\u003e- Headphone Load Impedance:\u003cbr\u003e- 16 ohms to 250 ohms\u003cbr\u003e- Power Requirements:\u003cbr\u003e- 120V at 75 Watts\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDimensions:\u003c\/b\u003e\u003cbr\u003e6\"H, 17-1\/2\"W and 18\"D.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003cbr\u003e27 lbs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApproximate Age:\u003c\/b\u003e\u003cbr\u003e2010\u003cbr\u003e\u003cbr\u003e\u003cb\u003eLink to Manual:\u003c\/b\u003e\u003cbr\u003e\u003ca href=\"https:\/\/www.mcintoshlabs.com\/-\/media\/Files\/mcintoshlabs\/DocumentMaster\/us\/c22b-rc-om01.pdf?rev=f3917beb421149348ed507b4178f449b\u0026amp;revision=f3917beb-4211-4934-8ed5-07b4178f449b\" 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\" target=\"_blank\" rel=\"noopener\"\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\" target=\"_blank\" rel=\"noopener\"\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\" target=\"_blank\" rel=\"noopener\"\u003eKimber Kable - Phono Interconnects\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/collections\/our-kimber-kable-collection\/products\/kimber-kable-ascent-series-hero-analog-interconnects-pair-balanced-xlr-connectors-new\" target=\"_blank\" rel=\"noopener\"\u003eKimber Kable - BALANCED XLR Connectors\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/collections\/our-kimber-kable-collection\/products\/kimber-kable-summit-series-silver-streak-analog-interconnects-pair-balanced-xlr-connectors-new\" target=\"_blank\" rel=\"noopener\"\u003eKimber Kable - BALANCED XLR Connectors\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-pk14-pk-14-ascent-power-cord-brand-new\" target=\"_blank\" rel=\"noopener\"\u003eKimber Kable - Power Cords\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-ascent-series-pk10-pk-10-power-cord-brand-new\" target=\"_blank\" rel=\"noopener\"\u003eKimber Kable - Power Cords\u003c\/a\u003e - Best\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\u003eWhen we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface.\u003cbr\u003e\u003cbr\u003eThe 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. If the preamp 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. If the preamp under test has balanced inputs and\/or outputs these are tested as well.\u003cbr\u003e\u003cbr\u003eWe finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected.\u003cbr\u003e\u003cbr\u003eIf the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":47229713285374,"sku":"106823","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3275\/9084\/files\/mcintosh-c22-mkiv-tube-preamplifier-rare-version-992.jpg?v=1756327148","url":"https:\/\/skyfiaudio.com\/en-gb\/products\/mcintosh-c22-mkiv-tube-preamplifier","provider":"SkyFi Audio","version":"1.0","type":"link"}