{"product_id":"mcintosh-c26-vintage-solid-state-preamplifier-serviced","title":"McIntosh C26 Vintage Solid State Preamplifier - Serviced","description":"\u003cp\u003e\u003cb\u003eGeneral:\u003c\/b\u003e\u003cbr\u003eThe McIntosh C26 is a well-built vintage solid-state preamplifier that remains a popular choice for both collectors and those putting together a classic Hi-Fi system. It offers the clean styling and thoughtful design McIntosh is known for, and would pair well with their famous MR78 tuner and MC240 amplifier we also have listed.\u003cbr\u003e\u003cbr\u003eFeatures include dual phono inputs, making it easy to connect two turntables or cartridges without changing cables, as well as dual tape loops for recording or integrating additional components. The rear panel also includes switched and unswitched AC outlets for powering other equipment, making the C26 a flexible preamplifier for a variety of system configurations.\u003cbr\u003e\u003cbr\u003eOne added benefit about this particular C26 is that it still has its original front glass which is relatively rare, this makes the illuminated panel look particularly well.\u003cbr\u003e\u003cbr\u003eIn testing, it performed as it should and all controls operate quietly with no scratchy pots or intermittent switches. This unit has also been serviced in-house, where several age-related components were replaced as preventative maintenance to improve long-term reliability.\u003cbr\u003e\u003cbr\u003eAs with everything that leaves our shop, it will be packed carefully to ensure it arrives safely.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Cosmetic Notes:\u003c\/b\u003e\u003cbr\u003eThis unit was stored in a wood cabinet for the majority of its life so it presents very well overall. The faceplate does has some paint wear. The \"O\" in the Loudness text is missing and there are a couple of points where light shows through the lettering or black mask. We prefer to keep the original glass in place even with minor defects when possible since the new production glass from the factory propagates light differently. Overall Excellent given its age.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Technical Notes:\u003c\/b\u003e\u003cbr\u003eThis unit was serviced here at SkyFi. We replaced the axial electrolytic and tantalum capacitors, disassembled and serviced the volume control\/power switch, cleaned the remaining controls, and detailed the RCA jack plate. \u003cbr\u003e\u003cbr\u003eNOTE: There is a slight channel imbalance in the volume control around the 30% mark. The rest of the control tracks surprisingly well.\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, Speaker Spring Terminals, Power outlets\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\u003eJust the unit and power cord.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePacking:\u003c\/b\u003e\u003cbr\u003eWill be packed using our highly developed in-house process and custom packing materials.\u003ciframe width=\"1280\" height=\"720\" src=\"https:\/\/www.youtube.com\/embed\/wuWesEecAbE?\u0026amp;autoplay=1\u0026amp;mute=1\" title=\"This Is How We Pack Sensitive Electronics at SkyFi Audio, Less Than 0.2% Shipping Damage\"\u003e\u003c\/iframe\u003e\u003cb\u003eSpecs:\u003c\/b\u003e\u003cbr\u003eFrequency response: 20 Hz to 20 kHz\u003cbr\u003eTotal harmonic distortion: 0.1%\u003cbr\u003eGain: 62 dB (MM), 20 dB (line)\u003cbr\u003eInput sensitivity: 2mV (MM), 250mV (line)\u003cbr\u003eSignal to noise ratio: 74 dB (MM), 85 dB (line)\u003cbr\u003eOutput: 250mV (line), 2.5V (Pre out)\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDimensions:\u003c\/b\u003e\u003cbr\u003e16\" x 5.4\" x 13\" (406.4 x 138.1 x 330mm)\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e\u003cbr\u003e31 lbs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApproximate Age:\u003c\/b\u003e\u003cbr\u003e1970\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\/C26-P-AG-OWNERS.pdf?rev=9861c585be704ca3bae53ecfdd65d53d\u0026amp;revision=9861c585-be70-4ca3-bae5-3ecfdd65d53d\" 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\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.\u003c\/p\u003e","brand":"McIntosh","offers":[{"title":"Default Title","offer_id":48778009968894,"sku":"107879","price":2448.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3275\/9084\/files\/mcintosh-c26-vintage-solid-state-preamplifier-serviced-767.jpg?v=1787681003","url":"https:\/\/skyfiaudio.com\/en-gb\/products\/mcintosh-c26-vintage-solid-state-preamplifier-serviced","provider":"SkyFi Audio","version":"1.0","type":"link"}