**Please be sure and check out our newly launched website with additional items for sale** www.skyfiaudio.com/collections/all
This is the fifth iteration of this classic and well loved design which many believe to be the best. Let your ears be the judge.
Like new with very low hours of use.
Complete with manual, box, tube cage, all inner packaging, and power cord.
Very very slight signs of use showing an occasional finger print or swirl mark on the chrome from cleaning.
Otherwise looks new. Everything works as it should.
This is your chance to add a modern classic to your collection which is sure to appreciate over time.
Will probably outperform the stock market over time :-)
Description and Design
Like the MC275 of yore, the current model is rated at 75Wpc (though McIntosh Labs' tech man, Chuck Hinton, says it can actually pump out 90Wpc), and it weighs the same 67 lbs. Much of that heft comes from the two output transformers, which are, with the exception of one quality, identical to the original's, even to the point of being wound on the same equipment at McIntosh's production facility in Binghamton, New York. The wire in the old transformers was made of lacquered copper, which tended to harden and become brittle. The new wiring is still copper, but it's insulated with a far more durable synthetic material.
The MC275's transformers utilize the same "unity-coupled circuit" that McIntosh invented in 1947. The two primary strands—one connected through the power supply to the plate and cathode of one of the output tubes, the other connected in the same manner to the other tube—are tightly wound together, turn for turn, for complete magnetic coupling. This creates almost instantaneous local feedback, which is said to reduce distortion. In the original and all subsequent versions of the MC275, including this one, a third winding is connected to the plates of the cathode follower driver; this was said to extend the ultra-low distortion over a much greater bandwidth, especially into the high frequencies.
Also like the original, the new MC275 uses four KT88 power-output tubes, three 12AX7A input and phase-inverter tubes, and four 12AT7 voltage-amplifier and driver tubes.
All else, though, is different from the original, to varying degrees. The chassis, once chrome-plated steel bent to shape (and thus prone to cracks and rust), is now highly polished stainless steel. The tube cage, formerly of fine mesh with solid ends, now has larger perforations and slotted ends, to allow more even ventilation. (When listening, I removed the cage, in part because I liked watching the tubes glow, and in part because, in my experience, cages of this sort usually vibrate. First, however, I received assurances from McIntosh that the cage was entirely for safety purposes, and that removing it wouldn't harm the sound.) The plating on the tube pins, once nickel, is now gold, and the ceramic output-tube sockets have heat chimneys that let cool air flow more freely from under the chassis, thus prolonging the life of the tubes—a McIntosh innovation that began with the MC275's fourth incarnation.
The new model also uses 1% precision resistors and polypropylene capacitors, for lower noise; the specified signal/noise ratio is 100dB, or 10dB higher than the original's. Balanced inputs have been added; a rear-panel switch lets you choose that option, and if you do, the first 12AX7 tube is bypassed for a more direct connection, though this results in lower gain. The original MC275 had several circuit boards, with all component parts wired point to point. The new version has just one military-grade board, on which the components and tube sockets are directly mounted. Hinton maintains that this results in less induced noise and crosstalk. A rear-panel switch allows the amp to be converted into a monoblock, with the two channels driven in parallel to cope more efficiently with low-impedance speakers.
Finally, the new model has a detachable power cord and an On/Off switch (though, as it's placed under the terminal panel, it's a bit awkward to get at). More welcome still, the old-fashioned terminal strips for speaker cables have been replaced by gold-plated, five-way binding posts. This is the only significant change since the version that Sam Tellig reviewed—very positively—in the July 2004 Stereophile.
Description: Two-channel, tubed stereo (switchable to parallel mono operation) power amplifier. Tube complement: four KT88, three 12AX7A, four 12AT7. Inputs: 1 pair single-ended (RCA), 1 pair balanced (XLR). Loudspeaker outputs: separate gold-plated, 5-way binding posts for 4, 8, and 16 ohms. Preamp output: 1 pair single-ended (RCA). Inputs: 1 pair balanced (XLR), 1 pair single-ended (RCA). Output power: 75Wpc (18.8dBW) into 4, 8, or 16 ohms (stereo), 150W into (21.8dBW) 2, 4, or 8 ohms (mono). Frequency response: 20Hz–20kHz, +0/–0.5dB; 10Hz–70kHz, +0/–3dB. Signal/noise ratio: 100dB, A-weighted (no reference level given). THD: 0.05% at any power level from 250mW to rated power output. Input sensitivity: 1.2V unbalanced, 2.5V balanced. Input impedance: 90k ohms unbalanced, 180k ohms balanced. Damping factor: >14 (wideband). Power consumption: 170W (idle), 360W (full power).
Dimensions: 16.5" (420mm) W by 8.25" (210mm) H by 12" (305mm) D. Weight: 67 lbs (30.5kg) net, 75 lbs (34.1kg) shipping.
Manufacturer: McIntosh Laboratory, 2 Chambers Street, Binghamton, NY 13903-2699. Tel: (800) 538-6576, (607) 723-3512
Read more at: https://www.stereophile.com/content/mcintosh-mc275-power-amplifier-specifications#o7Cm6LZExD0rzo17.99
This item will be professionally packaged and insured for safe transit to your home.
If we don’t have the original manufacture's packaging, we use heavy duty double ply corrugated boxes with Instapak expanding foam custom inserts. In many cases this has proven to be better than the original packaging. We also use high quality fiber reinforced tape to seal our packages. Lightweight items will be bubble wrapped and shipped in a high-quality box.
This item is available for pickup in Ridgewood, NJ or Union Square, NYC (with convenient parking in the building).
NJ Residents or anyone picking up without a resale certificate will need to pay NJ Sales Tax.
Use the Buy It Now button and we will cover the PayPal fees.
Thanks for looking and be sure to call or text 646.852.2073 with any questions.
Please also be sure and visit our Audiogon e-store to see the rest of the items we have for sale www.audiogon.com/stores/skyfi
**And be sure to check out our newly launched website with additional items for sale** www.skyfiaudio.com/collections/all
WHO WE ARE
Skyfi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of select high end audio equipment. We only buy equipment the we admire and are passionate about. No mid-fi, no gimmicks, and no junk.
Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold. We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.
Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support. If you are local and are looking for any new equipment for the above-mentioned manufacturers, please drop us a line as we can arrange both sales and professional installation in the tri-state area
We do not accept or review any offers that do not go through the official Audiogon system. We have too many items for sale and its nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers.
If you do not see a “Make an Offer” button, it means we are not considering any offers on that item.
We prefer working through PayPal, which allows you to use a credit card or bank transfer. We do not charge extra for any payment fees if you purchase the item at the asking price. You can also send us a personal check (which will need to clear before shipping), certified check, money order, or wire transfer. International clients without access to PayPal should use a bank wire transfer.
If you are picking up an item, we do not accept PayPal. You must pay in person with cash, certified or bank check, or wire transfer. If you make a PayPal payment and are picking up the item, it will be returned.
TRADE IN POLICY
We accept trade-ins of equal or lesser value under certain conditions. Simply ask and let us know the exact model, condition, and the accessories that are included. Such as the original box, remote, manual, etc. We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. and will typically pass on displays, projectors, receivers, dated processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind we are running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment. If you are looking for top dollar we suggest attempting to sell it directly to an end user on your own.
SELL US YOUR GEAR (Working or Broken)
We will also purchase your used or broken gear and arrange pickup if you are in our local market. Just drop us a note for a quote but be sure to include the condition and what is included.
HOW TO VISIT US
We are currently operating from a residence in Ridgewood, NJ. You are welcome to make an appointment if there is a piece of equipment you would like to see in operation before or after purchase. We have a well-equipped, dedicated listening room with tons of equipment of all makes and models. We are not a store, so please don’t make an appointment if you are just curious as to how a speaker or piece of equipment sounds. In essence, no tire kickers please.
If you are in NYC and cannot make it out to Ridgewood, we can arrange pickup in Union Square (14th Street) after the purchase. You can call or text 646.852.2073 with any questions or to schedule an appointment. We can also arrange to install, calibrate, and tune the gear in your listening room if you are local to the area. This is super useful when purchasing large speakers or heavy amplifiers. It is also great for ensuring your new turntable is setup correctly in its final resting place.
Thanks for looking and please send us your email address if you would like to receive a list of the equipment we receive from time to time. We promise not to bombard you with junk email.