**Please click here to check out our newly launched SkyFi Audio website with additional items for sale**
We recently restored three of these classic beauties and boy were the results worth the trouble! Perfect is also not a word we throw around lightly here, but in this case it's warranted.
Classic McIntosh looks - but with a vintage feel. Absolutely gorgeous, and capable of powering most modern and vintage speakers.
Priced accordingly, so if you're looking for an unserviced bargain on a 50 years "young" piece of audio excellence, please look elsewhere.
Serviced by AnalogiQue in New York City back in 2008. This service involved a partial recap of key sections, as well as a service bulletin update of the driver transistors on the driver cards.
On this piece we started out by verifying all of the previous work.
We found a handful of capacitors that were not part of the original 2008 restoration that had since gone out of spec. All of these caps were replaced.
We also upgraded the large filter cans which are now blue instead of silver.
LED bulbs were installed for the meter and lettering illumination.
The meters have been calibrated and the chassis was fully detailed and polished.
McIntosh MC2105 Manual
Performance Limits and Ratings
McIntosh audio power ratings are in accordance with the Federal Trade Commission Regulation of November 4, 1974 concerning power output claims for amplifiers used in home entertainment products.
105 watts minimum sine wave continuous average power output, per channel, both channels operating into 4 ohms, 8 ohms, or 1.6 ohms load impedance, which is:
20.5 volts RMS across 4 ohms
29.0 volts RMS across 8 ohms
41.0 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
4 ohms, 8 ohms, or 16 ohms; separate terminals are provided for each output
RATED POWER BAND
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION
0.25% maximum harmonic distortion at any power level from 250 milliwatts to 105 watts per channel from 20 Hz to 20,000 Hz, both channels operating
0.25% if instantaneous peak power output is 210 watts or less per channel with both channels operating for any combination of frequencies 20 Hz to 20,000 Hz
20 Hz to 20,000 Hz +0 -0.25 dB
10 Hz to 100,000 Hz +0 -3.0 dB at one watt output
NOISE AND HUM
90 dB below rated output
OUTPUT POWER MONITOR METER
Meter is calibrated to read +3 dB when amplifier produces 105 watts. Meter range switch is provided to increase meter sensitivity by 10 dB or 20 dB Calibration accuracy at 0 dB reading is ±2% at all frequencies; meter range accuracy is ±5%
25 volts for distribution lines
13 at 8 ohms output 18 at 4 ohms output 10 at 16 ohms output
0.5 volt. Level control provided for higher input voltage
120 volts 50 60 Hz, 75 watts at zero signal output, 430 watts at rated output
34 silicon transistors
18 silicon rectifiers and diodes
Front panel measures 16 3/16 inches wide (41,12 cm) by 71/8inches high (18,1 cm). Chassis measures 15 inches wide (38,1 cm) by 6 9/16 inches high (16.67 cm) by 141⁄2 inches deep (36.83 cm), including connectors. Knob clearance required is 11⁄2 inches (3.81 cm) in front of mounting panel
Front panel is anodized gold and black with special gold teal nomenclature illumination. Chassis is chrome and black
Exclusive Mclntosh developed professional PANLOC
65 pounds (29.48 kg) net, 77 pounds (34,93 kg) in shipping carton
The amplifier is completely stable when connected to any loudspeaker system or even to any reactive loads; The MC 2105 has special circuits to prevent damage by short circuit or open circuit of the output loads, or by any amount of output impedance mismatch, Thermal cutouts are mounted on the output transistor heat sinks to provide protection in the event of inadequate ventilation.
Peak reading - peak locking meters feature special circuit to respond to peak value of complex input signal
The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and tubes are inspected for signs of stress overheating or cracking.
We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If it all looks clean we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier the remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will also be tested.
We also test all tubes for output gain and leakage on our calibrated B&K 747 tester against the original manufacturers specifications. If needed, the tubes will be replaced from our vast NOS (New Old Stock) vintage or modern inventory.
Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.
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PURCHASING FROM SKYFI:
This item will be professionally packaged and insured for safe transit to your home unless you opt for local pickup from our shop. Please note that all local pickup items are only wrapped with industrial strength clear cling stretch wrap if the original manufacturer packaging is unavailable.
Local pickup is available in Glen Rock, NJ, just a half hour drive from Midtown Manhattan, with convenient parking near our building.
And if you’re looking to ship to Canada, simply follow this link to view and purchase this item. We ship to Canada via UPS Worldwide Expedited service and you’re responsible for any applicable import duties and taxes.
If we don’t have the original manufacture’s packaging, we use heavy duty double-ply corrugated boxes with custom made to your item 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.
Click here for specifics on our specialized packing process that separates us from the rest.
NJ Residents or anyone picking up without a resale certificate will need to pay NJ Sales Tax.
Thanks for looking and be sure to call us at 201-879-0000 with any questions.
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, 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, Pro-Ject Audio Systems, and Sony ES, we have access to OEM parts, service, and support. If you’re local and looking for new equipment from 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 it’s nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers.
We prefer working through PayPal which allows you to use a credit card, bank transfer, and their special financing to spread out payments over six months. We do not charge extra for any PayPal 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 bank wire transfer. International clients without access to PayPal should use a bank wire transfer.
If you’re picking up an item, we do not accept PayPal. You must pay in person with a certified check, bank check, or wire transfer. If you make a PayPal payment and are picking up the item, your PayPal payment will be returned.
TRADE IN POLICY:
We accept trade-ins of equal or lesser value under certain conditions. Simply click here to submit your gear for full consideration. 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 surround processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind we’re 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’re looking for top dollar, we suggest selling direct on your own.
SELL US YOUR GEAR (Working or Broken):
We’ll also purchase your used or broken gear and arrange pickup if you’re in our local market. Simply click here to submit your gear for full consideration.
SCHEDULING AN APPOINTMENT:
We are currently operating from our shop inside our dedicated building in Glen Rock, NJ. You’re welcome to make an appointment if there’s a piece of equipment you’d like to see in operation before or after purchase. We have several well-equipped and dedicated listening areas, plus a dedicated listening studio with tons of equipment of all makes and models. We’re not a store, so please don’t make an appointment if you’re just curious as to how a speaker or piece of equipment sounds. In essence - no tire kickers please.
You can call or text 201-879-0000 with any questions or to schedule an appointment. We can also arrange to install, calibrate, and tune your newly purchased gear in your listening room if you’re local to our area. This is super useful when purchasing large speakers or heavy amplifiers. It’s also great for ensuring your new turntable is setup correctly in its final resting place.