McIntosh MC60 Vintage Tube Monoblocks

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This vintage pair of McIntosh MC60 monoblock amplifiers were modified by a hobbyist at some point in the past.

These amplifiers are from slightly different production runs during their original 1955-1961 availability. One amp has a choke in the power supply, the other does not. The amp without the choke also has some neon bulbs on the tag board as shown in our listing photos.

The slight differences in design do not affect the final outcome, as they tested the same in our lab and in our listening tests.

Both amps were tested at our bench and fundamentally work.

Both were driven into clipping with a 1 kHz sine wave and meet the official McIntosh 60W power specification.

Although these amps technically work, we recommend further service/restoration before putting them into daily use.

They are both good bones for a restoration, or someone looking to experience the glory of vintage tube monoblocks from McIntosh.

During our testing we did notice an intermittent issue where the grid bias of one output tube would drop, causing the associated tube to red plate (not what you want to happen with any tube in operation). This issue was resolved by swapping out the final 12AX7 tube before the output tubes.

*Please note this listing includes the 2 x MC60 units, along with the vacuum tubes pictured in our images. Nothing else is included with your purchase.

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Speaker Cables

Click here for a PDF copy of the McIntosh MC60 Original Sales Brochure

Click here for a PDF copy of the McIntosh MC60 Owner's Manual

Click here for a PDF copy of the McIntosh MC60 Service Manual parts list and Schematic

ELECTRICAL AND MECHANICAL SPECIFICATIONS
Specifications for the Mclntosh Model MC-60 Audio Amplifier

Power Supply:
117/125 volts, 50/60 cycles

Power Consumption:
280 watts at 60 watts output
155 watts at zero signal output

Power Output:
60 watts continuous

Input Level:
Input #1, 0. 5 volts to 30 volts, with gain control
Input #2, 2. 5 volts (for use with Mclntosh Audio Compensators and Pre-Amps)

Frequency Range:
20 to 30,000 cycles ± .1 db at 60 watts output
16 to 60,000 cycles ± .5 db at 60 watts output
1.0 to 100,000 cycles ± 1.0 db at 30 watts output

Harmonic Distortion:
Less than 0.5% at 60 watts output or less, 20 to 20, 000 cycles.

Intermodulation Distortion:
Less than 0.5% instantaneous peak power is be- low 120 watts

Impulse Distortion:
Negligible

Noise and Hum Level:
90 db or more below rated output

Damping Factor:
12 or better for 4, 8, and 16 ohm output, 16 for 600 ohms

Input Impedance:
0. 5 meg for 0. 5 volt input and 0. 13 meg for 2. 5 volt input, 20 cycles to 40 KC

Output Impedance:
4, 8, 16, 83 (70.7 volts) and 600 ohms (600 ohm is balanced to ground)

Phase Shift:
±8° 20-20.000 cycles

Tube Compliment:
Rectifier: 2-5U4GB
Pre-Amp: 12AX7
Phase Inverter: 12AU7
Voltage Amp: 12BH7
Driver: 12AX7
Output: 2 KT-88/6550

Auxiliary Equipment Connection:
Designed to power C-4, C-8 and other Mclntosh pre-amplifiers

Size - EACH:
14" x 10" x 8" high, chassis type construction

Weight - EACH:
46 pounds net

Finish:
Chrome and Black