Before 1947, amplified sound was underpowered and produced too much distortion. With the invention of the McIntosh circuit, less than 1% distortion became the performance standard. These majestic examples of the iconic MC30 have both been fully rebuilt and restored. After living with these in your listening room, we imagine you'll have a thing or two to say about "performance standards."
Production
1954-62
Condition
8/10
Serial No.
2EA83 / 7E220
Orig. MSRP
$153.50 ea.
Restoration
- Full 30-point service check
- Fully recapped
- Replaced tubes with a NOS matched set
- Cleaned controls, switches, and chassis
Factory Specs
Type Valve-based single-channel power amplifier
Power Supply 117 - 125 volts, 50/60 cycles
Power Consumption 135 watts at 30 watts output; 105 watts at zero signal output
Power Output 30 watts continuous
Input Level .5 volts to 30 volts, with gain control (standard input and octal pin 5); 2.5 volts (octal pin 2)
Frequency Range 20 to 30,000 cycles ±.1 dB at 30 watts output,
15 to 50,000 cycles ±.5 dB at 30 watts output,
10 to 1000,000 cycles ±1 dB at 15 watts output
Harmonic Distortion less than ⅓% if instantaneous peak power is below 60 watts between 20 and 20,000 Hz
Impulse Distortion negligible
Noise and Hum Level 90 dB or more below rated output
Damping Factor 12 or better for 4, 8 and 16 Ω output, 16 for 600Ω
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 and 600 Ω (600Ω is balanced to ground)
Phase Shift 20 cycles 3°, 20,000 cycles 9°
Tube Complement 12AX7 (preamp),
12AU7 (phase inverter),
12BH7 (voltage amp),
12AX7 (driver),
2x 1614 (output),
5U4-GA (rectifier)
Aux (Octal) Designed to power C-8 and other McIntosh Pre-Amplifiers
Size 13”W x 8”H x 8”D
Weight 30.5 lbs.
Documentation
McIntosh MC30 Owner's Manual & Schematics
The History of McIntosh
Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
Liner Notes
McIntosh, the world's most advanced amplifier is unequalled for quality reproduction of any sound source. Its unique circuitry provides ample reserve power combined with unprecedented low distortion - less than 0,5% harmonic distortion at all frequencies, 20-20,000 Hz (cycles) and at any volume, even full power. Designed for those who expect the finest, the McIntosh MC-30 sets a new standard among amplifiers today. It Brings an almost unbelievable clarity of tone - clean, pure living sound. Most important, you can listen to the McIntosh for hours without listening fatigue or irritation. For performance that really makes a difference, enjoy the McIntosh, masterfully crafted for your lifetime satisfaction.
Stock No.
7642360152285
