McIntosh MC352 tube pre-amp [Template]

Inherited from my father, retired Army Colonel now interred at Arlington. He had a substantial collection of audio equipment, and his two most prized McIntosh pieces (MC352 and C2200) were bequeathed to me. Look for the other listing if you want the pair. I live in a condo and don't have the space for a proper listening room, so I feel saddened but must part with these. They worked fine the last time I checked them out, and were very carefully cared for over the years with modest to limited use. Meets the Excellent criteria easily.

Remote Control and Owner's Manual not included.

Original OEM Box with matching serial number included.

DOUBLE-BALANCED PUSH-PULL DESIGN
The MC352 is fully balanced from input to speaker output. Matched amplifiers operate in complimentary push-pull with their outputs combined in the McIntosh autoformer. The resulting double-balanced configuration cancels virtually all distortion.

EXCLUSIVE MCINTOSH OUTPUT AUTOFORMERS
An impedance mismatch between an amplifier and loudspeaker can cause distortion and a reduction in power. The legendary McIntosh autoformer is a hand crafted transformer with output connections for 2, 4 and 8 ohms (plus 1, 2 and 4 ohms for the MC352's mono parallel mode), allowing an ideal impedance match. A McIntosh amplifier with an autoformer can also safely drive multiple speakers connected in parallel without shortening the life expectancy of the output stage. There is absolutely no performance penalty with an autoformer. In fact, its frequency response exceeds that of the output circuit itself, and extends well beyond the audible range. Distortion is so low it is virtually immeasurable.

EXCLUSIVE MCINTOSH POWER ASSURANCE SYSTEM
Power Assurance is a collection of technologies that enhance performance and reliability and protect the amp and the loudspeakers.

Power Guard® clipping protection
Power Guard ensures that the amplifier will always deliver full power without causing clipping distortion. If an amplifier channel is overdriven, Power Guard automatically reduces the input volume just enough to keep distortion below 2% and prevent any clipping distortion. Thanks to an optical resistor, Power Guard acts literally at the speed of light, producing absolutely no audible side effects. An amplifier with Power Guard will actually deliver clipping-free output well above its rated power.

Sentry Monitor® current protection
Sentry Monitor continually senses the voltage and current of the output stage and confines it to a safe limit. Sentry Monitor does not limit power output.

Specifications

RMS Power Output
Min. sine wave continuous average power output per channel from 20Hz to 20kHz with all channels operating Stereo: 350W per channel (8/4/2 ohms) Mono Parallel: 700W (4/2/1 ohms)
Output Load Impedance
Stereo: 2, 4 or 8 ohms · Mono Parallel: 1, 2 or 4 ohms
Rated Power Band 20Hz to 20kHz
Peak Output Current > 100 amperes
Total Harmonic Distortion
0.005% maximum at any level from 250 mw to rated power output per channel from 20Hz to 20kHz with all channels operating
Intermodulation Distortion
0.005% maximum if instantaneous peak power output does not exceed twice the output power rating
Dynamic Headroom 2.1dB
Frequency Response
20Hz to 20kHz, +0 / -0.25dB · 10Hz to 100kHz, +0 / -3.0dB
Input Sensitivity Unbalanced: 1.9V Balanced: 3.8V
S/N Ratio (A-Weighted)
Unbalanced: 85dB (116dB below rated output) Balanced: 115dB (124dB below rated output)
Damping Factor 40
Input Impedance Unbalanced: 20k ohms Balanced: 40k ohms
Power Guard®
Clipping is prevented and THD does not exceed 2% with up to 14dB overdrive at 1kHz
Power Requirements
100V 50/60Hz, 14.4A · 110V 50/60Hz, 13.0A
120V 50/60Hz, 12.0A · 220v 50/60Hz, 6.50A
230V 50/60Hz, 6.25A · 240V 50/60Hz, 6.00A
Dimensions (h x w x d)
inch: 8.89 x 17.5 x 21 cm: 22.58 x 44.5 x 53.3
Weight
105 lbs. (47.63kg) net 138 lbs. (63kg) shipping
350 WPC Balanced Amp. Designed by Charlie Randall.
Shipping weight: 160 lbs.