MCINTOSH MA-5100 VINTAGE PREAMP VERY NICE

Up for auction is a vintage Mcintosh preamp model MA-5100. It is in alright condition, I give it a 7.4. I tested the amp and it turns on when I flip the ON switch. But when I flip the speaker switch it just make this loud hummy noise. I don't know if its an easy fix or not but I have no idea how to fix it. Also the lights don't turn on the left and the right side of the front panel, just the middle. Great for somebody who knows how to fix these amps. If you have any questions please message me. No reserve, no refunds I have described the amp the best I can. Thanks for looking!!!
ELECTRICAL: 45w/ch stereo, 90w mono. Response 20-20kHz (+0.5 -0.5dB). Distortion 0.25%. Noise and hum -75dB high level, -70dB low level re 10mV. Output impedance 4, 8 or 16 ohms. Damping factor 100. Power amp noise -90dB. Input sensitivity and impedance: high level 0.3V at 250k, phono 2.0mV at 47k, tape head 2.0mV at 500k. Tape output 0.3V. Dual concentric tone controls +18dB to -18dB. LF filter 50Hz at 12dB/oct. HF filter 5k at 12dB/oct. Phase switch: 0 or 180. L+R adjustable to 6V at 5k ohms.

FRONT PANEL: Glass panel at top. Input selector: aux, tape, tuner, phono 1, phono 2 and tape hd. Bass and treble each dual concentric. Volume. Mode selector: L to L+R, R to L+R, stereo rev, stereo, mono (L+R), L+R to L and L+R to R. Balance. Rocker switches: comp: RIAA or LP, tape monitor, phase, speaker, power, LF filter, HF filter, loudness. Indicator lights for tape, speaker and power. Headphone jacks.

BACK PANEL: Barrier terminals for speakers. Outputs: tape and L+R. High level inputs: tape mon, aux, tape, tuner. Low level inputs: ph 1, ph 2, tape hd. Ground binding post. L+R gain control. AC outlets: 3 switched, 1 unswitched. Fuse.

Size 5-7/16"H, 16"W and 14-1/2"D. Weight 25 lbs. Sold from 1966-1972. Last retail price $449.00

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