McIntosh MA230 Tube Integrated Amplifier
Collectors piece from the late 60’s and one of the most sought after tube integrated amps from McIntosh.
Just serviced where any malfunctioning component was replaced. All controls were lubricated and are working quietly and smoothly.
Some very slight pitting on the chrome but very presentable. The metal and glass faceplate are super clean and free from scratches or blemishes.
All decals on top of transformers and top cover are the best I’ve seen.
On the front you’ll find the usual controls plus two settings for phono input (RIAA and LF), phase 0-180, low and high frequency filters, and loudness.
If you would like a wooden cabinet with this unit please inquire.
ELECTRICAL: Stereo. Hybrid (solid state preamp and tube power amplifier). 30w/ch stereo, 60w mono. Response 20-20kHz (+0 -0.5dB). Distortion 0.5%. Noise and hum -75dB high level, -60dB low level . Output impedance 4, 8 and 16 ohms. Damping factor 10. Input sensitivity and impedance: high level 0.25V at 250k, phono 1.5mV at 47k, tape head 1.5mV at 1 meg. Tape output 0.25V into 25k. L+R output 10V into 5k. Dual concentric tone controls +18dB to -18dB. LF filter 50Hz at 12dB/oct. HF filter 5k at 12dB/oct.
FRONT PANEL: Glass panel at top. Anodized gold at bottom. 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: 0 or 180, speaker: on or off, power: on or off, LF: flat or filter, HF: flat or filter, loudness: flat or compensate. Headphone jacks. Red power indicator.
BACK PANEL: Barrier strips for 4, 8, and 16 ohms, Outputs: Tape and L+R. High level inputs: tape mon, aux, tape and tuner. Low level inputs: ph 1, ph 2 and tape hd. Ground binding post. AC outlets: 2 switched, 1 unswitched. Fuse.
TUBES: 4-7591, 2-12AU7, 12AX7.
Size 5-7/16"H, 16"W and 14-1/2"D. Weight 43 lbs.
Sold from 1963-1966.