McIntosh MA230 Tube Integrated Amplifier - Serviced!

$3,999

Super clean survivor MA230 serviced and ready to please.

In superb cosmetic condition, being one of the best MA230's we've seen. Glass is near perfect, chrome has no rust or heavy pitting, and the metal work is very clean.

Capable of driving most vintage speakers AND a great value since it has a capable built-in phono stage. Rated at 30W.

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.

This is a highly collectible piece and pristine examples like these are increasing in value every year. McIntosh did not make many tube integrated amp models, making this a collectors piece from the late 60’s and one of the most sought after tube integrated amps from McIntosh.

If you would like a wooden cabinet with this unit please inquire.

Technical Specifications:

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.

Notes from our Technician:
This piece came to us having underwent a light restoration at some point in the past. Several of the top mounted filter caps have been "restuffed" with modern electrolytics.

We confirmed the quality of the work completed, then tested the remaining electrolytic capacitors. This unit fundamentally worked, but needed a new set of output tubes, and a good cleaning of the controls to perform up to manufacturer spec.

All four 7591 output tubes were replaced with current production Tung Sol reissue tubes. The driver tubes are vintage Daltron branded Japanese 12AX7 and 12AU7, all of which tested well on our modern and professional Amplitrex AT-1000 tester, and have plenty of life remaining.

Output Bias was set to .7V per tube as outlined in the official owners manual.

McIntosh MA230 Manual

More from McIntosh:

The new Mclntosh MA230 presents two outstanding "FIRSTS" for your home stereo listening enjoyment.
. . . The MA230 is the FIRST stereo preamp-amplifier on one chassis that meets the traditional rigorous Mclntosh engineering performance standards.
. . . The MA230 is the FIRST stereo instrument to combine a solid state preamplifier with a tube and transformer power amplifier on the same chassis.
The Mclntosh MA230 has eliminated all previous limitations of single chassis preamp- power amplifiers. The compact design of the MA230 preamplifier allows adequate space on the same chassis for a cool running 30 watt per channel tube power amplifier. You can now enjoy Mclntosh performance and reliability with the convenience of a complete single chassis stereo instrument.
The dramatic difference in the quality of music reproduction through Mclntosh instru- ments is due directly to low distortion performance. Mclntosh Laboratory is the only manufacturer in the entire industry to guar- antee and deliver the lowest distortion at all audio frequencies.

Long life, flexibility, and highest quality construction are characteristic designs in every Mclntosh instrument. Wide electrical and thermal margins of safety for all com- ponents, transistors and tubes add to the long life built into every Mclntosh product. Advanced engineering and cool operating design insure reliability and low maintenance costs. A Mclntosh instrument is without doubt the most economical and worthwhile long term investment in the high fidelity industry.

Once you have enjoyed the outstanding performance of the MA230, you will understand why Mclntosh products have earned their reputation as "THE BEST." Your Mclntosh MA230 stereo preamp-amplifier will give you years of the finest possible performance and will become a highly valued part of your home music system.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.

Item

Included

Original Box

No

Manual

Online

Remote

N/A

Cables

Yes - Power

Physical Condition

7

Working Condition

10

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