McIntosh MA 6100 Vintage Integrated Amplifier AUDIOPHILE SERVICED 100% MINT A+++

Description

McIntosh MA 6100 Vintage Integrated Amplifier
Serial #: 02766
OVERALL CONDITION: MINT
Excellent A+, Unit presents extremely well!
Fully serviced and bench tested. Scored 100%
PHOTOS
are considered part of the description. What you see in the photos is exactly what you get. Please view and zoom in on all pics for more details and a better understanding of the quality.
INCLUDED
Owners Manual
ORIGINAL FACTORY BOX
- We consider the factory box to be collectors item. As such, it will ship inside a new 275 lbs box.
COSMETICS
- Fully detailed and cleaned inside and out.
- The control panel is near mint.
- The cabinet is near mint.
- From a non-smoking environment.
SERVICED
BENCH TESTED A+ / SCORED 100%.
FULLY FUNCTIONAL, EVERYTHING WORKS AS IT SHOULD.
- All dust has been carefully removed from the interior of the unit and all exterior surfaces have been meticulously cleaned.
- Lamps replaced as needed.
- Repaired intermittent ground at crimped ferrule on one shielded cable.
-
ALL
Electrolytic capacitors checked and replaced as needed.
- Gain and Power Output measurements are correct.
- Control pots and switches have been cleaned and lubricated and operate flawlessly.
- All solder joints have been checked with a jewelers loupe for cold solder and reflowed where necessary.
- All knobs were removed and polished.
- New 1” McIntosh Factory feet installed.
GENERAL DESCRIPTION: (by “Modern Recording”)
The McIntosh MA-6100 is a stereo preamp/power amp combined on one chassis, or, as custom terms such a unit, an "integrated amplifier." Its features and controls are intended not only to appeal to the serious audiophile but to the advanced hobbyist too, including the owner more than casually interested in tape-recording.
It is possible to connect, all at once, to the MA-6100 two turntables, two tape recorders, two tuners, and any auxiliary (line-level) source. In addition to the normally expected inputs for tape (line-level) there is a stereo input for connection directly from a tape head, a feature once offered on deluxe preamps but not to be found on units of recent vintage. Provision also is made for "interrupting the circuit" between the pre- amp and power amp section via stereo preamp-out and power amp-in jacks, which permits the insertion of special accessory units such as speaker equalizers or other signal-shaping devices. It also permits the use of either section by itself for special applications.
Two sets of stereo speakers (nominally designated as "main" and "remote") may be hooked up and turned off or on from the front panel, where there also is a headphone jack. The headphone signal is not affected by the speaker selector switches. An unusual and useful feature in connection with the speaker options is a switch that selects the load impedance depending on what combination of speakers is being used-the switch is found at the rear and has two positions, one McIntosh MA-6100 Preamp-Amplifier for 8 to 16 ohms and the other for 4 ohms. There are four AC convenience outlets for powering other equipment; of these one is always "hot" and three are controlled by the unit's main power switch.
Nothing seems to have been overlooked in the way of front-panel controls. Bass and treble controls are dual-concentric types that permit separate adjustment on each channel. The channel balance control shares a dual-concentric arrangement with the loudness compensation control which itself also has a "presence" position. Power off/on is combined with the master volume control.
The input selector has six positions to correspond to the input sources connected at the rear. The mode selector offers an unusually broad range of possibilities: left input to left and right outputs; right input to left and right outputs; reverse stereo; normal stereo; mono (left plus right); left plus right to left output only; left plus right to right output only. While the average home listener probably will find little or no need for such versatility, the advanced hobbyist or semi-pro will appreciate the options they represent for special purposes, not to mention their serving as a built-in trouble-shooting tool to help isolate problems to source, amp or speakers.
In addition to these knob-controls is a series of push- buttons. Two control the tape-monitor function for the two recorders that may be connected at the rear. Two more facilitate tape-copying in an easy and ingenious way: the Tl-to-T2 button connects the output jacks from tape recorder no. 1 to the input jacks of tape recorder no. 2 without affecting the program being monitored over the speakers. In this position, a copy of the program being played on tape recorder no. 1 can be made on tape recorder no. 2. To monitor this copy, you simply press the Tape 1 monitor switch. The T2-to-Tl button does the same thing the other way round, permitting a copy of the material on tape recorder no. 2 to be made directly on tape recorder no. 1. This time, to monitor the copy, you would press the Tape 2 monitor button.
In addition, there are two more buttons for low and high frequency filters, and yet another for phase reversal-this last is another feature once found on many control panels and for some years not offered on most amplifiers or preamps. Needless to say, the phase switch not only is useful in initially setting up stereo speakers but it can provide a check on the proper phasing of stereo by program material. It also comes in handy when adding a rear-channel amplifier and speakers to an existing stereo set-up to convert to quadraphonic sound. Proper phasing of all four speakers is germane to the full quadraphonic effect generally; in matrix de- coding, it is especially important that all four channels remain in phase.
The speaker selector buttons and the stereo head- phone jack complete the picture at the front. The panel itself is neat enough to fit into any home decor and is "business-like" enough to fit into the more workaday environment of a studio. Somehow, "Mac" stylists have managed to design a look that may well appeal to both types of user, and this opinion dovetails with the unit's general feel as a product.
Test Results
Because of McIntosh's reputation, and because this company offers a money-back guarantee that its products will meet or exceed published performance specs, MR raised its critical eyebrow when the first sample of this amplifier, which had been obtained off a dealer's shelf, fell somewhat short of making 70 watts in one output channel.
We tested two MA 6100’ from a dealers shelf. As to the new, normally functioning samples, both produced better than 85 watts per channel (McIntosh claims 70). Power bandwidth extended from 14 Hz to 35,500 Hz in one, from 13 Hz to 35,000 Hz in the other (McIntosh claims 20 to 20,000 Hz). For McIntosh's claim of 0.2% harmonic distortion, we measured in either sample the extremely low level of 0.03% har- monic distortion.
And that's the way it went through all our tests of both the power amp section and the preamp section which, by the way, has very accurate RIAA equalization and excellent overload signal characteristics combined with a very low noise level-exactly what you look for in a preamp. Control and filter characteristics all were fine and well suited to their intended use; signal t m sensitivities and output levels were well within the normal range for easy mating with other equipment of contemporary design. All controls and switches per- formed with professional smoothness to lend the unit a “quality feel" which was substantiated by our lab tests and further borne out when we opened the beast and studied the extra-careful layout of quality parts that make up its innards and circuitry. All told, MR's view of the MA-6100 is that it is a superb integrated amplifier that should interest a wide range of users.
SPECIFICATIONS
- Power output: 70 watts per channel into 8Ω (stereo)
- Frequency response: 20Hz to 20kHz
- Total harmonic distortion: 0.2%
- Damping factor: 50
- Input sensitivity: 2.5mV (MM), 300mV (line)
- Signal to noise ratio: 76dB (MM), 90dB (line)
- Output: 300mV (line)
- Speaker load impedance: 4Ω to 16Ω
- Semiconductors: 36 x transistors, 22 x diodes, 2 x TRIAC
- Dimensions: 406 x 138 x 330mm
- Weight: 15.4kg
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