McIntosh MA6900 Integrated Amplifier - All Analog! Built In Phono

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This is the last of the real McIntosh analog integrated amps, in gorgeous condition and fully tested.

Unlike modern integrated amplifiers, this unit has what we believe to be two distinct advantages.

For starters, instead of digital encoders it utilizes real potentiometers to manage the volume, balance, and EQ. This is the old school way and how McIntosh built their reputation.

Second, there is no DAC built into this unit. No superfluous, outdated converter, sitting there just making noise and taking up bandwidth from the power supply.

The EQ is a really nice feature to get the most out of your vintage speakers. It even has a built in phono section for connecting basic turntables.

Tried and true McIntosh patented Power Guard helps to keep things from going wrong (and fast) to your speakers due to overdriving/clipping.

The glass is impeccable, and the paintwork is devoid of any scratches or dents.

We'll include a remote and will ship in a double McIntosh made official box guaranteeing safe transport.

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

Specifications

Power Output
Minimum sine wave continuous average power output per channel, all channels operating is:
200 watts into 2 ohm load
200 watts into 4 ohm load
200 watts into 8 ohm load

Rated Power Band
20Hz to 20,000Hz

Total Harmonic Distortion
Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is: 0.005% for 2, 4 or 8 ohm loads

Dynamic Headroom
2.4dB

Frequency Response
+0, -0.5dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz

Sensitivity
Phono, 2.5mV for 2.5V rated output (0.5mV IHF) High Level, 250mV for 2.5V rated output (50mV IHF) Power Amplifier Input, 2.5V for rated output

Signal To Noise Ratio (A Weighted)
90dB (84dB IHF) below 10mV input, Phono Input 100dB (90dB IHF) below rated output, High Level 110dB below rated output,
Power Amplifier

Intermodulation Distortion
Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed twice the rated output, for any combination of frequencies from 20Hz to 20,000Hz, with all channels operating is:
0.005% for 2, 4 or 8 ohm loads

Input Impedance
Phono, 47K ohms, 65pF High Level, 22K ohms

Maximum Input Signal
Phono, 90mV High Level, 8V

Preamplifier Maximum Voltage Output
Phono, 8V at tape output
High Level, 8V at tape output Main Out, 8V at preamp output

Voltage Gain
High Level to Tape: 0dB High Level to Main: 20dB

Wide Band Damping Factor
Greater than 40

Power Requirements
100 Volts, 50/60Hz at 5.2 Amps 110 Volts, 50/60Hz at 4.8 Amps 120 Volts, 50/60Hz at 4.4 Amps 220 Volts, 50/60Hz at 2.45 Amps 230 Volts, 50/60Hz at 2.35 Amps 240 Volts, 50/60Hz at 2.25 Amps
Note: Refer to the rear panel of the MA6900 for the correct voltage.

Overall Dimensions
Front Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches (18.10cm) high. Depth behind front mounting panel is 16- 1/2 inches (41.91cm). Clearance required in front of the Front Panel is 1 inch (2.54cm) for knobs.

Weight
74.5 pounds (33.8 Kg) net, 92.5 pounds (41.7 Kg) in shipping carton

The SkyFi Process for Integrated Amplifiers:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.