Krell KMA-160 Monoblock Amplifiers, PURE Class A Power

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Early and desirable Class A amplifiers from Krell.

Fitted with huge unique looking heat sinks to dissipate heat and ensure longevity.

Capable of driving even the most complex speaker loads with tons of punch and authority.

We serviced one of the units in-house, while the other appears to have been serviced elsewhere.

Both are working brilliantly.

Connection Notes:
We believe that this set of monoblock amplifiers might have originally been configured as KSA-80's. They do not have the typical XLR connector seen on KMA-160's. Each amp operates in a balanced configuration using two RCA connections. One inverting, one non inverting. We've custom-made a set of XLR dongles to help interface the amplifier with typical XLR cabling. 

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Speaker Cables

Kimber Kable - Bi-Wire Speaker Cables

Kimber Kable - 14AWG (Gauge) Power Cords - Better

Kimber Kable - 10AWG (Gauge) Power Cords - Best

The SkyFi Testing Process for Solid State 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.

Krell KMA-160 Monoblock Amplifiers, PURE Class A Power - Manual

Specifications - PER Amplifier
Power:
160 watts into 8Ω

Frequency Response:
20 Hz to 20 kHz

Total Harmonic Distortion:
0.1%

Damping Factor:
800

Input Sensitivity:
1V

Signal To Noise Ratio:
120 dB

Speaker Load Impedance:
1Ω (minimum)

Dimensions:
9" x 23-1/4" x 21-1/8"

Weight:
75 lbs