Krell KSA-100 MK-2 - Class A - Stereo Solid State Amplifier

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Out of all the different looks produced by Krell over the years - this is by FAR our favorite.

Including how this amplifier is finished in a very unique brushed metal finish with gold screws and matching name plate.

This 100W Class A beast is capable of producing enough current to power just about anything.  Driving your complicated speaker load will be a breeze.

It clearly has been well cared for over the years and came to us from a collection that had hundreds of pieces - but they didn’t see much, if any use during all that time.

Inspection and testing yielded great results.  We ran this monster at its full rated power for quite a bit of time to ensure that it will perform to specification and reliably.  The heatsinks dissipated heat without issue, and the signal output was clean all the way through.

In our listening room it powered our difficult to drive Apogee speakers without breaking a sweat.

Condition is very good with only one noticeable scratch on the top back right. There are no dings or corrosion of any kind.

Our Testing Process for Amplifiers (Solid State) at SkyFi:

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 KSA-100
Class-A Stereo Solid State Power Amplifier

Years Available for Purchase:
1981 - 1987

Class-A Power:
•  100 Watts at 8 Ohms
•  200 Watts at 4 Ohms
•  400 Watts at 2 Ohms
•  800 Watts at 1 Ohm
•  1200 Watts at 0.5 Ohm (!!)

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