Krell KSA-150 Amplifier Repair & Restoration

This video documents my comprehensive overhaul and restoration of a gorgeous Krell KSA-150 class-A power amplifier.

This wonderful KSA-150 developed a serious fault at some point in the past. This had been quickly fixed and was sold to me in very poorly repaired condition. Because of this, I decided to completely overhaul the amplifier and restore it back to factory condition, using original spec or better parts.

The nature of the overhaul meant that I had to completely dissect the amp. I removed all output devices and re-heatsinked them using new silicone thermal washers. I replaced almost all the capacitors. Finally, I replaced all emitter resistors and spaced them up off the board as Krell later did in these models.

Watch the video below to find out all the details and you can find more about the Krell KSA-150 and class-A operation here.


Liquid Mike

As a kid, I cherished my Tandy 200-in-1 electronics project lab and Dick Smith Funway electronics kits. I had my own little hi-fi at 16. Later, I started Liquid Audio, a specialist hi-fi equipment repair business. Keeping classic hi-fi gear alive and well is what we do. Our mission: to deliver TLC for classic Japanese, American and European hi-fi stereo equipment. In my spare time, I cook, ride, listen to music and research interesting topics.

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