Tag Archives: Class A amplifier

Class-A Amplifiers and the Krell KSA-150

Many readers will be aware of how much I love Krell audio gear and their class-A designs. The Krell KSA-150 Class A Power Amplifier is a great example of one of these hot, power-hungry designs. In this article, I discuss the very basics of class-A amplifiers, with service details and images of the gorgeous KSA-150!

You may have already watched my restoration video, where I completely refurbish one of these beasts.… Read more

Krell KSA-200S Class-A Amplifier Repair and Restoration

I am about to embark on a Krell KSA-200S Class-A Amplifier Repair and Restoration, in this case for a very good friend of mine.   

As many of you will know, the Krell KSA-200S is a beast of an amplifier, up there with the very best products Krell ever made. It is almost unliftable by one person, being hewn from solid slabs of steel and aluminium.… Read more

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.… Read more