Category Archives: Amplifiers

Articles about amplifiers, including power amplifiers, integrated amplifiers, big and small amplifiers, solid-state and tube amplifiers!

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

Music Angel Class-A 845 Tube Amplifier for Sale

Liquid Audio is very pleased to offer this glorious Music Angel Class-A 845 tube amplifier for sale, in brand new condition, with all original boxes and packaging! UPDATE – SOLD!!

The Music Angel Class-A 845 is a beast. This is 28kg of pure Class-A, single-ended triode (SET) tube amplifier that sounds nothing like any solid state amplifier you’ve ever heard!… Read more

Arcam Alpha 9 Integrated and Power Amplifier Service

Arcam makes some nice gear and when a customer asked me to service his dual Arcam Alpha 9 integrated / power setup, I was happy to assist.

The Arcam Alpha 9 amplifier was a mainstay for Arcam for many years. The amplifier is fairly straightforward in design and neat in internal layout. There is nothing really serious about this gear, it is modestly designed and constructed, but well-made if that makes sense.… 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