Category Archives: Amplifiers

Articles about amplifiers, big and small, solid-state and tube.

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

The Redgum RGi120 Integrated Amplifier – Australian Quality? You Decide…

This piece, about the Redgum RGi120 integrated amplifier, isn’t one I enjoyed writing. Redgum is an Australian brand and I really wanted to be able to write great things about the design and construction of this amplifier.

In the end, I couldn’t. I wrote this piece, considered not posting it, then hit go, only to pull it down after I was literally inundated with hits!… Read more

The Sansui Corrosive Glue Problem

The infamous Sansui corrosive glue problem is one that affects many vintage hi-fi amplifiers and other equipment. Resolving issues caused by this glue is time-consuming, but essential.

You maybe familiar with the scenario – over time, your favourite Sansui (or other) amplifier starts to develop faults. Maybe it won’t come out of protection, or maybe a channel becomes intermittent.… Read more

Sansui AU-717 Integrated Amplifier Repair & Restoration

I recently restored a gorgeous Sansui AU-717 integrated amplifier. This AU-717 was not running properly and was in serious need of some TLC.

The Sansui AU-717 integrated amplifier is one of those pieces that I just love working on. Sansui designed and built the AU-717 at a time when labour was cheaper. Money went into build quality, parts and layout.… Read more

Kenwood L-1000 Series – Exceptional Audio Components

I was recently asked by a customer to service and repair two of his gorgeous Kenwood L-1000 series components. In the lab this time were an L-1000T tuner and matching L-1000D compact disc player. All I can is wow! This gear is seriously well put-together and just beautifully engineered.

In what was a great result, I successfully repaired both units.… Read more

Krell KSA-150 Class-A Power Amplifier Restoration

A couple of years back I performed a comprehensive tear-down, overhaul and upgrade of my gorgeous Krell KSA-150 power amplifier. I made a video of it, which you are most welcome to check out.

There’s not much you can buy that can touch the performance of a class A amplifier of this quality – let’s face it – the Krell KSA-150 was ten grand – in the early 90’s!… Read more