Category Archives: Amplifiers

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

´╗┐Quad 405 Power Amplifier Service & Refresh

Visitors to my site will already know how much I like the Quad 405. A recent conversation with a customer inspired him to acquire some Quad gear, including this lovely, original 405. In this article, I cover servicing a Quad 405, the Liquid Audio way.

Talk about great sounding amps, and this particular 405 is completely original, with its original capacitors and connectors.… Read more

Accuphase M-60 Power Amplifiers Repair & Restoration

I recently repaired and completely restored two stunning Accuphase M-60 monophonic power amplifiers. Read on to learn how these wonderful amplifiers were ruined by a local Perth electronics repairer, before they came to me.

The Accuphase M-60 is a monophonic power amplifier. It was top of the Accuphase range when introduced in 1975 and capable of driving almost anything.… Read more

Sansui BA-F1 Power Amplifier Restoration Update

I’ve now finished restoring a lovely Sansui BA-F1 DC power amplifier. The Sansui BA-F1 is another beast of an amplifier from the golden era of hi-fi.

This Sansui BA-F1 has had a hard life, but will be good as new, once I’ve finished this restoration. I’m replacing all board-mounted capacitors, along with a few semiconductors. I am also cleaning and tidying up wiring and board goofs made by whoever repaired this previously.… Read more

Yamaha MX-1 Statement Power Amplifier Repair

I’ve just finished a repair on an amazing power amplifier – the Yamaha MX-1. You can skip to the video now, or read on for more details…

The Yamaha MX-1 was the best and most expensive amplifier in the Yamaha line-up for 1993. I truly had to wrestle this thing around the workshop, it’s so heavy for its size, it feels like it’s made of lead!… Read more

Classic Quad 405 Power Amplifier Restoration

I recently purchased a classic Quad 405 power amplifier to use as my main stereo amp. It sounded fantastic even before my overhaul, read on for the gory details and, for some extra reading, check out my Quad 405-2 review.

The Quad 405 is revered by many real hi-fi nuts, even 40 years after its release.… Read more

Marantz PM-8 Esotec Integrated Amplifier Repair & Restoration

I’ve been very busy repairing and restoring this stunning Marantz PM-8 integrated amplifier. In my opinion, this is one of the best integrated amplifiers from the golden era of the 70’s and 80’s.

More photos and details of the Marantz PM-8 restoration soon. You can find my article about the exploded filter capacitors, here!

In the meantime, here’s a video summary of the testing and setup of bias, DC offset and power supply voltage.… Read more

Rogue Audio Sphinx Integrated Amplifier Repair

I recently repaired this Rogue Audio Sphinx hybrid valve / class-D integrated amplifier. The repair also reminded me of a valuable lesson in always checking the obvious!

The Rogue Audio Sphinx is a nicely made amplifier, hand-built in the USA which is a very good thing. The amplifier features an unusual topology, consisting of a tube preamplifier, solid state power supply, support circuitry and two Hypex class-D output amplifier modules.… Read more