Category Archives: Repairs

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

Dead Filter Capacitors, Marantz PM-8 Restoration

Just a short post here while I am in the middle of repairing / restoring an absolutely massive Marantz PM-8 integrated amplifier.

These main filter capacitors sit in the power supply and do all the ‘heavy lifting’ required to make the power supply smooth and quiet. All four 15,000uF capacitors have literally spewed their contents all over the insides of this beautiful amplifier.… Read more

BAT VK-500 MOSFET Monster Amplifier Repair

A regular customer of mine had an issue with one of the binding posts of his amazing Balanced Audio Technology VK-500 MOSFET amplifier. I fixed it for him, read about the repair below.

Technically speaking, the BAT VK-500 MOSFET amplifier is an amazing design. It uses all MOSFET devices in the driver and output stages. It features 24 N-channel MOSFET devices in the output stage, avoiding the inherent complementary pair mis-matching problem.… Read more

Yamaha CA-610 and CA-710 Integrated Amplifier Service & Repair

Recently, two friends with lovely vintage Yamaha CA-610 and CA-710 integrated amplifiers sought my assistance to have them repaired. One was dead, the other was not working well.

The Yamaha CA-710 had blown one channel. One of the original output devices, a Sanken 2SA745, had a collector to base short and it had taken out one of the driver transistors.… Read more

JVC JL-F45 Direct-Drive Turntable Service and Repair

I’ve just finished servicing yet another direct drive deck I’d never seen before – a JVC JL-F45 – what a cool machine!

I was quite surprised by the weight and overall build quality of this lovely JVC direct-drive turntable. The JL-F45 is a fully automatic direct-drive deck. For those who don’t know, fully automatic means that the tonearm is controlled by the turntable, not by you.… Read more

Pioneer PL-A35 Belt-Drive Turntable Repair

The Pioneer PL-A35 is one of those rare belt-driven Japanese decks that you don’t see very often. I’ve repaired a number of such unusual decks in the last 12 months or so, but this is definitely one of the nicest and in some ways, the most unusual.

According to Pioneer: “The PL-A35 combines studio-quality performance with the operational ease of a fully automatic!… Read more