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 its made of lead!… Read more
Lovely little preamp the Audiolab 8000Q. It’s really only let down by poor quality factory-fitted parts, particularly the capacitors.
This 8000Q came to me with a fault which would see it sometimes take a really long time to turn on. It would sometimes take up to 30 minutes to become operational after turn-on.
In this case, I found one definite and one possible fault.… Read more
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
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
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