Tag Archives: amplifier repair

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

Pioneer SX-1250 Replacement Power Supply Capacitors

Now these Pioneer SX-1250 Replacement Power Supply Capacitors are serious capacitors!

The Nippon Chemi-Con parts have just arrived from my supplier and I’m now ready to restore the power supply of the big Pioneer SX-1250 ‘monster receiver’. Read about this complete restoration here.

These capacitors have a greater capacitance than the original parts. They will provide the benefits of greater energy storage, tighter bass and better impulse performance.… Read more

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