I have now upgraded a number of APT power amplifiers, which like their pre amplifier compatriots represent exceptional value.


A set of APT power amps and APT pre amp- the power amps are configured as mono blocks and all have the optional rack mount front panels

There is a detailed description of the upgrades in the blog section, however in summary:

  • New power supply capacitors and relay- excluding main PS caps
  • New electrolytic caps throughout power amp boards and replacement of ceramic caps with WIMA film types
  • Replacement of IC’s and certain resistors with new low noise types



Undergoing upgrades- one channel nearly done