ACTRK400 / 600

This amplifier is the result of input by many people.  Inspired originally by a close friend and with my joint collaboration several versions were built in the 1990's.  Developed from an original Siemens early design changes included cascode first and second stages, auxiliary drive rails plus other circuit and component changes to ensure stability.  When first introduced at DIY Audio in March 2005, the circuit was further developed with the help of a few dedicated members with the end result being a unique, powerful and flexible design.  

The amplifier can be built to suit a wide range of power needs with a practical limit of about 700 watts into a 4 ohm load.  Higher powers can be achieved with minor changes but this is beyond the scope of my intentions.

The amplifier is ideally suited to high power PA applications.

POWER SUPPLY