This amplifier, whose mounting on a printed circuit board was described in Radio Electronics of October 1960, has 35 W of power. The power supply uses a transformer and a set of 5 tubes.
The circuit shown was found in the 1994 National Semiconductor's Linear Application Handbook. The...
Phase and amplitude can be controlled in this circuit found in the May 1988 Radio Electronics...
This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent...