Audio control unit (T377E)

This multi-input tone control and preamplifier was found in the 1961 RCA tube manual. The circuit is recommended for high-fidelity tube amplifiers.

High Gain Amplifier (CB4250E)
This high gain small signal amplifier circuit was found in an old publication on transistors....
Third Brake Light (CB4783E)
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
APR345 Rectification Synchro Controller (COM114E)
September 2016 - It can be purchased from Mouser Electronics the new rectification controllers...