6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

Micro Amplifier (CB508)
This circuit uses an audio output transformer found in old transistor radios. Power output is...
Telephone amplifier (CB9400E)
This circuit was found I a 1965 Radio Schack documentation. The transistors are from that time,...
Distribution Amplifier (CB19012E)
This amplifier for distributing audio signals appears in other articles on this website and even...