6SN7 Preamplifier (T1105E)

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

Phase sequence detector (CB8298E)
Found in an Electronic Design from the 80's, this circuit monitors a three-phase line, activating a...
Unit Gain Stage (CB6157E)
This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms...
250W Amplifier (CB24275E)
This powerful high-fidelity amplifier was described in an article in Radio Electronics magazine in...