Low noise amplifier (T466E)

Found in 1948 MIT documentation, this 4-tube amplifier is characterized by its low noise level.

Communications Receivers BFO (CB18292E)
The BFO or Beat Frequency Oscillator is used to receive telegraphic signals or even modulated in...
200 mW Amplifier (CB21672E)
This amplifier was taken from documentation from the 1960s. Transistors are germanium types from...
1.4 kHz Double T Filter Passes Range with the 741 (CB1455E)
This circuit was found in a 1977 Radio Shack documentation. The circuit is tuned to 1.4 kHz, but...