Low noise amplifier (T466E)

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

Touch Shield (CB19557E)
This circuit also makes use of a field effect transistor (JFET) which can be the BF245 and has an...
Experimental Oscillator (CB23649E)
This Hartley oscillator can be used in tests or as a signal injector. The transformer is the type...
Three-Channel Sequential (CB12302E)
This circuit is from a 1981 publication. The DC supply can be made with voltages from 6 to 12 V...