Low noise amplifier (T466E)

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

1 W amplifier with the LM390 (CB13753E)
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
Wiretapping Amplifier (CB19339E)
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...
3 to10 MHz Oscillator (CB13020E)
The modified Hartley oscillator seen in the figure can generate signals ranging from 3 MHz to 10...