Amplifier stage with the T411E (T411E)

The pentode tube used in this circuit has 1.5 V filament. The circuit is a voltage amplifier with the 1U5 tube.

Antenna Tuner (CB21637E)
The purpose of this circuit is to improve the reception of signals from the short-wave band. The...
Light detector (CB8338E)
This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit...
Wireless Headset Transmitter (CB20970E)
This circuit was found in a Popular Electronics from the 90's. The CMOS integrated circuit used is...