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.

Lights On Reminder (CB4784E)
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...
5 W Darlington Amplifier (CB6177E)
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...
Volume limiter (CB25287E)
This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit...