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.

Gain Circuit for LM3900 (CB25167E)
This circuit was found in an article in the December 1988 Radio Electronics magazine. The circuit has...
Direction & Speed Control (CB5370E)
This series motor control circuit was obtained from an old manual from the 80's. The SCRs must be...
Logic Trigger (CB6602E)
The purpose of this 1967 Philips circuit is to produce a rectangular signal from a sharp pulse....