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.

500 to 5000 Hz Astable 4001 (CB16313E)
To obtain variable frequency signals, the circuit in the figure is recommended. In this circuit, the...
Cells and Batteries Test (CB22141E)
This circuit was found in old English documentation. It can be improved by using resistors of...
Touch Volume Control (CB10566E)
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...