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.

Two Channel Lamp Flasher (CB16320E)
The flasher we present was found in a 1982 publication, shown in the figure. What we have is a...
Simplified 2-bit decoder 7400 (CB22422E)
This is the previous version, but with a simplification given by the use of the 7404 and 7408...
Very Slow Astable (CB19410E)
We found this circuit in a publication from the 1980s. Transistors are high voltage types of the...