Power source for tubes (T384E)

This experimental bench source was found in a modern book on tubes. The components used can be easily obtained.

10 to 100 seconds time switch (CB20371E)
This circuit was obtained in a documentation from the 1970s. What it does is to delay trigger a...
Transistor gain test (CB20733E)
With this circuit it is possible to make the selection of transistors and their test according to the...
TTL Memory 7400 (CB22412E)
This memory flip-flop must be powered by 5V voltage. The circuit stores 1 bit. ...