3-tube receiver 2 (T1603E)

Using known tubes, this receiver was found in a Radio Electronics from 1949. The circuit does not include the power supply.

Positive Ramp Generator (CB13450E)
This circuit was obtained in an old American documentation, remembering that the 566 is the double...
Telephone Line Simulator (CB17467E)
With this simple circuit it is possible to simulate a telephone line for carrying out repairs on...
Soldering Central (CB16386E)
This simple circuit was found in a 1981 publication. As readers can see, we have an H switch and...