Fast Heating 15W Amplifier (T487E)

We found this circuit in an American documentation from 1947. The circuit uses 5 tubes and has a feature to keep the tube filaments preheated.

| Clique na imagem para ampliar |

Magnetic Head Amplifier (CB10873E)
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
Tape Driver (CB4669E)
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
3-decade logarithmic AD (CB9024E)
This circuit was found in a 70s American documentation. The converter can be of any type and the...