6W HiFi Amplifier (T480E)

This 4-tube amplifier with 6W of output was found in an American manual from 1947. The sound quality is excellent.

| Clique na imagem para ampliar |

High impedance transistorized stage (CB7468E)
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...
Current sensor with 100 M ohm input (CB9663E)
This sensor circuit for currents of the order of nanoamperes was found in an American...
Transistor Tester (CB10768E)
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...