12W Amplifier (T493E)

This amplifier for playback of recordings was found in a 1947 manual. It uses a push-pull output with a tube power supply.

| Clique na imagem para ampliar |

Voltmeter without indicator (CB7348E)
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...
Amplifier Stage OC71 (CB14750E
) The circuit in the figure uses an old OC71 germanium transistor. Performance depends on...
JFET dip meter (CB5176E)
We find this circuit in an American documentation from the 80's. The circuit has the coil given by the...