10W Amplifier with 6 tuber (T492E)

We found this 6-tube amplifier in a 1947 publication. It is a Public Address amplifier with excellent performance using triodes on the output.

| Clique na imagem para ampliar |

Reflected Power Adapter and Monitor CW (CB3884E)
We found this circuit in an old American documentation for hams. The circuit serves as a telegraph...
High gain UJT (CB8151E)
This General Electric circuit, in a documentation from the 1960s, allows the use of high...
20 V adjustable power supply (CB8167E)
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...