Modulator Amplifier (V1574E)

This circuit is from a 1938 tube manual. Transformers are the critical components. Component values are given.

Zero test (CB22304E)
This circuit, bridge type, was found in American documentation from the 60's. The transistor is...
100 W x 60 W Sine Wave Inverter (CB13912E)
This inverter is critical for transformers and can use modern equivalent transistors like MJ2955 on...
Power Supply for Transistorized Circuits (CB18862E)
This low-current power supply was obtained in Japanese documentation from 1968. The currents are...