Explorer for all ranges (T1098E)

This circuit was found in a Radio Craft from October 1946. Power supply not shown, and tubes are 1.5V filament types.

Error Amplifier and Trigger Generator (CB19981E)
This circuit was found in old documentation. The components can be replaced by modern ones. The...
Active Tone Control (CB18728E)
This transistor circuit consists of a well-known bass and treble control configuration. The...
Fast Photo Darlington (CB14647E)
With the circuit shown, you can have a fast response with a Darlington configuration. The circuit is...