This 1.5W tube amplifier was found in an American documentation from 1947. It is a direct rectification circuit without the need for a power transformer.
Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz....
This old slide projector control circuit was found in an 80s Hands On. The circuit uses modern...
This circuit is from Motorola documentation, but can be implemented with virtually any...