We have many tube tester circuits in this section. This one came out on a Radio Electronics from 1949 and has a very elaborate configuration with toggle switches.
This 80s signal follower makes use of an audio amplifier of the era. The circuit can be adapted to...
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...
This transmitter operates in the FM band emitting beeps that can be picked up on a common radio at...