4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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Voltage doubler power supply (CB8166E)
Using a 12 V transformer, this unit can provide a much higher output voltage. The circuit is from a 90’s...
Precision analog multiplier (CB7393E)
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....
Multi-pulse trigger (CB21477E)
This circuit was found in a 1967 EEE. The transistors are from the time and can be tested...