6VDC Amplifier (T485E)

This drum amplifier was found in an American documentation from 1947. It makes use of a mechanical vibrator to generate high voltage for the tubes.

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RF probe (CB21194E)
Found in a publication for radio amateurs from the 1990s, this circuit makes it possible to...
Sequential 4017 and Neon Lamp (CB10508E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
3 to 12 MHz Receiver (CB18520E)
This simple transistorized receiver with earphone was found in a Japanese publication from the...