1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

Solar Telegraphic Transmitter (CB4054E)
This telegraph microtransmitter for a frequency determined by the coil and the crystal was found...
6 or 12 V Sequencer Using a SCR (CB479)
Using this circuit the lamps glow in sequence in a speed given by the capacitors. The SCRs present a...
SCR Astable (CB6804E)
This circuit was suggested by a 1967 General Electric manual. The waveforms of the generated...