Multi band receiver (T919E)

This mains powered 1-valve multi-band receiver was found in documentation from January 1945. Coil taps select the tuning range.

Transistor Tester (CB4370E)
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
Test Circuit for Inductor (MSB005E)
The arranjment sohon Bellow, and simulated in the Multisim Blue allows to see in the oscloscope...
3 Channel Transistor Mixer (CB1289E)
We found this circuit in a European publication of the 1980s. The transistor could be the BC549. The...