This interesting 1924 triode tube receiver was found in a documentation by Gernsback. Observe supply voltages. Coils are for tuned wavebands.
This power control circuit was found in an article in the June 1995 Electronis Now magazine. The...
This circuit for vehicular use is from an 80's American publication. The circuit has a light...
This circuit can be used with 3 receivers and is intended for low frequencies (medium wave range). We...