What does the dial say. ? Stations or wavelength ?- That often gives a clue about date and country of origin. Is there a wave-band change switch? The two symetrical pins are the heater; that spaced o
Dear Mal and All, a hint about your PORTADYNE: Let us say, the offset pin of the base is 1, and the others - clockwise - 2,3,4. The distance pin1 / 2 is 13mm, 2 / 3 is 10mm, 3 / 4 is 10mm, 4 / 1 is 1
You should be able to make out the circuit just by looking at the underside of chassis. I thought all G3's could draw the circuit of a simple 4 valve TRF rx from memory and first principles having bu