Post by elorens on Apr 26, 2022 9:40:54 GMT 12
I have an early Genalex console, probably dating from about 1932, which I’m trying to identify. There is a number 100-921 stamped on the chassis, and a plate gives the valve lineup as 224,235,227,224,247, and 280. One clue is that the 235 tetrode first appeared in March 1931. A difficulty is that in 1932 Genalex produced a large number of models, both TRF and superhets, and a lot of these were consoles.
The set doesn’t currently work and I don’t have a circuit diagram. It would help if I could clearly identify it as either TRF or superhet. You’d think that would be straightforward, but no! Someone suggested looking for IF cans. But another radio I have which definitely IS a TRF, has the coils in round metal cans, with connections to top caps etc. So my question is, can anyone identify a sure way of telling if a radio is TRF or superhet? My best effort so far is to try to detect the signal from the local oscillator, but in this case that has obvious limitations. I know, in the end I can trace out the circuit, but I’m hoping for a smarter approach. Maybe the valve lineup carries a clue? Thanks for any insights! Lawrence
The set doesn’t currently work and I don’t have a circuit diagram. It would help if I could clearly identify it as either TRF or superhet. You’d think that would be straightforward, but no! Someone suggested looking for IF cans. But another radio I have which definitely IS a TRF, has the coils in round metal cans, with connections to top caps etc. So my question is, can anyone identify a sure way of telling if a radio is TRF or superhet? My best effort so far is to try to detect the signal from the local oscillator, but in this case that has obvious limitations. I know, in the end I can trace out the circuit, but I’m hoping for a smarter approach. Maybe the valve lineup carries a clue? Thanks for any insights! Lawrence
