11-05-2018, 11:18 AM
I'm in broad agreement with Trevor here and it didn't matter who manufactured the radio, the colours were always the same, I think, pointing towards some kind of standard. However, we didn't see the range of colours on those early sets that we see here!
First off - 13 should be AM Oscillator C (not L) which points to 7 -with its traditional Red core being AM oscillator L.
1, 3, 4 & 5 have two dots in the core whereas the others don't so perhaps it is reasonable to suggest that this differentiates the FM inductors from the AM ones?
In which case, I would go for 6 being the 1st AM IFT, although that conflicts with the Toko list provided by Lawrence which shows a Yellow core as being 2nd AM IFT - but then, we don't have the orange core of the Toko 1st IFT!
Could 4 & 5 be a bandpass coupled pair for FM IF? Certainly both colours appear against 10.7MHz coils in the Toko list, although there is no mention of bandpass anywhere.
2 has no dots so, assuming that it is for AM it would be the 2nd AM IFT/det, although there isn't a match for it in the Toko list and I can't see the detector diode anywhere.
Two diodes next to 1 point to it being the ratio detector in conjunction with 3 but it seems a little odd to stick the AM detector between them and the colours conflict with the Toko list which shows a choice for pink cores - one being for an FM quadrature detector which might fit with that IC hiding under a paper label.
Is it possible to identify the IC, Mike?
That's the best I can do for now - I will be interested to see what others come up with!
First off - 13 should be AM Oscillator C (not L) which points to 7 -with its traditional Red core being AM oscillator L.
1, 3, 4 & 5 have two dots in the core whereas the others don't so perhaps it is reasonable to suggest that this differentiates the FM inductors from the AM ones?
In which case, I would go for 6 being the 1st AM IFT, although that conflicts with the Toko list provided by Lawrence which shows a Yellow core as being 2nd AM IFT - but then, we don't have the orange core of the Toko 1st IFT!
Could 4 & 5 be a bandpass coupled pair for FM IF? Certainly both colours appear against 10.7MHz coils in the Toko list, although there is no mention of bandpass anywhere.
2 has no dots so, assuming that it is for AM it would be the 2nd AM IFT/det, although there isn't a match for it in the Toko list and I can't see the detector diode anywhere.
Two diodes next to 1 point to it being the ratio detector in conjunction with 3 but it seems a little odd to stick the AM detector between them and the colours conflict with the Toko list which shows a choice for pink cores - one being for an FM quadrature detector which might fit with that IC hiding under a paper label.
Is it possible to identify the IC, Mike?
That's the best I can do for now - I will be interested to see what others come up with!
