Identifican request - 3 Valve mains superhet

[pwdrive]

Possibly not, but tests like this have often been of the greatest use to me.   For instance, if one LC circuit was considerably different to the others, that would indicate a fault.    In any case, I do not believe there is anything wrong with the IF cans - there are plenty other dodgy areas to investigate before them.
Bob

Yes, I can understand that but IF transformers are relatively high Q, if one tuned circuit is a few kHz out with respect to the other then performance will suffer, best non intrusive way to check is to sweep the sig gen through and note the frequency it peaks at, if the cores haven't been tweeked then the chances are that all's well but that's not to say that the tuning capacitors or inductors don't go faulty, they some times can but not very often.

Lawrence.