[planigan]

Johnny, if you have the manual for your signal tracer it should explain the procedure. I'll try to give you a basic idea. When you placed your probe on the 1st IF Det and got music, what happened is the probe was acting as an antenna and sending the signal from that strong local station to the next stage in the radio and all the way to the speaker (you heard the music). Actually what you inadvertantly did is signal trace using that strong local station. You put it in at the plate and it went through to the speaker. This would indicate that the oscillator is working as well as the IF and audio section of the radio. You actually lucked out in having that strong a station nearby.It was the same as if you used your signal generator to actively inject a the signal at that point. What it did also point out is your RF section is not functioning correctly. It should be picking up that station, amplifying the signal and sending it to the grid of the 1st Det. The RF section is supposed to select a particular signal frequency, amplify it and send it onto the next stage. This is why your turning of the tuning condensor did not vary the station you received because it affects the RF section and no effect on later stages (that's not entirely true but for the present keep it simple). To check the RF section using your signal generator you would select a freguency, add the internal modulation and set the output voltage. You then apply that to your atenna input. Going by the schematic for the set you would then trace the signal to the first component and see if its there (usually antenna transformer). As an aside, if you did not have the signal generator with a high output voltage you would not get enough voltage from that local station to be able to read it (low millivolts). Then you would go to the secondary of the antenna transformer, see if you are getting the signal there (and at a slightly higher voltage) and continue on to the grid of the 1st Det tube. Some where along the line you are going to lose the signal and now you have narrowed down the problem area. Fixing the problem is another chapter but the above is the bare bones outline of what you would be doing. PL