07-08-2016, 03:30 PM
Well, still struggling. Thing is, cannot devote real time right now to it, the house full of people and so things keep popping up, like helping making a frame for the picture that they brought or ...or....so haven't really been able to crack this one yet.
I realized the IF signal gets suppressed by the first tuned circuit. An RF signal that corresponds to the dial position does get through. But not very strong. Whereas the IF signal applied to the 6A7 grid does get through very loudly. No stations. Yet.
Voltages seem fine.
The antenna and the second RF transformer (the RF 78 load) seem fine, at least continuity-wise.
So, will have to start looking at values (all replaced, caps and resistors); I do not think this is the AVC misbehaving (I did add that 1K resistor in parallel to the shadow meter bypass to emulate the shadow meter that I have not put in yet) but will check it. All tubes are fine, and the 78 RF has been replaced, and re-checked........
I realized the IF signal gets suppressed by the first tuned circuit. An RF signal that corresponds to the dial position does get through. But not very strong. Whereas the IF signal applied to the 6A7 grid does get through very loudly. No stations. Yet.
Voltages seem fine.
The antenna and the second RF transformer (the RF 78 load) seem fine, at least continuity-wise.
So, will have to start looking at values (all replaced, caps and resistors); I do not think this is the AVC misbehaving (I did add that 1K resistor in parallel to the shadow meter bypass to emulate the shadow meter that I have not put in yet) but will check it. All tubes are fine, and the 78 RF has been replaced, and re-checked........
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
