08-21-2009, 11:32 AM
HI Bill,
Thanks, Yes, it could be different issues here, so I was going to verify this coil was correct, then move ahead.Using a loupe magnifier, I can see where thinner wire was wound on the temonals wth the thick wire.
As far as the alignment, I have tried just about everything. Slight offtune the IF, and detune the trimmers. At one point, I had it tuning almos the entire band, but then tuning the high end I'd reach about 200 then the squeal would happen. I have followed the alignment to the "T"to get back on track.
I have heard that some have had to hand pick a #36 tube because of issues. I only have 2 tubes to work with but they test on the high side.
Seems odd but If I removed the OSC grid cap, the set would receive (weakly) across the whole band. I tried placing a .01 cap in series with the cap, and it did pick up ok, but there was a very slow oscillation depending on the size of the cap.
I have gone over the circuit again, and everything seems in place, but I think somehow a signal is getting back to the OSC tube and overloading something. I"m not good at working with coils as far as troubleshooting. I have looked at lead dress, moving wires, etc, no change.
The voltages also seem ok when it's receiving. It is pretty sensitive when it does receive.
I know Ron's probably busy, but I am going to keep this coil out until I can find what this winding should consist of.
Well, I'll check back later and I'll see if I can find the ARF thread you are talking about.
Take care,
Gary.
Thanks, Yes, it could be different issues here, so I was going to verify this coil was correct, then move ahead.Using a loupe magnifier, I can see where thinner wire was wound on the temonals wth the thick wire.
As far as the alignment, I have tried just about everything. Slight offtune the IF, and detune the trimmers. At one point, I had it tuning almos the entire band, but then tuning the high end I'd reach about 200 then the squeal would happen. I have followed the alignment to the "T"to get back on track.
I have heard that some have had to hand pick a #36 tube because of issues. I only have 2 tubes to work with but they test on the high side.
Seems odd but If I removed the OSC grid cap, the set would receive (weakly) across the whole band. I tried placing a .01 cap in series with the cap, and it did pick up ok, but there was a very slow oscillation depending on the size of the cap.
I have gone over the circuit again, and everything seems in place, but I think somehow a signal is getting back to the OSC tube and overloading something. I"m not good at working with coils as far as troubleshooting. I have looked at lead dress, moving wires, etc, no change.
The voltages also seem ok when it's receiving. It is pretty sensitive when it does receive.
I know Ron's probably busy, but I am going to keep this coil out until I can find what this winding should consist of.
Well, I'll check back later and I'll see if I can find the ARF thread you are talking about.
Take care,
Gary.