12-02-2017, 08:27 PM
Hi and welcome,
Just a few thoughts. Does your sensitivity adjustment have a fiber nut or a brass one? Should have a fiber one. Check the grid leak resistor for the det circuit, may be high in value. I've found it easier the drill the three rivets out and remove the coil shields as a unit rather than unsoldering the coil and dropping it out the bottom to change it out. You can measure it by checking the resistance from the grid cap to the chassis, the sm caps and coil look like a short by comparison to the 4M resistor.
Double check your resistors around the det to be sure you have the right ones in the right places.
Are you using a signal generator to align the IF stage? If you are trying to do it by ear it's difficult to get it right and it's fairly critical.
You can try making the sensitivity adjustment w/o the ant or signal generator connected. A very strong signal may overload the det.
GL
Just a few thoughts. Does your sensitivity adjustment have a fiber nut or a brass one? Should have a fiber one. Check the grid leak resistor for the det circuit, may be high in value. I've found it easier the drill the three rivets out and remove the coil shields as a unit rather than unsoldering the coil and dropping it out the bottom to change it out. You can measure it by checking the resistance from the grid cap to the chassis, the sm caps and coil look like a short by comparison to the 4M resistor.
Double check your resistors around the det to be sure you have the right ones in the right places.
Are you using a signal generator to align the IF stage? If you are trying to do it by ear it's difficult to get it right and it's fairly critical.
You can try making the sensitivity adjustment w/o the ant or signal generator connected. A very strong signal may overload the det.
GL
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
