04-29-2022, 10:53 AM
The local oscillator should be operating at the incoming frequency (the dial frequency) + the IF frequency. At 550kc the osc needs to be at 1020kc. According to the information on the replacement coil w/o the slug in place should put the osc very close to the proper frequency.
Feeding a 500kc signal to it just confuses things as it's too high to be at the IF and too low to be it the bcb. It serves no purpose other than to muddy the waters. Have you aligned the IF stage @ 470kc with an accurate generator?
If so I would I'd check rotor for the end plates being bent in shorting against the stator. Or a weak 6A7.
OBTW You didn't mention terminal 1 on the coil. That will cause the circuit not to work if not connected
Feeding a 500kc signal to it just confuses things as it's too high to be at the IF and too low to be it the bcb. It serves no purpose other than to muddy the waters. Have you aligned the IF stage @ 470kc with an accurate generator?
If so I would I'd check rotor for the end plates being bent in shorting against the stator. Or a weak 6A7.
OBTW You didn't mention terminal 1 on the coil. That will cause the circuit not to work if not connected
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
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