12-15-2023, 08:10 PM
Yes that's what I was getting at is the IF stage oscillating? If so then you need to get that sorted. It's independent from any setting on the set's dial or whether the osc is working or not. Sometimes a slight detuning of the IF will stop the oscillation and still leave lots of gain for the set to preform well.
The next issue is to figure out what the oscillator is doing. The simplest way is to use a well calibrated receiver to track the signal from the 6A8. If it uses a 6A8G wrap a few turns of wire around it and connect it to the ant of the tracking receiver. If it's a metal tube hook the two ant together with cap between. At 550 the osc should be running at 1000kc more or less. At 1500kc -1950kc or so. As you turn the dial on the crosley you should be able to follow or track the osc w/the other receiver. If the osc doesn't tune 1000kc to 1950kc most of the time the the rf section won't tune the same frequency - 450kc so the set won't receive stations in the proper places on the dial and it will poor sensitivity.
So for now don't worry about what the dial sez just see how far you can get the osc to track across the 1000kc-1950kc range. That's what it need to be doing.
OBTW I don't draw the tubes upside down.
The next issue is to figure out what the oscillator is doing. The simplest way is to use a well calibrated receiver to track the signal from the 6A8. If it uses a 6A8G wrap a few turns of wire around it and connect it to the ant of the tracking receiver. If it's a metal tube hook the two ant together with cap between. At 550 the osc should be running at 1000kc more or less. At 1500kc -1950kc or so. As you turn the dial on the crosley you should be able to follow or track the osc w/the other receiver. If the osc doesn't tune 1000kc to 1950kc most of the time the the rf section won't tune the same frequency - 450kc so the set won't receive stations in the proper places on the dial and it will poor sensitivity.
So for now don't worry about what the dial sez just see how far you can get the osc to track across the 1000kc-1950kc range. That's what it need to be doing.
OBTW I don't draw the tubes upside down.
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 it!
Terry
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