12-11-2023, 10:28 AM
Hi Don,
You can try lowering the value of #10 0r #20 But 1st I would pull the osc coil out and heat it up (heat gun) to melt to wax off of it. Inspect it for green dots of death. These are little dots of copper corrosion within the winding that are not quite all the way thru yet. If you see any green dots it's time to rewind. It's common on the cathode winding (feedback) to be intermittent of open. 40ga wire equals about 1 ohm per ft so 38ga is going to be a bit longer a 5 1/4'. This is a rough measurement
By baking the coil forms in the oven at low temperatures it releases the moisture from the form. The moisture lowers the efficiency of the coil (aka Q). This is a good thing.
https://philcoradio.com/library/download...%20146.pdf
GL w/y project! Back to 90 on the bench.
You can try lowering the value of #10 0r #20 But 1st I would pull the osc coil out and heat it up (heat gun) to melt to wax off of it. Inspect it for green dots of death. These are little dots of copper corrosion within the winding that are not quite all the way thru yet. If you see any green dots it's time to rewind. It's common on the cathode winding (feedback) to be intermittent of open. 40ga wire equals about 1 ohm per ft so 38ga is going to be a bit longer a 5 1/4'. This is a rough measurement
By baking the coil forms in the oven at low temperatures it releases the moisture from the form. The moisture lowers the efficiency of the coil (aka Q). This is a good thing.
https://philcoradio.com/library/download...%20146.pdf
GL w/y project! Back to 90 on the bench.
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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