02-24-2019, 09:56 PM
< You mentioned about 20 -30 turns, but I can see there are a lot more than that.
Yes this is true but the coil you are speaking of is the 1st IF transformer. The above is true for the rf and osc coils as they are used for coupling not resonant part of the circuit.
The IF transformer consisted of two tuned circuits which are resonant @ 175kc, which would take a lot of turns. Back in the day replacement parts providers sold complete IF transformers and you could buy separate coils too to be fitted to the original core if so desired. Your fortunate that it's a common frequency. Depending on the construction a lot of time the coil is held in place by wax so a heat gun can loosen it up and fit the replacement.
<Do you have any idea where I can get a coil.
No.
<Hopefully, would like to find some one who sells new old stock.
GLOM
<As the wire gauge, resistance of the coil, and the inductance are not stated
Gauge and resistance aren't particularly critical, gauge determines the physical size and current capabilities. Number of turns and inductance can be calculated.
< If I leave the shield off, I am concerned I might well end up with motor boating.
I would concur best guess is that's why it has one.
Yes this is true but the coil you are speaking of is the 1st IF transformer. The above is true for the rf and osc coils as they are used for coupling not resonant part of the circuit.
The IF transformer consisted of two tuned circuits which are resonant @ 175kc, which would take a lot of turns. Back in the day replacement parts providers sold complete IF transformers and you could buy separate coils too to be fitted to the original core if so desired. Your fortunate that it's a common frequency. Depending on the construction a lot of time the coil is held in place by wax so a heat gun can loosen it up and fit the replacement.
<Do you have any idea where I can get a coil.
No.
<Hopefully, would like to find some one who sells new old stock.
GLOM
<As the wire gauge, resistance of the coil, and the inductance are not stated
Gauge and resistance aren't particularly critical, gauge determines the physical size and current capabilities. Number of turns and inductance can be calculated.
< If I leave the shield off, I am concerned I might well end up with motor boating.
I would concur best guess is that's why it has one.
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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