JB-12 trimmer capacitor

[Crasher]

Just picked up a JB-12 modualtor with a broken trimmer capacitor on the back. Would anyone know the value of this pot or know what I could replace this with? Much appreciated
Thanks

 

[wavrider]

Wawasee Electronics JB-12

link to schematic hope this helps

 

[RadioGuy772]

Just an FYI - as you said, it is a variable capacitor. Then later, you referred to it as a pot. "pot" is short for potentiometer, or a variable resistor. A different animal. Not being picky, just helping so if you go to order the part, you get what you need.

 

[Shockwave]

Unfortunately that part is not a standard over the counter component. It's a custom RF transformer with an adjustable slug. It's purpose is to match the 50 ohm output of your radio to the 1500 ohm value of the grid input resistor.

 

[RadioGuy772]

Ahh that's right, not looking at the schematic, I remember that..these used the 8417 didn't they?

 

[Crasher]

Thanks for the info. It works, just a bit bent. I'll just leave it be.

 

[Shockwave]

Ahh that's right, not looking at the schematic, I remember that..these used the 8417 didn't they?

Yes, they are very expensive and not worth replacing either. If your JB-150 needs a new 8417, consider a 6L6GC as a small step backwards or a 6550 as a small step forwards. Both cost less than a 8417 and have the same pinout. The JB-12 uses a 6BQ5 incidentally.