[Radioroslyn]

The 200 and 201 chassis were only used in the X cabinets. That's what makes it a 201X the combination of a given chassis and a particular style cabinet. For the most part X,H, and L are consoles. B's are cathedrals and tombstones. CS, LZ,LZX, and RX are chairsets. The list goes on...

Math is not my strong suit but here's a starting point. Perhaps one of the Mike's can help out will this issue. https://www.electronics-notes.com/articl...filter.php For now you could connect the top of the 100K resistor over the plate of the 75 to get it working.

[462ron]

bgorman, here is a website that can help you calculate the inductance you need!
https://goodcalculators.com/resonant-fre...alculator/

Ron

[bgorman]

>For now you could connect the top of the 100K resistor over the plate of the 75 to get it working<

Nice, I was thinking that I could do that very thing to at least be able to test it. Learning a little more everyday from you all.

Also thanks for the info on what the different letters mean.

[bgorman]

Ron
Thank you so much for the link, major time saver for me. 

So in the calculator, for frequency, would I use the 10 KC it supposed to create ??

and the circuit has caps  #69  & #72  as well as the #71 (adjustable). would I measure the total capacitance of all 3 ?

If so, the total capacitance measures out at 370 pf

If I plug in those 2 factors
10 Khz
370 pf

It gives me 684 Millihenries Does this seem right?

[462ron]

I believe 69 & 72 are there to remove any residual IF carrier frequency left after demodulation. I would just use whatever value 71 is to solve for the inductance of 70.

Ron

[bgorman]

Life got busy here, but back at this unit. Hoping to get this figured out and be able to move on.

So the compensating cap #71 (as it is adjusted) measures 280 pf
The trap is 10KC

If I plug those 2 values into the calculator Ron links too, it gives almost 1H inductance.   I'm no expert at this so wondering if that seems right ??

I found a 1H choke at antique electronics  P-T158T  but its only 40 ohms. If the calculation is correct would this one work ??
Thanks 
Bob

[462ron]

I come up with approx. .9 H. Not being an engineer, I would give it a try with the part you found and see how it goes, it won’t hurt anything! GL.

Ron

[bgorman]

 < I come up with approx. .9 H. Not being an engineer, I would give it a try with the part you found and see how it goes, it won’t hurt anything! GL. >

Great thank you for chiming in Ron, feel more comfortable with trying it.
Bob