[R-390] Antenna Trim trouble/Capacitor Q question

[Jordan Arndt]

I'm still unable to remove the roll pin, and the punch I was using actually 
broke off near the business end, so I'm stuck there for now.

Q:  What happens when you use 2 x 18pF SM caps in // to replace a single 
36pF..?

Specifically, I want to replace C-211, a 36pF cap, but I only have 18pF and 
39pF SM caps on hand.

Aside from ordering more caps, which is the "better" solution, using 2 x 18 
or a 39pF cap to replace C-211...?

Your thoughts are much appreciated....73...Jordan VE6ZT






----- Original Message ----- 
From: "Jordan Arndt" <Outposter30 at shaw.ca>
To: "'Collins R-390 HF Receiver List'" <r-390 at mailman.qth.net>
Sent: Saturday, June 08, 2024 12:05 PM
Subject: Re: [R-390] Antenna Trim trouble


>
> Well, my first attempt to remove the roll pin was not a success...The pin 
> didn't budge and the roll pin punch bent. I'll try the freeze/torch 
> process and I hope that works. The punch I used was 1/16" which appeared 
> to center and fit properly, but it was/is a fairly cheap tool. I may look 
> for a tougher type of punch.
>
> My problem did not appear to be grounding of the AGC line, only slight 
> scratching as I turned the Ant Trim control, so using my Sprague TO-6, I 
> tried to see if I could provoke "leakage" using the insulation resistance 
> test of the TO-6, but to no avail...
>
> That's all for now...
>
> 73...Jordan VE6ZT
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