[R-390] Looking for a 5-25 pF Trimmer

[Jordan Arndt]

I has a spare Xtal Osc deck that I stripped for the trimmer caps and I've 
cleaned and re-used many of them.

What I've found is that when necessary a low value cap, from 2 to 8pF tacked 
across a flaky or stuck trimmer in the xtal osc assembly has solved issues 
caused by a stuck cap that would normally require the complicated 
dis-assembly of the xtal osc. assembly...

Sorry if this isn't too elaborate or clear , but it's just after 5 in the 
morning and the caffeine hasn't kicked in yet...

73...Jordan VE6ZT

----- Original Message ----- 
From: "Jacques Fortin" <jacques.f at videotron.ca>
To: "'Barry'" <n4buq at knology.net>
Cc: "'R-390 Mailing List'" <r-390 at mailman.qth.net>
Sent: Friday, September 20, 2024 1:34 PM
Subject: Re: [R-390] Looking for a 5-25 pF Trimmer


> Hi Barry,
>
> "Frozen" Erie trimmers are a common problem in Collins radios (S-line and
> etc.).
> Glen Zook wrote a procedure to "repair" those.
> But it does not always work.
> When you got a frozen trimmer into the R-390A crystal deck, you have to
> rebuilt the unit entirely (guess how I know).
>
> About yours now: how much do you need ?
> BTW, remove the rubber insulator: it is only there to prevent the rotation
> of the thin ceramic disk, but what happen most of the time is that the 
> small
> disk "adheres" to the top portion and rotate with...
> I will send you all the replacement parts if you still need those.
>
> 73, Jacques, VE2JFE in Montreal
>


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