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

[Barry]

I didn't realize the crystal oscillators have that many trimmers - and so many of them are 5 - 25 pF!  I don't plan on adjusting those - at least for now.  Things track nicely between bands - closely enough for me.  If I _should_ need to adjust them, though, I'll know to be much more careful with them.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Jordan Arndt" <Outposter30 at shaw.ca>
> To: "Jacques Fortin" <jacques.f at videotron.ca>, "Barry" <n4buq at knology.net>
> Cc: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Saturday, September 21, 2024 6:17:26 AM
> Subject: Re: [R-390] Looking for a 5-25 pF Trimmer

> 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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