[MRCA] Trimmer Capacitors

[Rob Flory]

PS, I had the advantage of the collars being present but they had slipped
on the shaft, being merely press fit.

RF


On Sat, Sep 6, 2014 at 11:26 AM, Rob Flory <farmer.rob.flory at gmail.com>
wrote:

> I had a similar problem with Navy RBM and RBS receivers.  I was able to
> fix the caps by wedging the plates apart and soldering  the shaft.
>
> RF
>
>
> On Sat, Sep 6, 2014 at 10:58 AM, D. Platt <jeepp at comcast.net> wrote:
>
>>  Folks,
>>
>> As I mentioned in an earlier article in *Electric Radio*, the ceramic
>> trimmer capacitors used in the four "modules" in the BC-348( ) receivers
>> are further showing failures.  Note that this does not include the J, N,
>> and Q models as they have an entirely different variety of trimmer.  I have
>> just completed going over three more BC-348 receivers, one Q model, and two
>> R models.  Both R models had capacitor issues with a total of four failed
>> capacitors.  In each case, the capacitor was without the retaining collar
>> thus allowing the spider to spring back, effectively shorting out the
>> capacitor.  Fortunately, I had a few spares was was able to simply (sic)
>> remove and replace each defective component.  At this point, though, I'd to
>> again admonish all to inspect their affected BC-348 receivers.
>>
>> As a preventative, one might consider spraying some DeOxit on the front
>> of the capacitor, prior to adjustment.  This may relive any corrosion
>> between the hex collar and the fixed collar, below.  If one always adjusts
>> the capacitor via the screwdriver slot, and not the hex head*, there's not
>> much else to do to avoid a failure.
>>
>> Regards   Jeep - K3HVG
>>
>> * In most cases, the hex head is recessed and can't be used, anyway.
>>
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