[R-390] Replacement Capacitors

[Cecil]

These are go no go situations...what about the caps that develop series leakage resistance and just slowly drag performance down....I think there are more old radios suffering from this unattended issue than anything...and also caps that seem to go from .01uf to 100 pf or some such and don't do their jobs of bypassing or coupling and result in poor performance...

Most wont know about these because they don't result in smoke or blown fuses but generally sneak by as a marginally performing radio....

Just went through a Racal RA17 with a bunch of that going on...spectacular radio after the work.

Cecil

Sent from my iPad

On Apr 25, 2013, at 8:03 PM, "Charles P. Steinmetz" <charles_steinmetz at lavabit.com> wrote:

> Bob wrote:
> 
>> What awful things happen if it shorts?
>> 
>> If it's a cap to ground, in general the answer is "not much".  Yes there are a few exceptions, but in general there is no massive belch of smoke from any vital part of the radio. Replace the cap and all is well.
> 
> The gotcha with B+ bypass caps is that you can lose a filter choke (as well as rectifiers and resistors, but, as you note, those are not the end of the world).  I have seen this happen more than a few times, including to one of my own radios.  Replacement chokes can be very difficult to find.
> 
> Best regards,
> 
> Charles
> 
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