[R-390] Varying gain [WAS: Filters]

[Barry]

Others may have a clearer explanation of the "whys" for not using metalized foil, but as I remember the discussions, these caps "heal" themselves when a defective area in the dielectric is destroyed by a very temporary short between the adjacent films.  It is this process that can be detrimental to other components - in this case, the filter(s).

Regards,
Barry - N4BUQ

----- Original Message -----
> From: "Craig Heaton" <hamfish at efn.org>
> To: "quartz55" <quartz55 at hughes.net>, R-390 at mailman.qth.net
> Sent: Monday, February 4, 2013 9:51:43 PM
> Subject: Re: [R-390] Varying gain [WAS: Filters]
> 
> Dave,
> 
> I'll try to clear up the mystery. The archives, there is no search
> feature.
> One has to read each post, month by month. PIA, but I started there
> before
> getting my first R-390/A.
> 
> Another must reading is http://www.r-390a.net/. Under the References
> Wei-Li's "Pearls of Wisdom" has post that are categorized according
> to the
> section of the radio.
> 
> Of course: The one & only Y2K manual!
> 
> I'll say no more about capacitors, it only leads to the resurrection
> of the
> "dead horse". And it gets beat upon once again.
> 
> But when the keilbasi (sp) starts cooking.................
> 
> Craig,
> ----------------------------------------------------------------------------
> ----------------------------------------------------------------------------
> ---------------
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of quartz55
> Sent: Monday, February 04, 2013 6:45 PM
> To: R-390 at mailman.qth.net
> Subject: Re: [R-390] Varying gain [WAS: Filters]
> 
> 
> Great.  Well I still can't figure out how to 'search the archives',
> which
> and where archives, please, link please?  All I see is a list of
> months and
> years, no search feature that I can see.  All I get is email and the
> R-390 at mailman goes nowhere for me.  I guess I'm missing something or
> I'm too
> dense.
> 
> Never saw the items about the metalized foil vs. the film and foil.
>  The
> C551 was suggested here as the NTE.  I suppose since I have it, I'll
> use it,
> they weren't cheap.  I doubt if it will blow up.  So, it looks like
> the 716P
> orange drop capacitors seem to be film and foil.  I wonder why the
> metalized
> are suggested for HF filters and are not capable since I don't seem
> able to
> find the archives?
> 
> I really would appreciate some instruction on doing a search in the
> 'archive' which seems to be the R390 FAQ place, but I'm not sure.
>  Even that
> doesn't seem searchable to me.  It's a good resource, but seems I
> have to
> read through it page by page as a pdf.
> 
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