[R-390] AGC Cap Revisited

[Renée Deeter_k6fsb]

Barry-
Wow!! Looks good to me what really matters is that it works and is 
reversable. The best part is that it is a Great way to add additional 
circuity to the IF deck without adding a NEW hole!!!  why didn't I see 
that???
Thanks
Renée, K6FSB

Barry wrote:
> A few months ago, I discovered that the 2mfd AGC capacitor was leaking and
> affecting the proper AGC action in one of my R390As.  I removed it and
> attempted to open it up with the intent to restuff it; however, when I tried
> to unsolder the can with a torch, I decided that the fumes from the hot oil
> were something that I really didn't want to expose myself to (no one was
> really sure they didn't contain PCBs) so I decided to take a different
> route.
>
> After thinking of a few designs and staring at the open hole as shown below,
>
> http://www.knology.net/~thelanding/R390A/AGC/AGCReplacement1.jpg
>
> it occurred to me that this looks very much like a hole that an octal socket
> would fit nicely into.  Sure enough I found a socke that would fit right in
> the opening with no modifications to the deck required.
>
> http://www.knology.net/~thelanding/R390A/AGC/AGCReplacement2.jpg
>
> The next picture shows the underside with the connections to the socket
> complete.
>
> http://www.knology.net/~thelanding/R390A/AGC/AGCReplacement3.jpg
>
> Using a tube base, I easily soldered the new capacitor in place and plugged
> it in.
>
> http://www.knology.net/~thelanding/R390A/AGC/AGCReplacement4.jpg
>
> Whaddya think?  It might not be as "pretty" as the original, but it's sure
> to work.  Also, it makes it convenient, if one should so desire, to be able
> to plug in different value AGC capacitors to suit however you like it.
>
> Of course I wouldn't have done this if the original capacitor had been okay,
> but since it needed to be replaced, this seemed like a non-invasive and
> completely reversable approach.
>
> I need to replace the carrier-level adjustment resistor and it got late so I
> haven't put the IF deck back in and tried it yet, but I don't see why it
> won't work.  I plan to machine a small cover to epoxy over the tube base so
> the capacitor isn't sitting there bare, but it should be fine for now.
>
> Regards,
>
> Barry - N4BUQ
>
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