[Heathkit] Screen bypass caps (was DX-100B on Phone - bad audio distortion /oscillation)

[Ross Stenberg]

I have complete confidence that you will conquer the beast, but please 
when you do, let us know the cure. It is like reading a good book and 
being anxious to turn the page (or tapping the screen with your iPad).

On 12/15/2011 8:39 PM, Rick Poole wrote:
> Received in private email:
>
>   >>>>>
>> Silver micas capacitors, specially the postage stamp variety, are
>> not immune to silver migration, which is what happens when there is
>> a constant DC high voltage across them but not when there is AC with
>> no DC bias on them.
> <<<<<
>
> This is from the grid to ground, so it'd have a more or less constant
> -70+/- volts on them and some low-level AC.
>
> But, wouldn't silver migration cause the cap to short rather than open>
>
>   >>>>>
>> That the oscillation stopped with the scope probe's presence is a
>> sure indicator of neutralization issues.
> <<<<<
>
> Well, so much for the myth that DX-100's don't need to be
> neutralized, I guess.  Note, however, that everything I have done
> since day one on this thing has been on 80 meters.  Neutralization
> problems on 80 meters?  Really?  Seems like a stretch...
>
> Rick WA1RKT
>
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,mmmmmmmm