[Milsurplus] Is This a Nutty Idea?

[AKLDGUY .]

As others have said, it's a very bad idea. If one of the old caps is a B+
decoupler
and one of the others is a grid circuit decoupler, any leakage in them will
cause
some portion of the B+ to appear in the grid circuit, possibly destroying a
tube.

Sure, you'd be providing a better quality decoupling for signal, but
raising those
leaky caps above ground provides a DC leakage path from one circuit into
another.

73 de Neil ZL1ANM


On Fri, Jan 13, 2017 at 7:55 AM, Mike Morrow <kk5f at earthlink.net> wrote:

> In short...yes...it's beyond "nutty".  What you describe is a very very
> bad idea.
>
> You wind up with whatever capacitive and resistive characteristics exist
> within the original capacitors cross-connecting to each other and their
> associated circuits through the now-ungrounded common case.  Plus, if one
> old capacitor shorts on an HV line, now the case will be at HV above the
> chassis.  There are other problems as well.
>
> So...don't even begin to do what you propose!
>
> Don't worry too much about the goop in the original capacitors if you
> decide to open and empty the case.  There's been way too much
> chicken-little nonsense about the alleged but imaginary dangers, which are
> essentially nonexistent unless you plan to eat the goop.
>
> Mike / KK5F
>
> -------- original -----------
> Several of them are three-cap units with the caps grounded through the
> case to the chassis. Here's my possibly crazy idea:
> 1. Replace the screws and nuts holding the bathtub to the chassis with
> nylon screws and nuts;
> 2. Use a nylon washer to physically isolate the bathtub from the chassis;
> and
> 3. Hang new caps on the three lugs on the bathtub and ground them at a
> convenient point on the chassis.
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20170113/16777525/attachment.html>