The outside foil of condensers is
usually connected to ground for shielding. If this is ignored in
the IF section of some receivers, oscillations and instability
can be a problem. In a scope or audio amplifier, the result is
likely to be hum or strange signals that come from nowhere.
??? Bruce Gentry, KA2IVY
On 10/27/21 20:31, Jim Ford wrote:
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Hmmm... could you please direct me to Mr C?? I couldn't find
him online; my google-fu must be rusty.
And, what does the foil side of a capacitor sound like??
Versus the other side?? I'd have to try that, although I don't
own a vacuum tube guitar or bass amp (not yet, anyway).
Thanks.
Jim Ford
------ Original Message ------
Sent: 10/27/2021 4:02:55 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Re-capping an
HP-130 Scopes
Yep been a Mr C fan for a while.? He designed a neat little
rig that checks for foil side of a cap.? I think my second
build ever.? Works great.? I even took apart a few spare
modern caps to see if the the Mr C?SIFT works and it does.
The old 'Amp' test is one that works as well.? Plug the cap
into a guitar amp crank up the volume and you can hear the
foil side.
