[Hallicrafters] Capacitor replacement questions

[David C. Hallam]

Film capacitors don't seem the have the "foil side" marked anymore.  If you
go to the SBE web site, there is a technical discussion by one of their
engineers that concludes, in the absence of any definitive evidence to the
contrary of which there doesn't seem to be any, it doesn't make any
difference which side of the capacitor is connected to ground or a low
impedance point.

David
KC2JD

-----Original Message-----
From: M. Ross Dumke [mailto:n5tde at earthlink.net]
Sent: Monday, July 17, 2006 2:08 PM
To: dhallam at rapidsys.com
Subject: RE: [Hallicrafters] Capacitor replacement questions


I would add the polystyrene are much more temperature stable than the Orange
Drops, which used to be made with rolled mylar. A general note is that if a
black band is marked on the case, it is the outer foil side and should go to
ground if used as a bypass. This acts as a shield from RF radiating out to
other components.

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of David C.
Hallam
Sent: Monday, July 17, 2006 11:22 AM
To: Darryl; Hallicrafters
Subject: RE: [Hallicrafters] Capacitor replacement questions


Darryl,

mmf and pf are interchangeable units, m is 10 -6; mm and p are both 10 -12
A chart isn't necessary just substitute pf for mmf.

SBE made "orange drop" are probably the most commonly used replacement
capacitor as they are high quality.  However I personally don't like them as
they have radial leads are sometimes hard to mount.  Any current manufacture
polystyrene/polyester capacitor is much superior to the old capacitors.  The
service conditions in a receiver are not severe and impose no difficult
operations conditions on a capacitor.

David
KC2JD

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Darryl
Sent: Monday, July 17, 2006 12:02 PM
To: Hallicrafters
Subject: [Hallicrafters] Capacitor replacement questions


Hello Everyone,

I'm trying to find out if mmf means pf on old capacitors, and if anyone has
a link to a chart?

Also, when replacing paper caps, I've noticed that most use "orange drop"
types as a replacement.
Is it the general consensus that these are the best replacements?

Thanks for your help,

Darryl

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