[Heath] Replacement Caps

[Glen Zook]

At r.f. frequencies, orange drops, etc., can cause problems.  Disc ceramic capacitors, generally, do a much better job of bypassing than do capacitors like orange drops and other "poly" types of capacitors.  Now, for audio coupling capacitors, many people, including myself, do believe that these "poly" type capacitors do a slightly better job.

Also, disc ceramic capacitors are, usually, much less expensive than the other types.
 Glen, K9STH 
Website: http://k9sth.net

      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: Doug & Kathy Davies <dkdavies3 at gmail.com> 
Cc: Heath at puck.nether.net
 Sent: Thursday, February 1, 2018 10:43 AM
 Subject: Re: [Heath] Replacement Caps
   
 
> Can I replace disc ceramics with the 'orange drop' types?

Well, yes, you CAN, but why would you want to? The orange drops are much larger, and in 
my opinion, look ugly in an old radio. What is wrong with the disk ceramics? Do you need to 
replace those? In my experience, they very seldom ever go bad.

>  The values I need i can't find under 
> the disc ceramic headings.

As we have been telling you, you do not NEED "exact" value replacements! The tolerance 
of the original caps is so loose that anything even reasonably close will work just fine.

> I have a silver mica cap .001 @ 2kv.  This value is not available in silver mica.  What can I 
> substitute with?

A value that high usually means either it is a resonating capacitor in a low frequency circuit, 
or is simply a bypass cap. That value of cap IS still available, but will be somewhat difficult 
to find. If you tell us what circuit it is being used in, we can better advise you on what to sub 
it with.

> I need some .005uf mylar caps.  This value is not available in mylar.  Substitute?

Again, as we have been telling you, "anything reasonably close". 0.0047 for instance. 
Again, trying to find an exact value shown on the capacitor in question is unnecessary.

   
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