[Hallicrafters] Indentifing capacitors (?)

[Glen Zook]

Capacitors these days follow the same "scheme" as
resistors (i.e. 47, 68, etc.) which actually have to
do with the percentage of tolerance.  However, the
newer capacitors are MUCH closer normally than the
original capacitors to the actual value.  For example,
older electrolytics may be as much as -50% / +80%
whereas the new ones are usually +/- 20%.

Thus, a 0.022 capacitor is going to be much closer on
average than a 0.02 capacitor.

"Paper" type capacitors were not normally used in any
circuit which required close tolerances since the
original ones vary all over the place in their actual
value.  For tuned circuits there are capacitors (disc
ceramic, etc.) that are much closer in tolerance and
are even available in 1% value steps.

Thus, the "modern" equivalent of the 0.02 is 0.022,
the "modern" equivalent of 0.05 is 0.047, and so on. 
The new "orange drop" capacitors are going to work
MUCH better than the old paper types (which start
going bad even before they are installed in anything).

Glen, K9STH


--- Steve & Sharon Nordentoft <sskn at msn.com> wrote:

I'm restoring a SX-24 and having some trouble finding
some of the caps with the exact values. Some are
close, but I'm not sure if they would be close enough.
Example: Will a .022 mfd 630 vdc work in place of a
.02 mfd 600vdc ? and Will a .0047 mfd 600 vdc work in
place of a .005 mfd 600vdc ?

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco


	
		
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