[R-390] Orange Drop Capacitors

[Cecil Acuff]

The Collins engineers were limited by two things...cost and available 
technology at the time.  There were no doubt better caps available than was 
used in the R-390A...all one has to do is look back to the R-390/URR to see 
that, but cost was the culprit.  Most of the caps I am aware of that are 
being replaced in the "A" are paper caps and the orange drops are very well 
suited to the job and should out last the original paper caps by a factor of 
at least 2.  No question other caps available today will also do the job. 
I've seen anything from yellow poly caps to German made film caps.  All will 
work.  I guess if you wanted to you could change them all with ceramic disks 
as is done in the SP-600 series.  I think the orange drops have better 
characteristics for coupling and use in audio stages than the ceramics which 
are well suited for bypass work.  In summary the orange drop is just hard to 
beat for all around general use....and by all means stay away from anything 
NOS in paper capacitors.

Cecil Acuff
K5DL
----- Original Message ----- 
From: "keller family" <kellerfamily01 at charter.net>
To: <r-390 at mailman.qth.net>
Sent: Thursday, January 18, 2007 11:17 AM
Subject: [R-390] Orange Drop Capacitors


Does someone know why everyone is replacing every type of capacitor with 
orange drops where they can get them to physically fit.?  Didn't Collins 
engineers have a good reason for using all the different types of capacitors 
in the first place?
WB5KXO
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