[Boatanchors] Ceramic "Dogbone" Capacitor Replacements

[Bonddaleena at aol.com]

In a message dated 2/7/2006 2:41:42 PM Eastern  Standard Time, 
anchor at ec.rr.com writes:
Hi Bill,
I'll  jump in, but I'm sure there'll be more opinions (all are worth
what you pay  for them).
Looking bk in history, Hammarlund recommended  using disc ceramics
everywhere when replacing the BBOD's, and they did so in  SP-600's after
somewhere in the 17,000's ser. no.s   About the same  vintage as the
75A-2/3 R-388/51J-3's.
I do a lot of  SP-600 work, as well as some R-388's.  If it's for
somebody else, and  they have a preference, I will use polypropelyne Orange
Drops for coupling  caps.
Sometimes I will use a new dipped silver mica,  particularly in the AGC
of the R-388/etc. where there's one old mica that  frequently goes leaky &
screws up the AGC.
YMMV
73,
Al,  W8UT
New Bern, NC
BoatAnchors appreciated  here
http://www.thecompendium.net/radio/
soon to be at  http://www.boatanchors.org
http://www.hammarlund.info

----- Original  Message ----- 
From: "Bill Pancake" <bpancake at mindspring.com>
To:  <boatanchors at mailman.qth.net>
Sent: Tuesday, February 07, 2006 2:22  PM
Subject: [Boatanchors] Ceramic "Dogbone" Capacitor  Replacements


> Would appreciate some advice on what "type" of  modern replacement
capacitor can be used in place of the ceramic (10,000 mmf,  350 vdc)
"dogbones" used throughout a Collins 75A-2/3 receiver as coupling  caps,
etc... ceramic disk, mylar, tubular film, ??? Thanks in advance for  any
recommendation, 73, Bill
>
>
>
>
>
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I second Al's recommendation for the use of Orange Drops. However, I wonder  
why you would want to replace the dogbones? I have never seen one fail my  HV 
test, and they have always measured 'spot on' when checked with my NIST  
traceable cap bridges....
I have recapped several hundred boatanchors and if I encounter a BBOD or  
"brown tur*", it gets replaced without bothering to check it's leakage. I got  
buckets of them. All NFG. Why do I keep them? Just to show some of my friends  
just how bad they are!
 
ron 
N4UE