[Collins] 75S-3C

[David Knepper]

If you go to Ebay, there are several firms (China, etc.) selling mylar 
polyester capacitors at ridiculously low prices and often with free 
shipping.

Stock up on the values that you need for your Collins - I do.

Forget about the "doomsday" advice of others that these capacitors are 
rejects, seconds, etc.

Just thought you would like to know

David Knepper - W3CRA/W3ST
Collins Radio Association
www.collinsra.org
Join the CRA today
-----Original Message----- 
From: xfrmrs at roadrunner.com
Sent: Wednesday, September 03, 2014 8:12 AM
To: Carl ; collins at mailman.qth.net ; geraldj at netins.net
Subject: Re: [Collins] 75S-3C

I have to agree with Carl on the orange drops. I have tested new ones at 
voltage and found 50% of them as leaky as the old ones. I use yellow jackets 
where intended and always check them before putting em to work. If you can 
find a good working, rated voltage cap checker, it is a good investment.
Regards,
Gary...WZ1M
---- Carl <km1h at jeremy.mv.com> wrote:

=============

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at netins.net>
To: <collins at mailman.qth.net>
Sent: Wednesday, September 03, 2014 12:24 AM
Subject: Re: [Collins] 75S-3C


With it sitting unused, you will need to care for the aluminum
electrolytics that have moved towards self destruction. Probably need to
replace all, and if the black beauties haven't been replaced they need
to be replaced too with orange drops because they are all leaky.

** Orange Drops are a complete waste of money and space for large values and
besides, they are now made in China as that division has been sold at least
twice since Sprague went away.
The axial lead film caps are just as good, smaller, and arent as ugly.



I haven't any experience with the tubesters, but if you go back to tubes
you will probably have to replace tubes more often and replacing tubes
next to tuned circuits usually means a bit of alignment is needed for at
least those next to the replaced tube.

** Maybe in the RF and first mixer but the wise thing to do is buy a couple
from the same batch or at least manufacturer so spares are readily
available. If a tube swap requires a drastic realignment then Id be
concerned about the old or new being a problem as long as the old was
realigned only when new. Normal aging should not require realignment as that
set has more than adequate gain available to compensate.

Carl
KM1H


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