Bob,
If you have the amps, swapping the tubes should be just part of the yearly
maintenance that you should do to you amp. Clean the dust out of the inside
of the cabinet, tubes (I think Alpha has a WEB page dedicated to plugged up
tubes due to dust) and clean the bandswitches and relay contacts if you can
and oil the blower (s). This should be done every year, and while you are
at it, swap out the tube (s)..
Thanks and 73's,
Dudley
WA5QPZ
jhurry@austin.rr.com
----- Original Message -----
From: "Bob Harmon" <k6uj@pacbell.net>
To: <amps@contesting.com>
Sent: Tuesday, November 05, 2002 8:11 AM
Subject: [Amps] maintaining spare finals
Hi all,
I'm new to the list and tried to send this query once allready, hope I
didn't send it twice !
I was surprised to read the article in the referenced web page about the
need to swap "spare" final tubes in our amps every year to prevent gassing
problems. I would appreciate your input on this subject. In my case, I
have spare 572b's, 8877's stored away and it wouldn't be practical to
rotate/swap them into my amps every year. If this is really a problem,
would it be a workable scheme to make a chassis with the tube sockets for
the finals and simply feed filament voltage to the tubes for several days ?
I could see doing something like this every year to maintain the finals ?
Any ideas ?
web page article:
http://www.qsl.net/kk5dr/Tubes.html
73,
Bob, K6UJ
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