Amps
[Top] [All Lists]

[AMPS] Mixing Tubes in an SB-221

To: <amps@contesting.com>
Subject: [AMPS] Mixing Tubes in an SB-221
From: KF0FX@aol.com (KF0FX)
Date: Thu, 2 Apr 1998 13:20:43 EST
Here's the problem.  I have an SB-221 with one dead Eimac 3-500Z and one that
seems to be working okay (both tubes have been in the amp since 1982).  The
bad tube seems to have 0 cathode emission.  Emission on the good tube seems to
be okay.  What is the implication of purchasing a single, cheap tube to
replace the bad Eimac?  What problems can I expect?  I know that it's probably
a good idea to replace both tubes at the same time, but I'm trying to squeeze
some more life out of the amp before I have to invest too much money.

FWIW, I suspect the bad tube was damaged when parasitic oscillations ran
through the thing a couple of years ago.  Since then I have re-worked the amp
to eliminate the problem.

73's
Chris, KF0FX
KF0FX@aol.com

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm

<Prev in Thread] Current Thread [Next in Thread>