Most likely a tube arc from gas or somehow B+ shorted. It is not stock. It
was added. Replace with similar and check frid shunt resistor. Check tubes,
one may have shorted.
Sent from AOL Mobile Mail
-----Original Message-----
From: Tom Hellem <tom.hellem@gmail.com>
To: Amps <Amps@contesting.com>
Sent: Sun, Jan 17, 2016 12:42 PM
Subject: [Amps] SB 220 Exploding Resistor
Hi-
My SB 220 has what appears to be a glass coated wirewound resistor in
series with the anode B+
supply lead just before the RF chokes. It is not on the schematic so must
have been a modification
done at some point. It blew up in spectacular fashion one day and I
hesitate to just replace it without
having some idea of what may have been the root cause. I do not have much
of an electronics background
and would appreciate if someone could suggest some things that I should
check out before I try to put it
back on line.
73 To All on The List.
Tom
K0SN
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