[Amps] SB 220 Exploding Resistor

[Louis Parascondola]

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.

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-----Original Message-----
From: Tom Hellem <tom.hellem at gmail.com>
To: Amps <Amps at 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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