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Re: [Amps] SB 220 Exploding Resistor

To: Tom Hellem <>,
Subject: Re: [Amps] SB 220 Exploding Resistor
From: Paul Baldock <>
Date: Sun, 17 Jan 2016 12:03:58 -0800
List-post: <">>
It was probably an arc in one of the uibes. Use an ohm meter and make sure there is no short between the plate caps and ground. Assuming there isn't, replace the resistor (usually 25 Ohm wire wound 25W) and try again.

- Paul

At 08:05 AM 1/17/2016, Tom Hellem wrote:
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.

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