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Re: [Amps] SB 220 Exploding Resistor

Subject: Re: [Amps] SB 220 Exploding Resistor
From: Louis Parascondola via Amps <>
Reply-to: Louis Parascondola <>
Date: Sun, 17 Jan 2016 13:44:14 -0500
List-post: <">>
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 <>
To: Amps <>
Sent: Sun, Jan 17, 2016 12:42 PM
Subject: [Amps] SB 220 Exploding Resistor

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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