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Re: [Amps] SB 220 Exploding Resistor

To: "Tom Hellem" <>, <>
Subject: Re: [Amps] SB 220 Exploding Resistor
From: "Carl" <>
Date: Sun, 17 Jan 2016 13:19:20 -0500
List-post: <">>
That blown resistor may have been underated and blew during a tube arc. The idea of a surge suppressor is to not fail and allow the milliseconds for a fuse/breaker to open.

A 10-15 Ohm 20-25W Real wirewound resistor will cure that problem. Look for Vitreous Enamel in the description.


----- Original Message ----- From: "Tom Hellem" <>
To: <>
Sent: Sunday, January 17, 2016 11:05 AM
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.

73 To All on The List.

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