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Re: [Amps] SB 220 Exploding Resistor

To: "'Tom Hellem'" <>, <>
Subject: Re: [Amps] SB 220 Exploding Resistor
From: "Dale LeStourgeon" <>
Date: Sun, 17 Jan 2016 19:48:16 -0600
List-post: <">>
Tom, go to Harbach and buy a pack of their .82ohm resistors 2W ( $6).  Your
resistor did its job as it acts like a fuse in case there is a tube or other
b+ short. Many amps used something like this. I had this issue with my L4B
recently when a  tube failed.  Glad Harbach  has the resistors since
otherwise there are hard to find.
Dale K5AJZ

-----Original Message-----
From: Amps [] On Behalf Of Tom Hellem
Sent: Sunday, January 17, 2016 10:06 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.

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