[Amps] SB 220 Exploding Resistor

[Carl]

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.

Carl
KM1H

----- Original Message ----- 
From: "Tom Hellem" <tom.hellem at gmail.com>
To: <Amps at contesting.com>
Sent: Sunday, January 17, 2016 11:05 AM
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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