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.
73
Dale K5AJZ
-----Original Message-----
From: Amps [mailto:[email protected]] On Behalf Of Tom Hellem
Sent: Sunday, January 17, 2016 10:06 AM
To: [email protected]
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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