[Amps] SB 220 Exploding Resistor

[Louis Parascondola]

I also have those resistors if he is out.  The original resistors were sort of specialspecial in a way.  They are sort of a fuse type.  They were used in the Drake L4 B+ line and asasa grid shunt in the 220.  They look just like a full carbon composition but it isn't Just that.

Sent from AOL Mobile Mail


-----Original Message-----
From: Dale LeStourgeon <dlestourgeon at cox.net>
To: 'Tom Hellem' <tom.hellem at gmail.com>; Amps <Amps at contesting.com>
Sent: Mon, Jan 18, 2016 08:40 AM
Subject: Re: [Amps] SB 220 Exploding Resistor


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 [<a href="mailto:amps-bounces at contesting.com?">mailto:amps-bounces at contesting.com</a>] On Behalf Of Tom Hellem
Sent: Sunday, January 17, 2016 10:06 AM
To: <a href="mailto:Amps at contesting.com">Amps at contesting.com</a>
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
_______________________________________________
Amps mailing list
<a href="mailto:Amps at contesting.com">Amps at contesting.com</a>
<a href="http://lists.contesting.com/mailman/listinfo/amps" target="_blank">http://lists.contesting.com/mailman/listinfo/amps</a>

_______________________________________________
Amps mailing list
<a href="mailto:Amps at contesting.com">Amps at contesting.com</a>
<a href="http://lists.contesting.com/mailman/listinfo/amps" target="_blank">http://lists.contesting.com/mailman/listinfo/amps</a>