[Amps] SB 220 Exploding Resistor

[Louis Parascondola]

That probably won't indicate anything so I'd skip that.  Most G-F shorts don't show up with ohm meters and gives you false hopes. 99 out of 100 times this is usually true, so use the variac and single tube at a time method I described. That works every single time if the tube is bad and not just intermittently bad. 

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-----Original Message-----
From: Paul Baldock <paul at paulbaldock.com>
To: Tom Hellem <tom.hellem at gmail.com>; Amps <Amps at contesting.com>
Sent: Mon, Jan 18, 2016 08:39 AM
Subject: Re: [Amps] SB 220 Exploding Resistor


It was probably an arc in one of the uibes. Use an ohm meter and make 
sure there is no short between the plate caps and ground. Assuming 
there isn't, replace the resistor (usually 25 Ohm wire wound 25W) and 
try again.

- Paul


At 08:05 AM 1/17/2016, Tom Hellem wrote:
>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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