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[Amps] GI-7b issues

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Subject: [Amps] GI-7b issues
From: "Robert Perdue" <>
Date: Tue, 9 Sep 2008 12:57:00 -0500
List-post: <">>
Looking for any info on the GLA-1000 conversion to the GI-7b tube. I have done 
the w4emf conversion but I am having problems with the tubes self destructing. 
has anyone else had issues with this tube? The amp runs fine and then boom the 
tube melts down without any indications I have watched current draw very close 
and that seemed fine but the tube just fails with a pop it melts the solder out 
of the tube around the Anode cap. Could it go into oscillation causing this? 
And for some background I ran the filaments for 48 hours before use. I have got 
4 more tubes ready to go again but would like to find the problem before 
proceeding. Anyone else having failures?

73, Bob kc0hfl  
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