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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