[AMPS] Tube Shorting

[Bruce Plantin]

Hi all,
I have a expensive tetrode with low hours. The control grid appears to be shorting to the filament on occasion, almost distroying my grid current meter (meter reads far beyond zero). If B+ is on, Ip of course jumps sky high. 
Are there any 'magical cure techniques' available that I could try? Obviously I could junk the tube or save for a rebuild.

Regards,
Bruce 


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