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Hi MIPS ,
perhaps try anouther vert tube or 2-just because it tests good doesnt mean its gonna work properly in cct or be temp stable.
if you need a tube, i can look through my stash for a free used one.you are not that far so shipping would be cheap, or if you are heading into Van in the next while,feel free to drop by and p/u. if i got a few ,i can send you several to try.
RonL
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