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I don't have any new ones. However I was going to order some off eBay and give it a shot. I did test the tube in my tube tester and it comes up as decent emissions and no grid leakage. But I don't know if this is one of the tubes that will test good and actually be bad. The set is high hours, and I've had to replace quite a few week tubes in it. The 6gh8 is actually a Zenith tube possibly original.
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