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TESLA E88CC 6922 Tubes shorting out???

Hi everyone , I bought quite a bit of Tesla E88CC Tubes white pin. I have tested all of them on my tubes tester, for shorts and for life, they test extremely well. In my ARC ref 1 they sound magnificent, they are so natural it's incredible. The tubes seem to like my ARC Ref 1, no issues with them. As soon as I put them in my amp ARC VT130 SE, in the input stage they seem to last no longer than 20 minutes before you start to hear popping and the channel dies out. So I remove them and install 6H23P-eb and everything is fine again. I then test the removed Tesla on my tester and one of the tubes has shorted out????
Does any one know what's going on ? It has happened twice now..............

Thanks
slates

Showing 2 responses by slates

slates OP
35 posts
 
Thanks Newbee, No these tubes are from the early 90's, they are not JJ
tubes. These tubes are not rugged at all, but they sure sound nice. I'm not putting any in the amp any more. Maybe in the summer I will have it tested
to see if in fact the filament is 6.3 Volts??.

Thanks
slates OP
35 posts
 
Newbee, they work great in my ARC ref 1 they don't get along with the ARC VT 130 SE. I think they don't like higher voltage............
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