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If you are talking about the Groove Tube E 34LS thread.......

that is a good one. It twisted my arm and made me order 14 matched to each other GT E 34LS from my dealer. Groove tube grades its tubes. Don't forget to request the best ones(8-10. I requested all grade 9s. This tube is made by JJ on Groove Tubes machinery, using their design. If you really want to get fancy, try GT's reissue of the GE 6CA7. It's made in the USA on GE machinery, bought by GT, using the original parts.


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