I ATE a few of the EAT tubes (because that's what the box said--EAT!). I preferred lightbulbs, but your experience may vary.
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Yeah, right! $450 for an UNMATCHED pair!!! Buy some NOS tubes from Andy at Vintage Tube Services [doubt he'll have Telefunken 6922's], and save yourself some money!
It is impossible for a modern production tube to match the quality control, chemical purity [anodes], precession grid windings & terminations, and the hard vacuum of NOS tubes.