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Scoots,
I wouldn't bother with NOS power tubes in a HRDV, unless you have money to burn. That amp (I have a HRDX, so I know whence I speak) was designed to run with new production tubes, specifically Groove Tubes. Properly biased, they should last a while. I usually would get about 500-600 hours on them before I had to change them. Got a set of JJ 6L6s in there now, and actually like them a lot better in this amp than the Groove Tubes-rounder sounding would be the term I would use to describe their sound, and quite punchy. YMMV, of course...
Franc Robert
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