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At this point, the only thing to do (without voiding the warrenty) is to get a new el84 and a new 12ax7 and replace the tubes. Replace one at a time, and see if any single tube takes care of the problem. Then, you can do both. It is not real uncommon to have tubes go off during shipping.
$319 at the local shop...YIKES. MSRP is only like $250 (for the combo). As you already know, online for the combo is $150-175 for the combo. Maybe that one is modded. If so, depending on the mods, it could be too much, about right or a deal.
Yours is still under warranty, if you purchased new. If new tubes don't fix it, send it back. If new tubes do fix it, call the seller and tell him you want another set sent to you. He probably won't pay for the tubes you bought, but you will have spares.
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