Those Tung-sol 7581a tubes have disappeared overnight on eBay. There used to be dozens of listings. I just searched and found one, and they were advertising it as their last pair. Rather amazing how fast they have been scooped up. Or else sellers have pulled their listings, waiting to see how high prices will go.
A case of price gouging when one is sitting on a supply of tubes purchased at lower prices, then sell them for much higher prices. But that is capitalism.
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