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Hard to price something so rare.

212s are very rare and are something of a cult item in Japan so pricing them is going to be difficult. One vendor has STC4212E at $USD1500 each NOS. These are claimed to be the best of the 212 series.

Your ex-flea market example is likely to worth somewhat less but still way more than you paid for it. Ebay maybe? - you'll need to test it first. Take care with the 2500volt B+. The filament takes 14V at 6A - I suppose you could fire it up with a 13.8V ham radio supply.


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