wanted-572B tube

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Original poster: Fucian@xxxxxxx 

Hello all,
my vttc based on an 811A is doing good, but it just gets hot quick. 
After destroying one 811A(messed with the feedback coil a bit too 
much, and 500watts on the plate :-D), i have fallen in love with the 
572B(from what ive read about it). A graphite plate, high voltage, 
and most importantly...RUNS ON MY 6.3volt 8amp filament transformer :-)))))
I won a GE 833A triode on ebay, but just hate the idea of a 10vac 
10amp filament transformer. Im rewinding a 1kw 60hz toroidal 
transformer for 10vac right now in case i have to go with the 833A. 
Ive checked ebay for the 572B, and the majority are pricey NEW 
chinese tubes. I dont want a new tube, as its going straight to tesla use.
Anyone out there have a few used 572B tubes for a good price?Or want 
to trade for the 833A?
Thanks!
Matt