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Re: wanted-572B tube

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Matt,

The 572B will easily replace the 811A and work better. For a Tesla coil, they are very similar but the 572 will be able to push more power ;-)

One thing to be very careful of is many of the e-bay New tubes made in China are crap. Many of them will just fall apart or die on the first power up. I would not trust any tube made in China these days... I found this out the hard way...

You really want new Svetlana or an old ham tube someone pulls from a radio that everyone knows is good. Preferably made by someone we have heard of like RCA. If you do have to buy new, RF parts has all kinds:


I see they have china ones too with a 1 year warranty. It is possible they get the "good ones" while e-bay is selling the rejects... One could call RF parts and quiz them for the "whole story" there.



At 01:14 PM 5/8/2006, you wrote:
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?