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You don't gain anything with the 57s, although they are a more durable tube.



Cheapest = !not_the_best


To each his own.  The guy who buys 5 sets of 811As (at HALF the price) is better off than the guy who purchases a single set of 572s how?



--Toll_Free


I'm just a dumb CBer who runs a pair of ceramic tetrode 15,000s, though.