572B's or 811A's?

[Guy G. Giacopuzzi DDS]

I just returned from a swap meet where a fellow was selling a Collins
30L1 linear.  He casually told me that it had 572B's in it (four of
them)but he was throwing in a set of 811A's.(811's are OEM for the
Collins)  I querried if the two were interchangable, and he assured me
that they were, though  the 572B had "higher ratings".  Now, I used to
own a 30L1, and I never remember it putting out more that 500 watts; my
SB-200 does 600, and on two less tubes!  The 30S1's plate is in the 1400
volt range; the 200's is 2500.  But I've never heard of a 200 using
811's.  Comments?

ggg

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