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Yes but look at the plate and screen voltage compared to maximum ratings

The example you mention has the plate at 450 and the screen at 400. IIRC a standard 6L6 is rated for a maximum plate voltage of 350 and a maximum screen voltage of 250. So this is a prime example of what I think VTL did. Namely operate a tube beyond it's published maximum rating.

But hey, I am ready to be proven wrong. Actually I'd like to be wrong as this is a friends amp who is having some run away tube problems from time to time.


Russ


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