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I didn't write it, but there is WISDOM in those words!  If a pair of GS-35Bs don't work, go for a pair of GU-84B tetrodes.  That should give you about 8K, be reliable, and if you do it right, run cleaner than a triode amp.  A little more complicated to build, but you get what you pay for.


Either way, two tubes MAX is highly recommended.