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RE: I like the Tri/pent for those trafos as there are no surprises.

Posted by Eli Duttman on May 1, 2016 at 10:44:25:
"Would it for instance also be suitable to use this circuit for 45-PP?"

That small signal circuitry can produce something in excess of 50 V. peak to peak, as it takes that much to drive "12" W. tubes and 7591s into clipping. Some extra "grunt" is needed, due to the GNFB loop.

A look at the #45 data sheet indicates that as much as 140 V. peak to peak are needed, depending on the specific operating condition set.

My "seat of the pants" assessment is that you could use that sort of circuitry, IF line stage gain is present.