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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Pentode vs. Ultra Linear

" He explained that when the plate pulls the top of the output transformer winding towards ground, the ultra-linear tap pushes the screen grid so low that it renders the tube unable to drive difficult loads...."

Winding an OPT with the tap in a reasonable spot takes care of that on amps with HP-race B+ levels. It is a matter of tube choice and OPT design...IOW, U-L amp building 101...which I am pretty sure he did well in, which means what coming from a good designer? surely not, "I screwed up the design"?

It is easier to crank up the g2 voltage on a pentode so the loadline stays where the plate curves are horizontal no matter what the speakers do.
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.


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