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RE: You could run that tube in ultralinear mode

"If the tap is placed properly you get triode linearity."

With a beam power tube or a power pentode, even wired in triode you don't get triode linearity. Wire UL they are less linear than if they were wired in triode mode but as I said, even wired in triode mode they are not as linear as a true triode and further away from the linearity of a direct heated triode like a 45, 2A3, 300b or 845.

Here's a 6550 in UL mode. You might be able to improve on this by changing the tap location but it will never be as good as when triode wired.



Here's a 6550 triode wired. Do you see how much more linear this is vs. UL?



Here's a 300b. Do you see that it is more linear than the triode wired 6550?




The bottom line? You can not get triode like linearity from a beam power tube or a power pentode. No matter how you hook it up.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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