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Re: UL is cheaper than properly implemented true pentode.

I think there is a flaw in your logic.

A screen supply for a pentode can be as cheap as a couple pieces of wire and an r-c (with a small capacitor) section. If the maker was looking for the cheapest way out, then they certainly wouldn't invest in a sophisticated (read:expensive) screen supply. They would use a cheapie supply.

The taps off the OPT are not free - they don't cost a lot, but they do cost something.

So the cost difference between the two approaches can be negligible if the maker so desires.

And if U/L is just cheaper and offers no advantages, why do you think Stu Hegeman used it in the Cit II?

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