"Troglodite" wrote in message
...
Note that some tubes cannot be operated in this mode due to screen voltage
limitations. The 6146 is an example. If you wanted to run these in UL
mode,
you'd need a separate winding on the OP trans.

Well, it's rated for triode mode, but it'd be much better to have a seperate
25% winding, or parafeed from the same tapping. (I presume you'd want a
similarly lower AC screen voltage when reducing DC voltage. Example, +600V
plate and +300V screen, with around (theoretically) 500V peak swing on the
plates, would give 250V peak swing to the screens, nearly cutting them off,
i.e. triode mode, if ran from a typical approx. 50% UL tap.)

Tim

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