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Re: just a thought...

64.12.116.6

I don't think its primary effect is applying NFB. It is more like modifying the pentode characteristics a bit. It makes the pentode a lot less senditive to the applied load and g2 voltage.

If one takes the U-L as applying NFB to a pentode, the arguement that a triode is a pentode with NFB becomes a whole lot more believable. The triode being the case where the g2 is attached to the plate or 100% U-L taps.

The distaste for U-L can probably be traced to the amps that first used it. Their designs left a bit to be desired from the POV of an inspired builder.

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