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3 reasons why UL is inferior to triode or pentode.

1. It abuses screens by exceeding their voltage and power ratings.

2. It uses pentodes inappropriately. For proper operation of pentode, screen voltage should remain constant. In UL, both plate and screen voltages vary, causing non-linearity.

3. UL achieves lower Zout and distortion via negative feedback from plate to screen; the NFB loop involves OPT. Exactly same effects are achieved by applying global NFB from OPT secondary in most true pentode amplifiers.

If there is any advantage of UL over pentode, I would like to hear arguments. So far I see only disadvantages.

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