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Jumping the bridge would only get one the PP's "pure" DC (I hope...), and the question that churns in my mind is, how does the PP's DC/AC converter not mess up the sound?  Yes, there will likely be switching noise, and it is also quite likely that there is some sort of step-up involved, to keep the processing unit smaller.  And I suspect that this step-up is - somehow - the source of the "umami".  If to jump the amp's bridge, then the AC/DC is still in play along with the battery, and according to people who comment online, AC mains and possibly self noises get through the PP balwarks.  Since there seem to be a few people who get acceptable electricity most of the time from operational PPs, and since this aceptable AC may yet scope poorly, where and what is the critical additive factor?  Remember, even the big PP only uses a 7 Ah battery, which is what I use to drive my tiny DAC. And, as Romy graciously pointed out, using a really big battery would fuse the PP AC/DC circuit...

Best regards,
Paul S

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