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Question for the Gurus & near-Gurus.....As I've been playing around with my own franken-amps I've been referring back to the TMB and TC-15 schematics & layouts. One thing I've noticed is that in both cases the phase splitter tail and the pwr tube grid reference resistors connect to the pre-amp ground. I realize that these are proven designs & don't need any "fixing"..... like Bootsy says: "If it ain't broke, don't break it". But from a purely theoretical hair-splitting standpoint, would it be better if they were connected to the PA ground?

As an example, disconnect at the red "x" & connect via the blue line:

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It's best to split High Current Ground Paths from Low Current Paths. The PI / 12AX7 doens not have a high ground current.

So, I always split the two.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Ah...that makes sense. I've seen a few PP schematics splitting the grounds the way I described or that were ambiguous, but I haven't run across any layouts set up that way. Thanks for the on-going education!

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