This from Nelson Pass,
Nelson Pass said:Please note that both the Aleph and Aleph X amplifiers
require that the negative rail of the front end requires
the same voltage connection as the output stage.
The only thing you can gain with a separate + supply for the
front end is perhaps a bit less noise, but even then you can
achieve this with some decoupling to the supply rail which
powers the current source for the input diff pair.
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