John Broskie's Guide to Tube Circuit Analysis & Design  19 May
2012   Aikido Split-Load Phase Splitter Although I have covered
the Aikido split-load phase splitter before, here is a quick
recap. A grounded-cathode amplifier stage (not an SRPP stage),
made up from two triodes and two cathode resistors, directly
couples to a split-load phase splitter, which delivers two anti-
phase signals to the push-pull output stage. The Aikido aspect
of this configuration lies in the phase splitter's two outputs
holding identical amounts of B+ noise, which the output stage,
being a difference amplifier, largely ignores, resulting in a
noise-free output. The split-load phase splitter normally has
terrible PSRR (close to zero) at the plate output and a fine
PSRR at its cathode output (roughly 1/mu). The configuration
shown below is quite simple, but powerful. Since the two
identical input triodes share the same valued cathode resistors,
they define equal resistances and, thus, equally split both the
B+ DC voltage and B+ AC rip