You wrote "driving the plate of the first triode" which I interpreted as using the plate as input.
Did you consider using a LTPI, out-of-phase signals applied to opposite grids and using either of the plates as output?
Are you familiar with differential amplifiers?
Did you consider using a LTPI, out-of-phase signals applied to opposite grids and using either of the plates as output?
Are you familiar with differential amplifiers?
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