I did try netralisation caps (grid to opposite anode) on a differential splitter using 12AX7.
I could'nt get it stable, always ended up with an oscillator. I think I was using a cap of around 10pF which was probably too big.
Cheers,
Ian
Its hard to get a 12ax7 stable at the best of times.
I have often resorted to 12au7's to fix instability.
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