This ought to be true in most HP amps out there but there may be exceptions and possibly (I wonder if anybody ever investigated it?) some parasitic coupling too

This ought to be true in most HP amps out there but there may be exceptions and possibly (I wonder if anybody ever investigated it?) some parasitic coupling too. https://news.ycombinator.com/item?id=13014435#13018118 https://news.ycombinator.com/item?id=13014435#13018118