In my case they did not make any difference in my tube phono as well as tube phono preamp. They did eliminate a strange ticking noise that my tube power amp was making.
However they made a huge difference in both of my class D sub amps. Tightened up the bass and in one case really beefed up the very lowest octave.
However they made a huge difference in both of my class D sub amps. Tightened up the bass and in one case really beefed up the very lowest octave.