Hi,
A disadvantage of tube rectifiers (except for guitarists) is they
severely limit the value of the first power supply capacitor.
So for hifi it makes the power supply more complicated,
but for guitarists the rail droop is all part and parcel of
the "soul" of the valve amplifier.
I'm only a bass player, but have an ancient Traynor
15W valve bass combo, I completely understand.
FWIW the best bass rig I've ever played through
was a Fender Bassman 130W and a Traynor 4x12.
This thing near maximum volume did amazing
things depending on how hard you played. I
could try and explain why technically, but
that is not the point, playing it was great.
As a one off, I just enjoyed how good it was.
The sound accentuated (compared to what
I was used to) what I was doing in a good
way, and the feedback just spurred you on.
I guess that is my example of the "feel" of
an instrument amplifier, the way it responds.
rgds, sreten.