Hmm, since most Valve Amps that permit Power in the 20
Watts range and
upwards are PP Amps, there must not much complexity added to have
differential inputs, there are Phase Splitters that can use both
variants. Only for SE and preamps some Input- and Output transformers
must be added, and that are the expensive things this days...
Yes...
...finally t simplifies to: who want's to pay a little more to get a
better result?
Well, I'd rather pay more for some good enegineering, like differential
inputs and outputs (which will reduce common-mode noise signals for good
engieerign reasons that I can understand) that pay for good-lated fuses,
carpet groudnign clips, special mains cables, etc that have no science or
engineering behind them.
Look at that RCA Jack alone, it is really cheap and it is the source of
many many Problems ... There are really better things out here.
XLRs spring to mind...
Mind you, I find the audio DIN plug to be worse than the RCA phono.... To
be fair, both are sueable if you get decent-quality ones (gold plated
constacts, metal bodies, etc) Both are horrible if you get cheap ones.
And you can guess what most manufacturers use.
-tony