He-he Frans, amusing definition of sounding ..... with "hair", I had year ago hair length 60cm almost
So, yes it`is surprisingly for us why many manufacturers experimenting with different modes and circuit topology, transformers, another manufacturers removing transformers for transformerless sounding or saving for transformer cost (the manufacturers solid state gear installing transformers
back 
though it`s not necessity for solid state devices anymore, only for coloration and transformer sounding.
But pity
we not understand why manufacturers mostly install same tubes across all devices and industry, 12AX7, AU7, AT7 and so on, though from diverse brands.. but...
enough, more than
enough... We know this sounding very well, and you know of course.
We never installed these tubes and never will install. It`s good tubes .... for guitar gear.... but it`s existing a lot of much more perfect tubes for preamps, compressors etc... one set from which was loaded into your haired preamp... (
with qualitative long-haired gremlins of course 
)
Many nicely and original types of tubes are existing except of 12AX7 and others 12 with standard damn sounding which is such very recognizable.....
