Hey!
Unfortunately I have not heard a S.E.X. amp, only my Crack w/Speedball. I have a Schitt Vahalla 2, Asgard, Lyr, and several other SS DIY amps..some very, very good.
The mainline IMO after just a few hours of listening and doing some quick comparisons is really on the top of the pile for real musicality....with great songs is absolutley astonishing.
The one thing that steps out (and I hate using those glittering adjectives)...is the resolving "power" or "ability, some say "micro-details".
With the T1's on the high impdeance unbalanced setting, its really uncanny in being able to hear all thats there even at low amplitude.
It seems so "stable, solid, doesnt loose its composure....the 6C45PI is a great tube, ultra linear, and doenst cost an arm and leg for greatness.
The mainline even with 600mw seems to be able to drive the T1's more easliy than the crack. With the crack you have to turn the volume control a lot to get to the higher
amplitudes..seems like the Mainline has more power but its about the same rating as the Crack.
The mids are superlative, voicing is very nice, and the bass is solid, really stable, again depending on your source it will be almost as perfect as you can get, depending on how the bass or ecording was authored in the first place.
I have a wonderful supply of great recordings from a few friends and play some of these "reference" recordings its a mind blower.
If I had to do it again I would most likely just buy a Mainline and be very content,,,but you dont know that unless you try other stuff...reading about stuff is great but we all are different
and hear things abit differently....
You dont hear much about this amp out there in the audio wild, but its definitely a TOTL for me.
Alex
:>)