Re: Rivera amps....
Had a Rake head many eons ago....sold it to a friend, he funny enough sold it to my cousin....who after a few gigs blew it up

Now it sits in a closet, have done so for 14 years now I belive!
Bought it with the matching 2X12 cab, took out the org speakers and stuffed in some of my old Greenbacks.
Changed the tubes...fiddled and fiddled, got tired of the fiddling(I like to play and not fiddle) and sold the thing.
Not my kind of sound as it turned out!
At CM we used a R55 combo for years......all I ever wanted to do was to kill it

Dry dead modern lifeless sound, good for some I guess, I do not like that sound!
To much fight involved.
Same with a TBR-1 head that I borrowed from a friend.......lots of options....lots of time wasted turning and pulling stuff.....and I was used to racks and making sounds at that time

MIDI and all that crap!
Dunno you have to be into that sound I guess....
Well made amps, does as most tube stuff does(have its own life and all that) but it is a strange dry and dead sound to me!
The same feel as Boogie, Soldano I guess...some love it...I rather not play guitar through any of it.