Not that I share your enthusiasm for Tannoys, but I have heard quite a few in my time, in a variety of systems.
Regard my opinions as objective rather than subjectively rose tinted.
If you want "good clean bass, thunderous bass " then forget smaller valve amps, SETs, 300B etc.
You need summat that will get a good, clean grip of those large drivers and not let go.
Highish current, decent damping factor solid state (50wpc minimum), or valve with
serious muscle (if you can lift it without grunting, then it ain't right for you
).
And (as you know!) it is best to hear them for yourself in your system if you want to avoid the boxswap merry-go-round.
Get your mates round, hold an amp bakeoff. Try a few. Get some loaners.
Good luck!