I really liked that last word about SVT's needing more than
60 secs. to warm up!

Actually, even though it may be my imagination (doubt it)
both of my all-tube rigs, my Boogie and V4BH really get it on when about midway through a 45-min. set, the tubes get HOT! I believe there must be a relationship between the tone and resonance and the tubes heating up! I'm sure an Engineer could (try and) argue me down, saying "it can't be so"-
but when the amp gets hot, the tone projects a lot more= Then again, maybe it's ME!
Other thing I wanted to add a BIG +1 to is the sound in the live mix. And I think that this may hold true for Ampegs especially... I've got a V4BH and a 3PRO. Some mis-guided

players feel that the Ampeg tone is too dark, too colored, ...
the "M" word- muddy.
Well, play them all by yourself, I can imagine why someone would (mistakenly

) think so...
But IME, let the drums kick something in, let your guitar player or keys start the song or a vamp, and then...
Add Ampeg Bass tone!
Better than s-e-x!
When the music starts hitting it, THAT'S when the Ampeg tone, especially from the flagship SVT all-tube head becomes apparent.
Hard to imagine ayone not digging that sound and feel....