Tube amps under $7500

@audphile1  Rogue now definitely on the list. Had forgotten about them but I do know a dealer pretty well.
@biglou13 , If this means I am wasting my time shopping under $15k, well, so much for the experiment. You did notice I am talking amps, not preamps?
@hilde45  Know nothing about Quicksilver; will research & explore before making any decision.

@curtisvill I am not thinking integrateds at this point as I like the flexibility of separates. Maybe when I enter downsizing mode in a few years.

@hickamore look on a used market. The ST-100 is around $2,000. 
Audio Research would be another recommendation. 
In any case, consider a matching preamp for synergy if possible. 

@hickamore,

Maybe Atma-Sphere M-60 see here! 😎

Mike

@audphile1 Just learned that user must re-bias ST-100 tubes every 4 months. Hmmm, yeah -- one of several reasons I have avoided tube amps. Current Prima Luna 400 has autobiasing. Not sure how well it works, but if it does .  .  .

I did it several times on the ST-100 when I had it and it’s super easy to do. Bias meter is built into the amp. Screwdriver is inside the amp as well. Flip the switch on each tube to “bias”, use screwdriver to turn the pot and look at the meter to align the needle on the proper value. 
It takes under 15min to bias those tubes including removing and replacing the cover.