Is it possible to buy a decent tube amplifier in the $2000-3000 range?

Overdriven amp is never a good idea, either ss or tube, even if the latter can be more tolerable. Amp should always have reserves of current and power. 

I investigated Rogue amplifiers.  There is a hybrid tube/class D "Hydra" model for about $3000 that I'm considering.  
Any opinions?

Had a Conrad Johnson pv9a with the mvs55. Needed a little more power and compared the rogue to prima luna.

I for one preferred the Rogue audio cronus magnum ii to the prima luna. Great amp and made in pennsylvania.

I think the Rogue more powerful  "Medusa" costing $1000 more would be better.

Imo get rid of the speakers. They are not efficient; they are like pushing a brick, like a Magnepan. It would take a crapload of power/current to make them sound lively. By looking for an inexpensive tube amp you are setting yourself up for marginal improvement. They are, of course, lovely in terms of nostalgia, but there are far, far better speakers now. You can do so much better in terms of speakers.

Don't fool yourself into thinking the speakers are "all that". If you want a sea change, change the speakers. Or, rip into them and redo them, from crossover to internal wiring to drivers. If you love their appearance that would be worth it to you. But it won't help with valuation of the speakers. 

Don't expect miracles if all you do is change amps. You would get much farther overall by changing speakers, imo. Your current electronics with a more efficient speaker would be revelatory to you. :)