Have speakers need new electronics

BAT has 300 wpc @ 4ohms. Is that enough?

discopete OP2 posts01-16-2019 8:20amFrom what I understand also, is that I want power that is stable at 4 ohms for these speakers correct?

Correct as it’s said they have a similar impedance/-phase load as the 608’s, which dip down below 4ohms, in the power region of the bass and up in the presence region in the upper mids. So you’ll need an amp that is happy seeing loads of 3ohms. And because the F206 are 88db efficient around 80 rms watts or more into 8ohms at least.
I’d steer clear of tubes unless big ones with low output impedance if you want the best out of the bass eg: < 0.5ohm eg: AR D-115 would be a good oldie for them.

https://www.stereophile.com/images/714R208fig1.jpg

Cheers George

Steve gave an excellent recommendation, the PS Audio gear gets rave reviews (and measures well too). 
 

Discopete: I live in Medford; if you’re down this way in the near future, please stop by for a listen. My Thiel CS 2.4s drop to minimum 2.73 Ohms and stay below 4 Ohms for most of the frequency band. The PS Audio amps have no problem with that load.

 The new Kinki Audio Ex-M1 integrated will put out 400 w.p.c at 4 ohms, is well below your budget, is extremely well made, and sounds like it should be priced at two or three times its cost.