Amp recommendation to drive Thiel 3.6 speakers


Hello everyone,
My first post here. I''l get right to the point.
I am looking for recommendations for suitable power amp monoblocks to drive a pair of Thiel 3.6 that I have had for 20 years, and which I intend to keep. Let me describe my current system.
Speakers: Thiel; 3.6
Power amps: Manley 250 classic monoblocks (tube)
Pre-amp: Audio Research Reference (tube)
Phono-pre: Audio Research Reference 2 SE (tube)
Turntable: VPI/SME, and Linn LP12
Digital: Audio Research CD3

I am looking for recommendations to replace the Manleys. From what I know, the Thiels are a difficult load.
Thanks in advance
pyma6
I have been considering a used pair of PS Audio BHK Signature 300 Monos, claiming ratings of 8Ω/300W, 4Ω/600W, 2Ω/1000W. Another consideration is a pass Labs X350.8. Not sure if I should stay with tubes or go with SS in power amps.  Some of the original amps that the speakers was tested early on (like the CJ MF2500) are now vintage and I would rather stay away from something that old. I have read reviews of the Brystons saying that they work but they may be better choices to bring out the full detail and low end of the speakers. Some reviews warn about a harsh tweeter with certain power amps. Not sure.
Comments?

Cheers
Achilles
Krell, Levinson, Bryston, Rowland, Boulder, Ayre.  Preferably from the same era.