Amplifier pairing for Altec Flamencos

I am considering adding a new amplifier to try out in my current system and could use some advice on choices to consider that would be an upgrade and complimentary to  my setup.  I have a pair of Altec Flamencos modified with the Werner Jagusch crossovers and play them with my Don Sachs preamp and a Tubes 4 HiFi  ST 120 push pull tube amp. Listening source is Bluesound node 2i with Schiit Modi Multibit Dac.   I have also been utilizing an SVS SB 1000 with them. I am not positive that my current amp is affording the old Altecs the level of dynamics and resolution that they are capable of achieving. My normal avg listening level is 75db with peaks hitting low 90s db.  Though, on occasion, I will go to 11.   What amp will resolve this question? My budget for the amp new or used is up to $3500.  


@fjn04  Thanks for recounting your experiences and impressions and most importantly suggestions on amps to look for.

@alexberger Thank you for your very detailed account of your experience and suggestions.  This is invaluable information! I still have the original crossovers mounted on the original backs.  I may have to  reinstall them to see how they compare to the Werner Jagusch. Who did you use/ who would you suggest that I contact to build  upgraded crossovers for Flamencos? Great Plains Audio? 

@alexberger  Thanks for the Jeff Day page.  I am going to search for a new tube amp based on everyone's input and see what i can come up with.  I will try and update the post once the upgrade is made.

Art Dudley really like his Shindo amp with his Flamencos, but I don't know if one can be had for $3500. What $3500 (actually far less) can buy is a Music Reference RM-10 Mk.2, a 35 watt per channel little beauty of a push/pull class A/B (class A up to about 15 watts) tube amp. There's one on USAM right now.

I really like the Flamencos with my Allnic M2500 px25 tube monoblocks but I also enjoyed them through my Ear890 tube amps. Werner Jagusch crossovers improve the overall sound balance and they also enable mixing of 16ohm woofers with 8ohm compression drivers for the horns thanks to their autoformers.

also highly recommend upgrading the compression drivers to the Great Plains 902 -completely ended my endless search for upgrading my speakers as I’m so enthralled with the musicality of my Flamencos with these two key upgrades.