Von Schweikert VR2 complimet integrated tube Amp

I'm buying VR2 and like the sound of tubes but have limited
bucks. I was hoping to find a used integrated tube amp
that would work good with these speakers. Mfg recommends
100 watts? It needs to be clean and responsive and well
rounded. I tried some Antique Sound lab AQ1001 DT integrated
amp. It did fine on jazz and vocals, but when I put some
fast paced Robin Trower on it lagged and din't sound as
good as non tube amps. I also have lot's of records
as well as CD's. I'm at a lost given limited funds.
Anyone can suggest some units to look out for.
Thanks Jim