Best amp for Von Schweikert VR4SR mk2?


What is the best amp for VSA VR4SR mk2? $3000-$4000 USED
Thank you
ellyjr
When I owned the Von Schweikert VR4SR mk2 I used a Pass Lass X350.5 Amp. The VS seemed to require quite a lot of power. By that I mean the Pass meter really bounced even at moderate listening levels.
Thank you for all your response. Glenfihi What Mac are you using? Ejlif I had the JC1's I like them except for the heat and reliability issues. Anybody here using or tried Spectron Musician 3 mk2 Signature?
I have Spectron mono's with my VR4-jr euro-mods. I started with a single stereo amp with bybees and vcaps. I was real pleased so I added the other..probably overkill for me but I couldn't resist. The Spectron replaced a Bryston amp..I couldn't believe the difference. I think Spectron used to be Albert's go to s/s amp...now I think Channel Islands took that spot. Even knowing that I don't think you can better the Spectron. Very smooth when coupled with tubes upfront.
I used to have a Pass X350 my VSRs (not the 4s, though) and really liked it, especially in the mids, highs, and with percussion. Great purity in this combo. No tubes in the chain, but it sounded fine anyway, kind of tubey.