Vintage tube sound from a modern amp

I have a Cary Audio SLI-100. I’m a newb audiophile. My only real comparison was a McIntosh MA352.  The Cary was the clear winner at thousands less. It has more detail and clarity while not getting fatiguing at all. Very happy with the purchase. TheSLI-80 allows for tube rolling while the 100 does not. Decware did answer the phone for me but the wait was 18 months. 
I wanted a system that could slam and rock hard as well as handle jazz, vocals, acoustic stuff etc. Apparently the only knock on the old school 300b amps is that they won’t give you that big gut punch. I’ve never heard one personally. 

The first & certainly one of the all time greats in this category you’re defining is the McIntosh MC 275! “New  & improved”  version sounds Excellent, solid build quality & a timeless design. To me, in its power range of about 90 real watts/ channel ( as confirmed by John Atkinson) , it sounds more like real music than most other amps I’ve heard. Can be used bridged in mono for more power & they just came out with a higher powered version too. 

and The 275 is an excellent amp….   Seeing one at Best Buy the other day all dusty , and left on 24/7  was really sad    The Magnolia up here does a poor job representing McIntosh.  It’s pathetic actually for such an iconic brand 
 
 

Many of the fine examples offered are VERY EXPENSIVE.  The classic tube sound does not have to be so costly.  What's more classic than a Marantz 8 or its downmarket contemporary, the Dyna Stereo 70?  You can buy a brand new one with modern parts and upgraded input circuitry here:

Marantz 8 are costly…..  try finding a nice one 

They are rare ….  I was thinking the Dynaco too but nice ones of those aren’t easy to find and all need work.