F7,
Given your listen taste are geared toward Jazz and female vocals there is hope although not cheap...
I currently run my 3.6R with VTL 225's that run in Class A Triode mode only. Midrange and highs are very sweet with plenty of air. Although these amps have very high current I could still use more power for those last octaves to come out. As mentioned getting large amounts of Class A tube power is not cheap. Used Wolcotts are below $6000. VTL depending or year and mods are in the similar price ranges.
Depending on your room size a smaller 200 watt tube amp will work nice. For the MG1.6 100-200 tube watts would work well as for the 3.6R 200-500 watts would make them that much better.
Good luck