Realistic sound = tubes and analogue

[Sir Terrence the Terrible]

I used to play and had a 100w tube driven Fender Reverb amp. I paid $250 for it in 1981 used and sold it last year for $750. It had certain tonal qualities around the mids that the SS didn’t have IMO. Not sure if that is the same for stereo amps though. Seems like a whole different ball game to me.
FYI,
That thing could heat a small house in the winter.

I think that underlined statement is exactly why they are not suitable for studio monitoring situations. Tube amps have certain tonal qualities, and it would impart them on a studio master during playback. That is not what an audio engineer is looking for in a monitoring system.