I think the Vox amps of the same variety have the tube preamp stage. And this is really what you want for tone.
Or you could buy one of the Mesa/Boogie V twin pre-amp foot pedals (12AX7’s I think) and put it between the guitar and the amp.
My SlideRig is solid state, but it’s designed to to emulate the UA Audio 1176 compressor/preamps that Lowell George used for his slide playing. So tone for days.
I’m going with solid state for weight. Can’t fathom hauling around a tube amp (head & cab or combo). I need a quick set-up and take down with two trips to the car, no more.