Modular rig, you can also get instrument preamps and chain as many of the power amps up as you require.
This one came without valves but had work done fairly recently:
Preamp photo was a bit blurry,, can’t tell from camera screen, and I’ve put it together again now:
Solid state board runs the reverb. All but one of the pre valves in there were duds. Since two other of these have both required new pre valves when I’ve gone over them, have a suspicion something in these is eating them, but don’t know what. Pointers would be appreciated. On first try the reverb knob just gave a nasty whistle. tapping stuff with a chopstick to try and find it, and a good ding on the reverb tank ‘fixed’ it. Not the issue won’t recur, so guess have to call it fixed.