Originally Posted by Drew
mine is 50w but it's doable at a lower wattage.
If you just want something small though I'd look elsewhere as it loses its character when you drop the wattage.
There's a 3u rack preamp kit called anvil that I think musikding sell though if you want a slo.
Is possibly look into the ceriatone stuff though. There's the son of yeti which is roughly 20w dual 6v6 that covers pretty much any kind of Marshall tone you could want and that's about $500 for the kit I think.
I also think there's a 20w silver jubilee type amp coming soon too.