Honestly, those 84 based Marshall clones sound nothing like "the" Marshall tone. They're cool enough as their own thing...I have a custom 84 amp that marries a Marshall inspired preamp with a class A voxy power section.
...but, you need an el34. it depends on what you mean by small. My Reinhardt Storm33 with power scaling allows you to dime out the 34s and bring it back to where it doesn't shake the walls. At the same time, the guy who built my custom84 has a single ended 34 like 10wt amp that is like a mini Plexi--you have to open it up...but, when you do, the neighbors don't call the police like they would a full Plexi.
But, IME, you need 34s for "that" sound. Plenty of other nice grinds in the world...but, if you desire that classic rock thing, you need 34s.