I'd say home brew, or at least home build. The EF37A/6V6 3-3 clone sounds good if you fancy a retro look- you have a potential choice in either valve of straight sided cylindrical or classic bottle outline, plus a nice red jacket on the EF37A! In fact that's one of those "now there's an idea" suggestions that might fit my junk box stock (except for the O/P TX)
The original EF86/EL84 3-3 would be more suited to building in the same style as your existing amplifier, though.