Here is my "Super Vibrolux Reverb"... this maintains the 3 tone controls and the "vintage iron" in a 2 6L6 / 2x10 amp. The same can be done with a SF bandmaster reverb.
1966 Super Reverb amp
JD Newell 2x10 Vibroclone cabinet
Weber 10A125 4ohm speakers @ 2ohm load
Here is a size comparison to a DRRI (left) and the "Super Vibrolux Reverb"... (right) and dog (center)