The little bit of information I can find on the Internet leads me to believe that these were made by Sano in NJ.
The amp has five speakers - a 15" made by Utah (I think), two 8" speakers made by Excelsior Sound Power in NY, and two side-fired 2" x 10" speakers. (A previous owner has disconnected the two side speakers.)
There are two separate amps inside - one affixed to the bottom and one affixed to under the control panel on top. The bottom power amp has two EL34 power tubes, a 5AR4 rectifier, two 12AU7 preamps, a 6AN8 and a EL84. The top reverb amp has 4 12AU7's.
I couldn't hear the tremolo, so I replaced the 12AU7's in the reverb amp with 12AX7's and the tremolo was loud and strong. However, in idle, the amp was actually shaking and making a whomping sound. So I guess the 12AX7's are way too much gain.
There are four inputs - two for accordion (treble & bass) and two for guitar (normal & bright). Each provide a different tone.
Would really like to find a schematic for this amp.