I have a strange one here. A wurlitzer 2910 with a 546B amp (what is a "B" mean?) The amp looks near perfect with a square wave on a scope, but in the juke with that weird speaker set up, it's missing something.
First I found that when the amp is set to Mono, the volume goes way down. Changing the bass treble and balance seem to do not much at all.
Swapping left and right phone input plugs, showed that one channel on the cartridge was real weak. I put a new cartridge in it and although it sounds a lot better, it really acts strangely when adjusting the bass and treble. depending on the other channels settings, if I lower the bass on the other channel, it gets way more bass, I mean a lot more bass! Moving those switches just makes it do some really weird stuff. No rhyme or reason to it. I did clean them and on the bench, everything looked and acted fine. I don't think there is any crossover except a cap on the one midrange/tweeter that I need to replace. The way the treble is sounding, that cap may be shorted. Now that my back is feeling a little better I'll replace it. From the parts manual I think it's a 22uF bi-polar.
What a weird setup. Two different types of 12" speakers and one mid-high range. There is room and even slots cut for another mid-high range but no mounting holes or studs.