Eric,
Darned right it gets confusing. Especially for us entry level old timers. In the floor bakelite consolette I have two models. One has green mask around the 10BP4 and has two chassis like the 30A13 above, but slightly newer design, with 5 or 6" PM speaker. The other floor consolette also in the same bakelite case has a gold surround the 10BP4 and a single chassis, 5 ot 6" PM speaker. The same chassis as in my 10" bakelite tabletop, but that has EM speaker. Both single chassis models use a 5U4 sticking out the top of the power xfmer (I seem to recall).
I could never keep all the Admiral chassis numbers straight in my head. Say 19A11 and I immediately know what you are talking about. 30A13, yes most of the time i'll remember. 24AX12, I scratch my head and nod like I know. Beyond that.
Rob