I have an old Meissner Signal Shifter and it has a rotary drum for band selection, one 807, one 6v6, and the "eye", (in addition to the rectifiers and regulator). It's in sad shape but might be interesting to bring back to life. The drum has various coils on the other side of the mounting/contact plates. I can provide pictures to anyone interested. 73 Kees K5BCQ