[Arran]

There is a fellow on You Tube (Lockmeister is his handle) that restores one of these, I don't remember whether it was the five or the four band version but search for his videos on restoring one of these. One thing that goes out sometimes, in addition to the usual capacitors and carbon resistors, is the coil for the shadowgraph. They also have an audio interstage transformer which can go open, but this is something that can happen with any set employing a push pull output stage, so check the continuity on both windings, especially the primary. I've worked on a 116 but not a 16, and the restoration is definately a lot more involved then your typical five or six tuber.
Regards
Arran