I gave one of those to the Vortex a few years ago.
IIRC they made several styles of those turret coil assemblies. the choice was center link, or the coupling link at the "high" or "low" side of the main coils. They could be used for link coupled plate coils or turned around backwards for link coupled grid input coilz.
The Slab Bacon
Frank,
Having visited the Vortex museum last week I seem to recall that hanging right at the stairs as you head out of level 1.It caught my eye because I have 3 sets of em. Two are in one HB 6l6/807 transmitter. One for the "driver" and one for the "PA"