When I put the three 24-A tetrode RF tube back in their sockets, I found that the tuner hit the tubes when rotated. Even the metal retainers didn't really help.
The radio was not designed for 24-A (ST) style tubes. I compared an older 224 globe/ balloon style tube. It is narrower in the region of the tube was being bumped.
After repairing this radio, based on its' tubes and components, it is has model 5AC chassis.
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