Is it possible to convert an R-390A to 100% solid state?

Has anyone ever tried this? I do know there are a couple of projects
out there involving an all-solid-state replacement for the rare-as-
hens-teeth
ballast tubes, but with the increasing rarity of all hollow-state
devices,
I'm thinking about taking this on as a project.

Thoughts?

73,

Rog

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