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It uses 2 silicone diodes for the rectifier.
All it needs is a new 6FD7 tube and it should be back up and running again.
I would've bought that set, myself. It was the TOTL for a 19" that year.
If you have a 6DR7, IIRC it is a sub for the 6FD7. At least, you could try it, until you get the FD.