Looking for a flyback for a RCA CTC 15

[bhegges]

Question on using a new silicon diode for the focus rectifier vs original tube diodes. I like the idea of removing the heater current from the flyback, is there any concern around an increased focus voltage or the change in reverse resistance?

To further "lighten" the load on the flyback is there any reason not to use a silicon diode for the HV rectifier too? Note I understand there is a line to where you should just get a modern TV, but flyback transformers are getting hard to find.

I have also seen they use to make solid state devices that plug into the tube socket but I had thought I read they are prone too fail and it is just better to keep using a tube, not sure if that is because they were selenium, wrong ratings, or just 50+ years old.