Quote:
Originally Posted by Jon1967us
Can the CTC-15 fly be converted for tube instead of the solid state focus?
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Probably, but why would you want to?
All you would need to do to use a focus tube is add a focus winding on the flyback frame using 10KV insulation rated wire.
However every heater load on the flyback increases horizontal output cathode current, reduces HV, and increases opperating temperature of the flyback...All of which are bad things to do.
On sets with tube focus I often disconnect the focus tube heater winding, leave the tube in for appearance, and stick a cheap modern 5KV PIV rated diode in. It reduces load, heat, and stress on the flyback and horizontal system, and improves focus in most cases.
I can give you a part number for a cheap modern diode if you want.