Looking for a flyback for a RCA CTC 15

[Jon1967us]

Can the CTC-15 fly be converted for tube instead of the solid state focus?

[Electronic M]

Originally Posted by Jon1967us

Can the CTC-15 fly be converted for tube instead of the solid state focus?

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.

[Yamamaya42]

not to mention. you will be very hard pressed to find a socket for a 2av2 that wont wanna arc out, not too many original ones out there...

[rcaman]

i may have one i will look shortly

[rcaman]

sorry i do not have that one i have one for a ctc-20 chassis.

[dieseljeep]

Originally Posted by rcaman

sorry i do not have that one i have one for a ctc-20 chassis.

That fly is rare, it only works in a CTC20 chassis! 70 degree deflection.
That RCA distributor didn't even have one in stock and that was years ago!
That set was a dog anyway.

[Jon1967us]

Originally Posted by Electronic M

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.

If in the instance you only had a ctc15 fly when your ctc16 fly dies, and you want to adapt to the existing circuit, but this idea seems to make sense as well. Part number? I found this on Mouser https://www.mouser.com/ProductDetail...BIClpyBQ%3D%3D which would probably work... Also, I assume you mount the rect somewhere on the fly phenolic?

[Electronic M]

Originally Posted by Jon1967us

If in the instance you only had a ctc15 fly when your ctc16 fly dies, and you want to adapt to the existing circuit, but this idea seems to make sense as well. Part number? I found this on Mouser https://www.mouser.com/ProductDetail...BIClpyBQ%3D%3D which would probably work... Also, I assume you mount the rect somewhere on the fly phenolic?

That's the same diode I use for focus (I've even used 3-5 in series for HV rectifier duty).
The CTC-15 flys (atleast in the clones I own) did have mounting on the phenolic for the focus rect and 66M resistor. On a stock CTC-16 you could probably use the focus rect socket for one or more of the terminals.

I'd study the CTC16 and 15 schematics carefully before putting a 15 fly in a 16. IIRC the horizontal stages, their windings, and the windings for the chroma burst and H AFC circuits are different...you might need to extensively modify multiple circuits for such a swap to fully function.