1963 RCA CTC-12 Ainsworth (Australian)

[BRC2000]

Hi Chris
I think this is a CTC15 as I have what looks like the same chassis on my bench at the moment.
In 1963 the 14 F 615 MU cost £292 in the UK. I have the documentation for the CTC15 625 NTSC 4.43Mz plus the PAL mod if you need it.
Keith

[rca2000]

I was going to say that myself at the first glance of the chassis---it is NOT a "normal" ctc-12,. they had an octal H-out put tube and a focus rect tube in the cage. But I was afraid if I did say something...people would bitch at me.

[dieseljeep]

Originally Posted by rca2000

I was going to say that myself at the first glance of the chassis---it is NOT a "normal" ctc-12,. they had an octal H-out put tube and a focus rect tube in the cage. But I was afraid if I did say something...people would bitch at me.

I hope not! I was going to say the same thing. It is a CTC15. Like it or not.
The schematic, shows the world of difference, between the two.

[old_coot88]

It's probably preachin' to the choir again, but can't be sed often enough. Always re-flow the two ground stakes on the far right-hand end of the chroma board, to keep the heaters lit on the two 6GU7 tubes (possibly 6FQ7s).
When those heaters go out, the CRT grids swing 'waay positive, driving the beam current into an avalanche condition, severely stressing the 3A3, flyback, and H out tube.
This applies to the CTC-12, 15, 16, 17, and 25 chassies.

(in the CTC-19 and all its derivitives, the DC coupling to the CRT grids was eliminated).

[Fairlane500skyliner]

Originally Posted by old_coot88

It's probably preachin' to the choir again, but can't be sed often enough. Always re-flow the two ground stakes on the far right-hand end of the chroma board, to keep the heaters lit on the two 6GU7 tubes (possibly 6FQ7s).
When those heaters go out, the CRT grids swing 'waay positive, driving the beam current into an avalanche condition, severely stressing the 3A3, flyback, and H out tube.
This applies to the CTC-12, 15, 16, 17, and 25 chassies.

(in the CTC-19 and all its derivitives, the DC coupling to the CRT grids was eliminated).

Thank you for that! I'll definitely keep this in mind when I get the set in my hands. Are there any other common faults with these sets that I should look for?

Chris

[Fairlane500skyliner]

Originally Posted by BRC2000

Hi Chris
I think this is a CTC15 as I have what looks like the same chassis on my bench at the moment.
In 1963 the 14 F 615 MU cost £292 in the UK. I have the documentation for the CTC15 625 NTSC 4.43Mz plus the PAL mod if you need it.
Keith

Thanks for that! I was wondering, as I was told it was a CTC-12 (and it the cabinet looks like one from Google), but the circuit diagram has "CTC-15" on it.

Chris