Often you will run across a series of CRTs which had different inputs for different sizes or models of the same series. The manufacturer will exclude certain "premium" inputs from the back of the CRT but left the hardware inside the same. This means the hardware inside still supports adding those inputs if you do the wiring yourself. Sometimes its even easier if they left headers for the connectors to be added and did all the wiring for you!
The method will differ from every CRT and therefore a universal documentation can't really be made. If you see a Composite or Video input on your Chroma Chip in the CRT schematics, your TV supports Composite input. From that point you just need to order a female RCA connector from Mouser and run the wiring yourself.
List of CRTs which support adding Composite
Partial list:
- Magnavox CG3920 CH01
- Magnasonic GCT 6012
- Sharp 13H-M60
- Sharp The Searcher CT-6001
- Panasonic CTN-1061R
- Panasonic CT-10R11S
- Panasonic CT-20R11S
- Zenith Cherry DeLight C0920D
- Zenith Licorice DeLight E0930S
- Zenith Licorice DeLight C0930S
- RCA E09344
- GE 7-7660B
- GE 09GP344
- GE 13GP341
- GE 7-7650A
- Sanyo DS25230
- Emerson TC0917
- Emerson TC0916
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