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It could be a trivial thing. I injected a composite signal directly into my RCA 721 with no issue and ended up with a high quality picture...an order of magnitude better than through the tuner.
I do have a pretty good idea of how the signal is going through the IF and being filtered and modified but there are certainly aspects of getting a decent picture I don't understand.
I'm getting 3 KCS28 parts chassis in about a week plus a NOS 10BP4. I definitely want to replace the brightness control and I want to proceed carefully knowing I have a ready supply of replacement parts. Two of the traps I got from Bob are like most of these...stuck slugs that need a bit of mineral spirits to get them working but even with lubrication, they don't turn all that easily. The other issue with the slugs is a lack of robustness in that the iron slugs are solid but the threads, and I use that term lightly, in the coil tube are very susceptible to damage. They're not really threads but more like cuts in the inside walls of the tube every 90 degrees and it doesn't take much to strip them out. I can see why manufacturers quickly went to sticking a threaded rod in the slugs and made it ride up and down in a metal channel in the top of the can.
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