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I would definitely like to replace the caps in the modulators. I'm new to soldering but I have a big stack of DOA units so I feel this would be a good place to start. I'm just hoping there aren't a lot of surface mount caps due to the compact size. I'm not ready for SMD yet.
I have noticed some waviness in all of the modulators I have, generally diagonal lines. That was mostly viewing on a '79 Zenith though, so some of it could have been the TV. I was going to check on my KV-25XBR, but I'm about to leave the office and already shut off my headend so I'll look tomorrow.
Something else I noticed is that a couple of my 80s era portable color sets, a GE (similar to some Performance models but it doesn't have a model name) and a Sharp Linytron both have problems with channel 2. Linytron doesn't tune channel 2 at all, and on the GE, the color goes out intermittently on channel 2 only.
I still haven't got to trying UHF yet. I'm waiting to finish tweaking my VHF channels first.
Is there any equipment that I should consider getting in order to test and set up my equipment? Right now I'm just eyeballing, essentially setting things to the lowest I can without seeing issues. I'm not sure how sufficient that should be in order to get the best quality, but in regards to the issues that I've been facing, like ghost images in adjacent channels or diagonal noise in the signal, those didn't really seem to be significantly affected by things like amp or modulation levels.
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