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Yes that so called contrast control is only adjusting the gain on the 3 IF stages. I don't own a RCA 630 type set, so I'm not the very well versed on it's operation. It would be nice if someone familiar with those TV's would chime in on how that control normally affects the picture.
I'm with you on sending that generator back and going with something vintage. I will however say that you won't get nice clean sine waves and flat frequency response from most service grade generators, but I'll bet many will do better than that unit.
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