Got a 1984 System 3

[jstout66]

at an estate sale this week-end. And I have a few comments and questions for those of you that have repaired these. It's model number SZ2527P, and it's an 84 model. The former owner bought it 6/12/84. So here's my questions. It's a Space Command, with that drop down door on the front door with a touchpad. How do you "add" channels? On the touchpad it has an area that has chn rcl and a skip button. It is set to skip thru a ton of channels and I can't figure out how to "add" them back. You can enter them in directly, but it won't keep them in memory. Also, upper cable channels above 59 aren't clear. Would that be a tuner problem? Also this set has a feature to take 4 antenna inputs. It's got a large input rack bolted on the back, which you also have to plug into AC. There is even an Antenna button on the remote and keypad. What the hell was that feature for? My 3rd question is: this set has a 25VHFP22 inline tri-focus tube. I love the "look" of this set, and altho the picture is "watchable" it isn't really that good. B&W isn't too bad, but the green gun must be a tad week, as you cannot get decent flesh-tones. Also lettering in the corners are a bit out of focus and if you crank up the Picture control too high you get "bleed", so I'm assuming the tube is week. I've seen comments in other threads that the 25" tri-focus inline tubes didn't hold up that well. I have a 1979 19" System 3 with a fantastic picture. I sold System 3's till about 1982, and feel bad if all those consoles I pushed didn't have long-lived tubes. I had the back off and I can't find the screen controls to "tweak" it. I'm not going to use this as an intended daily watcher as I had planned with it's current picture. The Chromacolor 2 that I was using blows this one away..... Anyway, any tips on adding channels and your opinion on having a new picture tube put in this set would be appreciated.