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Find yourself a small screwdriver. On the back should be several potentiometers ("pots") that will adjust aspect ratio, linearity, horiz, vert, color etc. Don't touch the color adjustments, but if you adjust the linearity and others while watching it, you should hopefully see the picture improve. If it is a truly old crt with tubes/valves, it is more likely that a tube/valve is going south and should be replaced. If not (and the adjustment doesn't work), it is time for a new telly.
Hehe, only an extremely rare vacuum tube hobbiest would have one of the old sets you mention last. TV was only allowed into SA in 1975, and all TV's range from only transistor to VLSI. I know the pots on the back, but I've never found one connected to interlacing. And, oh yes, I have learned well enough to stay away from the colour ones.
I know the pots on the back, but I've never found one connected to interlacing.
There would be no "interlacing" control available to the user on CRT TVs, if you're lucky you'll see 'vertical size' and a 'vertical position' on the back of the TV - try with those two first, if it doesn't fix the image on screen then you could be having a vertical linearity problem and that needs to be fix on the board of the TV.
Old sets with discrete components will have trimpots for those adjustments but newer designs will have an IC doing all the vertical deflection footwork taking a feedback signal to correct itself, usually a resistor will handle that; some fancier designs have an active component attached to the deflection yoke for that purpose (thermistor, a diode, etc).
How about an electronics shop for a modern TV? CRTs are power hungry, unwieldy, have a poor image, and make that horrible whining sound.
It sounds like some piece of the timing circuit for the sync has gone. If that's on a chip, you're screwed. Otherwise it's probably a resistor or capacitor on the circuit board that has blown, but finding which one will be very hard.
CRTs are quite dangerous; they have a HT circuit inside and that can maintain a pretty high charge even when you've turned it off. Be very careful if you're going to try any self servicing.
True, one ends up spending a premium price for the Dell. I like to think I'm paying for reliability, but as you've mentioned, I'm sure you can get that today without paying a premium. A couple of things I've liked about my Dell laptops are the 1920 x 1200 panels and the 7200 rpm drives.
Wow. The last place I worked had about 115 machines, all Dell. I had to replace the motherboards in 40 of them because of the "capacitor plague", some, more than once. The count would be even higher had I not left. I'm sure the guy who followed me ended up replacing even more of them.
The bad caps weren't really Dells fault. The big problem I had with them was how they handled the situation. They denied the problem even existed for months.
The Dell Inspiron series is very infamous for overheating, crashing, and having components go boom on you. (Too lazy to get a link right now. Currently [still] waiting for Visual Studio 2012 Update 2 to install, after about 10 hours of it running. )
I never have had any issues with things from Radio Shack, and Dell is often overpriced. My new computer cost about half of what a Dell computer with most of the features would cost (The dell had 4GB RAM and a not so good screen, my new computer has 8GB RAM and a touchscreen with full 1080p HD functionality.)
Don't know how old your Dell is, but I have an 2 year old Inspiron in which the motherboard recently died. I was really pissed off and I only had the standard 1 year Dell warranty, so it was 1 year out of warranty. I called Dell expecting to get nowhere with the call centre operator, and was ready to get all shouty and aggressive. However, the Dell employee on the phone fell over himself to help me and offered several options to get the laptop up and running at no cost. I ended up getting a new motherboard couriered to me, popped it in, sent the old one back and the laptop is as good as new. All for free! We'll see how long this one lasts, I have noticed a decline in quality over the last couple of years. The first Dells I bought are still running after 12 years or so. I was pretty impressed with the way they handled my complaint though.