Where do I get a new tube for RCA 20F424T - 20" CRT TV

SOURCE: Initially No Picture when Turned on but sound normal and 5 minutes later Picture is all RED and then Picture becomes NORMAL (all normal colors)

theres a high voltage block that all three of the anode leads attach to and sometimes a small crack happens across this block and will not let some or all of the crt's get the high voltage all at once untill it heats up a bit. now if this is not your problem i would make sure that all three crt sockets are attached to there tubes all the way as maybe justy maybe there loose and will only work after ther expand a bit. Now another problem that could cause this problem to occor origially would be that someone left off a crt ground strap and the crt arched and popped and caused the problem with the High voltage block. And no I cant see a tube being bad then comming on at first UNLESS when you say the red comes on is the picture all red with small retrace lines(small white lines)in the screen with no picture except for red???? No video only a red blank screen is what i mean. If thats what its doing then yes Ive seen heater to cathode shorts on a picture tube that would cause this problem but to be sure your really gonna need to have the set looked at.. Good Luck

SOURCE: RCA D52W20

Check for smooth,accurate adjust of RGB focus located up front behind speaker grill.If jumpy or inaccurate,replace RGB adust block.If that is not the cure,you may have bad CRT(s).

SOURCE: RCA 52" HDTV DLP tv

suspect the optical engine as the culprit. they can gather dust contamination internally and cause a "faded or washed out pic"

SOURCE: phillips magnovox tv 9p5534c102 55" picture , tube problem

color is reddish and dark

SOURCE: RCA r56wh78 rear projection screen is blurry

I have the same model and the same problem - the picture just started getting slightly blurry, and moving objects get sort of grainy and jagged around the edges. I'd like to try the flyback adjustment you mention, but I have no idea what to look for. Is there a guide or reference that could help with this stuff? Schematics?