66 rca new vista

[Penthode]

Originally Posted by timmy

hey guys just a quick question i have a 66 rca new vista that i recapped but from day one when its turned on the screen lights up bright the way it should and sound is present but the picture is like all white and during about 20 seconds the picture fades in perfect. could this be a video output tube that is taking alittle longer for the heater to heat or lagging behind the other tubes. because i have had 2 of the same tubes and the same result testing and one would take longer to show a result then the other. call me crazy but was wondering... thanks

I don't think it is the video amp delay heat up. Note the video amplifier tube drives the CRT cathodes and if the video amplifier conducted late, the CRT would be cut off.

Have you done a proper grey scale? Eg the screen controls minimized, and then the service switch, adjusting the screen controls for the barely visable lines?

Try measuring the CRT grid and cathode potentials when the set is switched on and as it powers up.