silvertone issues with setup

[timmy]

hey guys was wondering with these roundies like the silvertone i have and it seems to be the same with most when setting them up and you cant get the color lines in the setup mode. like in setup when the 3 color adjustments are advanced you should be able to see the line but it seems that most have the problem where one color dont show up. so what could be some reasons for this as well as having to use the bias adjustment all the way up and then you get the drive lines across the screen but lower the bias and the lines go away but your left with a dark picture. i dont think its a bad boost diode all the time since i have changed the diode and still had the same problem and the tubes are fine. so would there be a specific resistor in a specific place to look into when it comes to something like this. where is the best place to check boost voltage without taking the chassis out and im sure it should be around 700 volts. making sure tubes, crt, and electrolytics are all ok what else is known to do this in these old roundies. and one more thing excessive hissing from the hv cage, new hv reg tube, new flyback, no sharp edges on the solder for the rectifier tube. i will try a new rectifier tube which may be alittle weak but tests ok and there is no dust at all , super clean and the hv is set to 24.5 kv. thanks guys