UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - CRT is brighter to one side [Hitachi CTP213]

samjmann · 16th Dec 2018, 7:08 pm

You're right in that WV stands for working voltage. In this instance the capacitor is rated at 160V.dc So there there should not be any more than 160Vdc across the capacitors terminals. Much more than this and the cap' is likely to rupture or even explode! Simply choose this voltage or higher and you should be OK.

Back in the seventies I used to service these sets. The thing was that they hardly ever went wrong. Hence 'common faults' that we can remember now were few and far between. What I would say is if the line driver capacitor is failing, normally one side of the the picture is squashed and compressed, and it will make the line output transistor run hot or fail. From what I can see from your pictures, the problem would be in the RGB output stage, of which there are references earlier in the thread.

Please do be careful with these sets, I've lost count of the number of shocks I got over the years with 'live chassis design'. SJM.

16th Dec 2018, 7:08 pm	#90
samjmann Heptode Join Date: Feb 2014 Location: Nottingham, UK. Posts: 648	Re: CRT is brighter to one side [Hitachi CTP213] You're right in that WV stands for working voltage. In this instance the capacitor is rated at 160V.dc So there there should not be any more than 160Vdc across the capacitors terminals. Much more than this and the cap' is likely to rupture or even explode! Simply choose this voltage or higher and you should be OK. Back in the seventies I used to service these sets. The thing was that they hardly ever went wrong. Hence 'common faults' that we can remember now were few and far between. What I would say is if the line driver capacitor is failing, normally one side of the the picture is squashed and compressed, and it will make the line output transistor run hot or fail. From what I can see from your pictures, the problem would be in the RGB output stage, of which there are references earlier in the thread. Please do be careful with these sets, I've lost count of the number of shocks I got over the years with 'live chassis design'. SJM.