02-07-2022, 09:49 PM
When I looked at this thread as I went updating it I couldn't believe that it was over 6 months since my last post. So this update is well over due.
I have been dipping into this project as time allows. I have spent a lot of time n it but not a lot to show.
I have finally boxed up my EHT power supply. It was a project that I started over 10 years ago. I wanted it now to test the dog bone resistors that I moulded. I just need to be sure that the materials that I used wouldn't break down when EHT was applied. I have done some test on them at up to their rated voltage 3.5kV and all appears to be OK. I might be able to disconnect the mains EHT transformer and use this EHT power supply for initial testing of the TV which would make it a little safer.
I have rebuilt the tag board that is under the chassis and to the rear of the set.
The chassis had a lot of rust both on the top side and also underneath. In the end it was that bad that I decided to strip the chassis in order to to completely remove the rust.
This has made a lot of work. Pictures are only so good when showing how everything goes back together. Tags and connections can get hidden under components and which pin a wire is connected to can be ambiguous.
So along with notes I have spent time drawing out a wiring diagram to show where each component is connected.
I found that brushing on rust remover took multiple applications and if left overnight it turned into a black crust which needed to be scraped off.
So when I got the chassis striped I cut some J cloths to cover all its surfaces with them. The cloths were saturated with rust remover and left over night.
The next day the cloths had done their job. The chassis was completely free of rust. All that needed to be done was dry the chassis off with a clean cloth.
Now that I have the chassis clean I need to decide how to protect it. I am not keen on painting it. I am considering plating it. Maybe with Zinc. There is no platers that I know of around here so it would have to be a DIY job.
Frank
I have been dipping into this project as time allows. I have spent a lot of time n it but not a lot to show.
I have finally boxed up my EHT power supply. It was a project that I started over 10 years ago. I wanted it now to test the dog bone resistors that I moulded. I just need to be sure that the materials that I used wouldn't break down when EHT was applied. I have done some test on them at up to their rated voltage 3.5kV and all appears to be OK. I might be able to disconnect the mains EHT transformer and use this EHT power supply for initial testing of the TV which would make it a little safer.
I have rebuilt the tag board that is under the chassis and to the rear of the set.
The chassis had a lot of rust both on the top side and also underneath. In the end it was that bad that I decided to strip the chassis in order to to completely remove the rust.
This has made a lot of work. Pictures are only so good when showing how everything goes back together. Tags and connections can get hidden under components and which pin a wire is connected to can be ambiguous.
So along with notes I have spent time drawing out a wiring diagram to show where each component is connected.
I found that brushing on rust remover took multiple applications and if left overnight it turned into a black crust which needed to be scraped off.
So when I got the chassis striped I cut some J cloths to cover all its surfaces with them. The cloths were saturated with rust remover and left over night.
The next day the cloths had done their job. The chassis was completely free of rust. All that needed to be done was dry the chassis off with a clean cloth.
Now that I have the chassis clean I need to decide how to protect it. I am not keen on painting it. I am considering plating it. Maybe with Zinc. There is no platers that I know of around here so it would have to be a DIY job.
Frank
