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Old 9th Oct 2021, 10:46 am   #4
dalekmoore2007
Pentode
 
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
Default Re: 5FP7 project starting with the focusing coil.

Hi Adrian !
I see we are very like minded on the CRT interest ...Nice tube .
Below is my you tube channel top line my NBTV SSTV system 240 line with a very low frame rate keep it all in audio bandwidth .

https://www.youtube.com/channel/UC9e..._E3FpVgyObW8LA

Yes as you know i too with valves are trying the same sort of idea my tube is faster than yours ..

I infact had your CRT tube about 1990 before i moved to Melbourne and made a SSTV with it ,it stated out as a failed project by another constructor who gave it to me , so i didn't have to wind the focus coil thank goodness ...but it sort of put me off focus coils as i found after a bit of use the coil heated up a bit and would defocus the raster spot a bit .
i think it would of needed more turns to fix this .

I would work on deflection easy to burn your CRt with out this .or run it very defocused.
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