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Old 22nd Oct 2021, 9:07 am   #24
AdrianH
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Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 894
Default Re: 5FP7 project starting with the focusing coil.

I do have a permanent magnetic focus unit as well, but would like to be able to do it electrically. I may still have to get hold of some magnetic rings to centre the spot, unless I find a way of using the deflection coils for this as well as scanning. I believe doing the 400 scan lines will be OK with valves, just not sure about the 6Hz frame rate, that seems very slow, even when compared to 50 Hz frame rates.

The mains power supply will be next together with some drivers to get a raster, but, it could be some time as it is a holiday half term here and the wife is now at home.

Forgot to say I have a MW6/2 scan unit and that uses iron wires over the deflection coils, I guess it may do two things: -

1) Possibly concentrate the magnetic field lines into a more compact area as not as much tray magnetic field outside the scan assembly and
2) Lessen the effect of other magnetic fields from power transformers etc.

Adrian
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