dominicbeesley wrote:Thanks Harry,
I used fairly small plates on the neck of the tube just after the gun assembly. I didn't try on the wider part of the neck as I had the deflection coils working as well as trying electrostatic, also the tubes were coated with conducting DAG.
Ok thats a good reason i was thinking you had it removed testing on the neck just before it angles so you tried just before the deflection yoke .
I suspect you will need to keep the plates at the narrower part of the tube otherwise the voltage you need for deflection will be enormous...
OK either it effects the focus or if you try and copy the yokes position voltages not overly safe now either of those are a good reason it wasn't used .
I never tried the vidicons - I looked at winding my own coils which I suspect would be easy enough to get something working. I should think a fair bit of trial and error would be involved in getting it to work well though.
Well it is pretty hard even with the corrrect yoke focus coil i noticed what that fella said in hes video it look him years to work out the deflection yoke was wired wrong and he was canceling out hes yokes deflection .
I keep meaning to get round to doing all this stuff but at the moment my workshop is piled high to the ceiling with half finished projects and stuff that had to be put away when we had the baby...also I own an old Land Rover which eats all my spare time just keeping it running.
OH yes the baby ! you are going to have to help the wife for a bit or there would be trouble having 3 kids you need to plan your spare time in advance a little bit at a time gets you there ...i am lucky my wife lets me do a little project work in the house but i keep it all small small scope small battery soldering iron so on you don't want to push your luck
Hopefully we'll buy a bigger place soon and I can have a real work-shop instead of the coal-hole that I use at the moment!
D
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Good luck a man need s big shed as well or space to build one
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.