This one has come about due to my 60s oscilloscope BWD 421A mains transformer kicking the bucket and i am unlikely to find a replacement so pretty much junk and now spare parts to me ..nothing lasts forever as they say .
So been studying up on the GEC 1025H cathode ray tube,its the same tube as the 1000 H used in the D 43 Scope pdf posted apart from a different phosphor
its also equivalents are CV8299 SE4D31 what phosphor they use i don't know mines Green as in the phosphor PDF below .
This double gun cathode ray tube with spiral helix PDA was made by GEC-MOV. Also used in the Telequipment D43 scopes.
The tube 1074H is the same tube with different phosphor.
GEC CRT numbering system:
first two digits= screen size in mm =10
next two= screen type. 24 or 74 or 25
24= short, green, as P31 or GH.
74= as 24 with Aluminised screen (by adding 50 to phosphor type)
the 25 screen is short, green-yellow, as P2 or GL.
Letter indicates tube type/characteristic. H = two guns, with PDA.The CRT is of interest dual deflection as it will push me to learn how to tame this Beast thus the name
Rather interesting Tube with 2 guns 2 sets of deflection plates for the Y The X i think it uses one half for either gun or perhaps you could use both for one gun ,unless i am misreading the D43 scope schematic .
So 2 EHT supplies also needed for this and some other supplies as shown in the D43 Schematic and data .
The Mu metal screen was rather grubby so cleaned that and gave if a paint job for the New Project ,i also had a case large enough to reuse for this
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Now the Tube needs to be mounted as its not safe with these power supplies ,so this step is where i am up to took a little while to work out the best way with the case i have .
The 2 silver panels and hidden door panel will hold the controls ,still need to cover holes back of case .
This CRT is all experimental depending on how well i can control it will depend on how it ends up ,what i would like it to do is similar 2 the 240 line 2 hz frame rate test on the Devil monitor but horizontal scanning so something like 120 180 240 line frame rate select ..using low frame rate i can use the audio bandwidth of my PC to display higher quality which would be lost trying a higher frame rate also the phosphor is a little longer so more suited to a low frame rate ..any case if it gets to this stage i will play around here.
I forgot if i can also do a dual display i will do something similar to the Binocular monitor but unlike having a sperate CRT for the scope and have a scope display below the video image on the same crt ,well want and can do depends first up if i can light this Beast .
OH well Fingers crossed one hand behind my back and here we go again ...
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.