Steve Anderson wrote:There's a few advantages with the DG7-32, you can still get them and they're quite low-voltage CRTs compared to those that came before, and quite compact. The two I have were as good as new, both in unopened boxes and I was able to get the sockets for them from the same supplier in the UK. I think the paperwork that came with them even has a serial number for each...both made by Mullard from their works in Hammersmith, London...my birthplace by coincidence! Probably around the same age as me, from the mid-50s...
Steve A.
Yes i have one of those thanks to Andrew also still a fair few 3bp1's to use ...i have seen the projects on the forum with the DG7 32 mines still in its plastic bag does not look like it was ever fired up .
I also have a 3AP1A its very long and thin on the electron gun side ...still thinking about that one .
One CRT i have this brute of a CRT..from a scope i would think ,i would love to make a monitor out of it if possible ,i never really looked into it much due to its size and lack of data .
Of late i found this old PC that's died the case it seems has a LCD screen which just happens to be a nice fit for some thing like this monster and the tube just fits.
i would think this is not a low voltage thing ! but i think i am up to what ever it needs now to build some thing like this safely if i find data for the thing ,the Analyst has been useful if any thing working with voltages up to 2000 volts and being able to adjust that to my needs think this thing would be up the 3 to 4kv or more looking at some other Tektronix scope power supplies .
...thinking of deflection supply this must be higher as well 600v a guess might even be low for this thing .
This is one of those cases where you think about what you want to do with it for some time and plan ahead or toss away the idea if its just not possible , reviewing your Brute build some time back the use of valves would be something i have not tried and on a bucket list ,any case i need to find some more out on the type of crt perhaps its just wishful thinking .
ON the current project i finished the second lot of deflection amplifiers and tested that today ,my problem is now the BC547s that control the ramp size also effect the others circuits control this .... comes down to another 2 4040s and DAC ics for each deflection circuit ....then it will work
in hindsight this makes sense so have to rebuild the circuit below ...just the 4 ics part lucky there's room it all just fits on the new deflection board .Yes another oh hum but getting there .
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.