07-10-2021, 06:27 PM
The eventual plan is to build a valved old fashioned SSTV/NBTV monitor using this ex RADAR tube for the display. It is also a learning exercise for me, in that I hope to understand more of the principles of electro-magnetic deflection.
Although I believe, a LOPT will not be driving the scans for such a slow unit I also want to understand these better and how they work and are calculated etc. So as time goes on expect lots of questions that may seem trivial, but please understand before taking up the hobby I was not a TV engineer.
The coil former was turned from black nylon, 42.35mm diameter and 52mm long where the wires will go. I then parallel wound 7000 turns of two 0.16mm dia, enamelled wire, giving a max rating of around 12mA.
It takes 66mA to focus the spot at 2KV EHT and 82.5mA at 3.5KV EHT. Scan coils and static deflection to follow at some point.
Youtube video.
Adrian
Although I believe, a LOPT will not be driving the scans for such a slow unit I also want to understand these better and how they work and are calculated etc. So as time goes on expect lots of questions that may seem trivial, but please understand before taking up the hobby I was not a TV engineer.
The coil former was turned from black nylon, 42.35mm diameter and 52mm long where the wires will go. I then parallel wound 7000 turns of two 0.16mm dia, enamelled wire, giving a max rating of around 12mA.
It takes 66mA to focus the spot at 2KV EHT and 82.5mA at 3.5KV EHT. Scan coils and static deflection to follow at some point.
Youtube video.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve