Narrow-Bandwidth Television Association

I was going to mention this again on my last project page but i am interested in what the hell this CRT i have is so starting this for a Chat and who knows where it will end and don't want to bore those not interested .
https://vintagetek.org/articles-and-scans/

Doing some research on the Tektronix T5640 after reading what i found i have some questions later on it

What it is below
............Part No 154-0418-00 Name T5640-201 Phosphor P201

Link to the Hunt for information

http://w140.com/tekwiki/wiki/T5640

Below is a simple drawing of my CRT wow that's different on any thing i have ever looked into .



Now i looked into the internal graticule it does have a line i can't see a grid that might of just been some plastic screen i would think this was a scope tube may be with Storage memory ? ..i am not to bothered about



Now a Question more than likely Steve you can answer P201 Now i know the P is for phosphor and the number after time in seconds ,Tektronix seems to have a different code 201 ?
EDIT............i just found this ( it can hold the trace for an hour after its been written to the screen ! it says due to its 2 screens it can either be used as a normal scope screen or as a storage screen...in our case of interest this thing might be able to do both SSTV and NBTV depending on what you use...how this is done needs more research.
https://archive.org/stream/tektronix_56 ... jvu.txt....
1963 boy you were right there Steve ...if i got it right you can write and erase to the screen sounds like a great idea for sstv !
5640 in the below pdf

The flood gun is new to me first i have heard of it see pdf below

Ah yes. I'd forgotten about these more exotic devices - and there were quite a few variants, often for very specialised applications. I don't think I'd have a go at firing up, it needs a lot of support voltages and electronics. It's so much easier to use RAM these days. Just as I did in the SSTV-625 up-converter a few years back - which reminds me, I must get back onto the MkIII version...when?...good question!

Steve A.

Steve Anderson wrote:Ah yes. I'd forgotten about these more exotic devices - and there were quite a few variants, often for very specialised applications. I don't think I'd have a go at firing up, it needs a lot of support voltages and electronics. It's so much easier to use RAM these days. Just as I did in the SSTV-625 up-converter a few years back - which reminds me, I must get back onto the MkIII version...when?...good question!

Steve A.

Yes i had never heard of the Direct-view bistable storage tube little did i know i had one in my shed . interesting looking at one working in the video !

Yes life sort of gets in the way of projects sort of when you can on the converter every one i am sure is still interested


youtu.be/QkcVwRKy6Jk

youtu.be/xQfSJeARRpM