Various things. I mentioned here that "when using tubes of different makes in their own receivers, some TV manufacturers require from the tube manufacturer a label bearing their name and often omitting the tube manufacturer's name". Here's an example of another Thomson tube of the same family (ADT) that has JVC on the label because it's in a JVC TV (note that JVC isn't a tube manufacturer):ChuChu Flamingo wrote:What gives it away that it is that? What do those numbers by tube type mean if you don't mind me asking.
https://wiki.arcadeotaku.com/w/File:A68ADT25X01.jpg
And here's a Thomson tube with a Thomson label:
https://wiki.arcadeotaku.com/w/File:A68ADT27X05.jpg
Note that these labels as well as yours have EIA 553 which is Thomson's EIA source code.
As mentioned in the first link, a tube with a family code starting with the letter A (ADT in this case) is American (Thomson is a European group but they took over RCA tube business in the 1980s). Toshiba tubes cannot have A as the first letter of the family code.
That's not even enough because that number is missing the yoke designation which would come after the X so you can have two tubes with that number that have a different yoke. Such is the case of MS9-29 and MS2932.ChuChu Flamingo wrote: So if you want to say replace a Egret 2 monitor which has a tube # a68kju96x iirc, the donor has to be that number as well?
It's not true because there exist flatter (but still curved) Toshiba tubes like those used in Blast Cities. In Europe one of the TV makers that more often uses Toshiba tubes is Grundig. This model has the same tube as a Blast City but a different yoke.DejahThoris wrote: ArcadeOtaku threads state that any Toshiba-branded curved tube should fit the bezel. Whether that's true or not, who knows.
http://hpics.li/afada4e
http://hpics.li/1bda509
http://hpics.li/d51ea31
I've never found a TV with a tube that would fit an Egret 2 (and so far I've opened up nearly 6000 TVs).