06-09-2020, 09:28 PM
Hi.
The service life depends on how hard its driven. In sets like the Decca 1000 it is shorter as the tube is run flat out to get sufficient brightness on screen. Smaller projection sets require less brightness so the CRT has a slightly easier life. My old Decca 1000 has a new CRT and run less than 20 hours so is as good as it gets.
I'd suspect with low EHT and using it as a direct view tube it would last a very long time. In fact even running the heaters at 50% reduced supply it is just as bright and still with perfect focus when running at reduced EHT.
Amazing little tubes.
The service life depends on how hard its driven. In sets like the Decca 1000 it is shorter as the tube is run flat out to get sufficient brightness on screen. Smaller projection sets require less brightness so the CRT has a slightly easier life. My old Decca 1000 has a new CRT and run less than 20 hours so is as good as it gets.
I'd suspect with low EHT and using it as a direct view tube it would last a very long time. In fact even running the heaters at 50% reduced supply it is just as bright and still with perfect focus when running at reduced EHT.
Amazing little tubes.
