G07 tube question

obitus1990

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Do all G07-CBO monitors use the same tube type (19VJTP22)? I recently obtained a G07 that is housed in a WGK4900 frame (all the labels are for that monitor), and the tube is encased in some kind of shielding. I can't see the tube number on it, unless I disassemble everything and remove that shield, which I really don't feel like doing. All I can see is a large red RCA label on the tube near the neck because it's not covered by the shielding. The tube could use a rejuve, but before I do it and mess it up due to incorrect settings, I wanted to ask if this monitor used different tubes or if they were all made with the same model CRT.

Thanks!
 
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Do all G07-CBO monitors use the same tube type (19VJTP22)? I recently obtained a G07 that is housed in a WGK4900 frame (all the labels are for that monitor), and the tube is encased in some kind of shielding. I can't see the tube number on it, unless I disassemble everything and remove that shield, which I really don't feel like doing. All I can see is a large red RCA label on the tube near the neck because it's not covered by the shielding. The tube could use a rejuve, but before I do it and mess it up due to incorrect settings, I wanted to ask if this monitor used different tubes or if they were all made with the same model CRT.

Thanks!
according to here it is a g07-cbo https://tubular.atomized.org/tube/19VJTP22
 
Not necessarily, since you have a k4900 frame. Tubes are becoming more rare to find, so I, personally, would not be surprised if it has been tube swapped at a certain point. It's not terribly difficult to disassemble it, however the tube model # sticker may have been removed at some point also.
 
Thanks, @tron guy. That's the answer I was looking for. Reading through my Sencore CR70 guidebook for settings, all the compatible tubes seem to use the same settings. Plugging in the rejuvenator reveals all the guns are good and that there are no shorts, but it fails emission and cutoff testing (cutoff stays well below the desired range and will not move). So this tube is toast. I've never had luck finding a suitable swap for a K4900, now a G07 for this matter. Do swap candidates still exist?
 
Thanks, @tron guy. That's the answer I was looking for. Reading through my Sencore CR70 guidebook for settings, all the compatible tubes seem to use the same settings. Plugging in the rejuvenator reveals all the guns are good and that there are no shorts, but it fails emission and cutoff testing (cutoff stays well below the desired range and will not move). So this tube is toast. I've never had luck finding a suitable swap for a K4900, now a G07 for this matter. Do swap candidates still exist?

If the tube is toast, try turning your heater voltage up 1 volt and rejuvenate. Sometimes that's all it takes. Sometimes that kills it completely, but it's toast anyway.

As far as G07 tube swaps go ... good luck. I've never had one go well. There's always some sort of purity or convergence issue you can't resolve. If you're at the swap point, I'd just look for a K7000 and pretty much any modern-ish TV set. They're usually drop in compatible.
 
Guess I've been lucky then. I swapped the tube on the G07 that was in the Ms Pac that @CarrieZ and I restored a few years ago. I don't recall the tube model, but it came out of this TV she picked up. Didn't even have to swap the yoke, although there was a slight amount of bowing on the horizontal sides. Luckily, that was fairly easy to remedy by just adding strong magnet on T503 (the pin cushion transformer) which straightened it all out. Came out great with no other major adjustments needed. 1748114175166.png

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On that note, the Atari Disco DMC2090DT monitors (which are usually found in I, Robots) are completely compatible with G07s and their tubes are a drop-in replacement. I recently swapped a G07 into @CarrieZ 's I, Robot after getting tired of the flaky Disco chassis that was in there. Been running rock solid ever since.
 
If the tube is toast, try turning your heater voltage up 1 volt and rejuvenate. Sometimes that's all it takes. Sometimes that kills it completely, but it's toast anyway.

Thanks for this! I turned it up to 7V from 6.3V and ran rejuvenate on all three guns. I saw a relatively large spark when I did one of them (not sure which) and thought for sure I blew the filament. Turned it on, then heard a pop from the front of the CRT, yet...I now have working monitor. :)
 
Thanks for this! I turned it up to 7V from 6.3V and ran rejuvenate on all three guns. I saw a relatively large spark when I did one of them (not sure which) and thought for sure I blew the filament. Turned it on, then heard a pop from the front of the CRT, yet...I now have working monitor. :)

Excellent!
 
Thanks for this! I turned it up to 7V from 6.3V and ran rejuvenate on all three guns. I saw a relatively large spark when I did one of them (not sure which) and thought for sure I blew the filament. Turned it on, then heard a pop from the front of the CRT, yet...I now have working monitor. :)
Wonder if you fixed a short?
 
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