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Kidkaos
Grand Master
I'll get that information for you tonight.
Kidkaos
Grand Master
So to clarify,
Can I tube swap this bonded yoke tube using an ms29 yoke? And make it work?
If I can remove the bonded yoke???
Obviously adding purity rings to it etc.
Or not possible to use a bonded yoke??
Kidkaos
Grand Master
Also, does anyone have a set of purity rings and a ms2931 yoke they can spare?? I'd like to try to make this work for my badly burned Blast tubes. But I won't be mad if I can use this for an awesome ms9 chassis either 
Always best to use the rings from the TV set you sac'ed the tube from. The yoke on the other hand is another story.Also, does anyone have a set of purity rings and a ms2931 yoke they can spare?? I'd like to try to make this work for my badly burned Blast tubes. But I won't be mad if I can use this for an awesome ms9 chassis either
If it has a bonded yoke don't bother. It'll be a lot of work to remove it and it's a crapshoot as to whether you'll get a decent picture.
I have had zero luck with tubes using bonded yokes, almost always have purity issues.
Bonded yoke will be a pain to remove and you would need to source convergence rings that fit the tube from the tv. No guarantee of the success of that.
An easier prospect would be to find another chassis compatible with the tv yoke and swap that into the blast instead of the ms2931. I am not recommending that path but it would be easier to get that suitable than trying to remove bonded yoke.
Highly unlikely that bonded yoke is compatible with a nanao, but perhaps a wells Gardner k7400 or u2000 or u5000. Obviously this would require reterminating the jst and amp up connections to the spec needed for the wg chassis. It’s work either way
Kidkaos
Grand Master
I'm hesitant to mess with the bonded yoke now after hearing no success stories and idk how I'd source the correct purity rings for it so I'll leave it be as a retro gaming TV for someone to enjoy. (Pics of snes composite) nice thick scan lines)
I will proceed with the 1st Toshiba tube and will try both an ms9 and ms2931 to see which one works best.
I will proceed with the 1st Toshiba tube and will try both an ms9 and ms2931 to see which one works best.
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Any luck finding that TV model? This Toshiba A68KSA30X tube has really got me curious.
Kidkaos
Grand Master
Here you go.
The fly back looks similar but not a perfect match. Numbers are different as well. I wonder if a flyback from this TV would work on an ms9 or ms29...
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Kidkaos
Grand Master
I tried an ms9 with the regular yoke I got a really faint/short horizontally image. Took off the stock TV yoke threw on an ms9 yoke and rings and got no image at all. Kinda bummed
Should I try the TV purity rings and ms9 yoke next?
Should I try the TV purity rings and ms9 yoke next?
This A68KSA30X12 tube looks like a perfect match physically to the A68KZN699X in the blast. I got spare and yoke and MS-2930 coming my way to try my hand at a swap.
Never gone as far as swapping the yoke on any CRT so thoughts and advice would be appreciated. Might be able to get a second tube.
Never gone as far as swapping the yoke on any CRT so thoughts and advice would be appreciated. Might be able to get a second tube.
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It's a matter of trial and error when yoke swapping. Unscrew the consumer yoke and rings and they should just slide right off. Sometimes they're glued in place with some silicon, so you'll have to cut the glue to loosen it.This A68KSA30X12 tube looks like a perfect match physically to the A68KZN699X in the blast. I got spare and yoke and MS-2930 coming my way to try my hand at a swap.
Never gone as far as swapping the yoke on any CRT so thoughts and advice would be appreciated. Might be able to get a second tube.
Slide the nanao yoke in place and reuse the consumer television convergence rings. Connect the yoke wires to your nanao chassis and turn it on to see if you get an image. If you get any picture that's a good sign. Chances are you'll need to adjust the yoke on the neck to correct any purity issues by sliding it back and forth until you hit the sweet spot. You might also need to adjust the convergence rings to correct purity issues as well, which can be a giant pain in the ass.
You can watch delusional arcades video on how he tube swapped a k-7000 to get a better idea.
Thank you, I will watch the video and see what I can figure. I wouldn't have guessed that I would reuse the rings on the tube already but that does make sense now that I think about it.
Do you typically get better results by using the same brand tubes with similar model numbers?
I was shooting for as close to the same year and brand with the idea that Toshiba would have similar specs for tooling for manufacturing tubes worldwide.
The service manual says this is a bonded yoke and the sixth symbol in the Toshiba type number suggests its bonded but the neck has sets of rings on it. Is this similar to the other bonded yokes you have tried?
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I guess it being bonded was incorrect, it came off with minimal effort.
Edit: added a couple pictures with the tube out and the blast bezel laying on top of it. This tube has a bit more of a curve than the A68KZN699X but it is the right size not horrible.
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Kidkaos
Grand Master
I learned purity rings = no bonded yoke.
Yeah I guess that is so. I was following the info on this wiki and the service manual for this TV which both told me it was a bonded yoke and didn't want to ruin a perfectly good Toshiba set.
https://wiki.arcadeotaku.com/w/CRT_designation_systems#CRT_base_designations
Is your A68KSA30X002 like my A68KSA30X12?
