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Rejuvenate advice for a Matsushita A68LZU185X

Wildpumpk1n

Wildpumpk1n

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Hi guys,

I would like to rejuvenate a crt from an arcade cab (Matsushita A68LZU185X from a nnc)

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The red is in bad mood. Really. So it's his last chance
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I've got a B&K 467 rejuvnator with the correct connector (number 23).
I've to find the correct HTR and Voltage for my tube.

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I tried on http://tubular.atomized.org/ but I didn't find my tube
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If you have any idea, where I can look, ask, it could be a part of saving this crt
1f601.png

Thanks a lot.
 
Heater voltage will be 6.3V.

I think the B+K documentation says to set G1 to 50V.
 
Like nem said. 6.3V heater voltage. G1 to 50V.
This tube was most likely produced in 2004-2008 so I don’t think it needs rejuvenation. Have you tried recaping it and using an extended remote to adjust red cutoff and gain?
 
There's no harm in connecting the rejuvenator and seeing if the red gun is giving similar readings as the other two.

FWIW, I've had a bunch of these flat tubes that have needed to be rejuvenated. Either because of poor focus or the colors being off balance.
 
Thanks a lot @nem @BuddyC for your advices.
Let's go with this setup.

The Coff red and gain are boost to the top and I've got an extend remote 🤷🏻😶

So I will check the value to start 🙂
 
So finally I tried the rejuvenate...

Unfortunately, we lost our guy in his final battle.
Please, can we take one minute for him 😭😭😭

I tried few time the clean/balance and restore, nothing change, the red canon still go in bad condition
IMG_20220609_145549.jpg

IMG_20220609_145604.jpg

Maybe I can keep it until I find another model to try another restore but I'm not sure.
I don't know what I can do, I think it's dead.😭
 
You are still getting movement on the meter when you adjust the red cutoff right? Also you know your rejuvenate machine is working correct yes? You've used on other tubes? (Gotta double check basics first!)

Considering the strength of the green and blue I would be pretty surprised if you couldn't bring the red back (the cathodes tend to wear down reasonably close to each other unless some type of debris on it or short). At least keep it around to try a different rejuvenator if you need.

In mean Time Flip the CRT face down on towel and bang the bell of the tube a bunch with something hard (I usually use a screw driver handle) while you rejuvenate it. You want to create a lot of vibration to hopefully dislodge any particles. You don't want to hit it so hard that you break the tube obviously.

If nothing else is bringing it back and you have already called it lost cause then before you toss the tube (I would save it until you get a different rejuvenator anyway) turn the heater voltage up quite a bit and try again. The reason I say wait until the end is because overvolt the filament has potential to burn out and if that happens no turning back (although I have tried before on a scrap tube maxed right out and couldn't get it to burn out). Get it nice and warm then try same thing rejuvenate face down hitting.

The way I see it you want to be very careful and delicate with a good working tube that needs a little bit of "cleaning"..... If a tube is no good and getting ready for the scrap then you can't make it worse so don't be shy with it and do whatever you can to try to save it.
 
brad808 said:
You are still getting movement on the meter when you adjust the red cutoff right? Also you know your rejuvenate machine is working correct yes? You've used on other tubes? (Gotta double check basics first!)

Considering the strength of the green and blue I would be pretty surprised if you couldn't bring the red back (the cathodes tend to wear down reasonably close to each other unless some type of debris on it or short). At least keep it around to try a different rejuvenator if you need.

In mean Time Flip the CRT face down on towel and bang the bell of the tube a bunch with something hard (I usually use a screw driver handle) while you rejuvenate it. You want to create a lot of vibration to hopefully dislodge any particles. You don't want to hit it so hard that you break the tube obviously.

If nothing else is bringing it back and you have already called it lost cause then before you toss the tube (I would save it until you get a different rejuvenator anyway) turn the heater voltage up quite a bit and try again. The reason I say wait until the end is because overvolt the filament has potential to burn out and if that happens no turning back (although I have tried before on a scrap tube maxed right out and couldn't get it to burn out). Get it nice and warm then try same thing rejuvenate face down hitting.

The way I see it you want to be very careful and delicate with a good working tube that needs a little bit of "cleaning"..... If a tube is no good and getting ready for the scrap then you can't make it worse so don't be shy with it and do whatever you can to try to save it.
Click to expand...

You right Brad, i've got something when i adjust the red cutoff. I tried two different B&K 467 machine on this tube, same result. The first one was working on another tube :)

So, i will keep it around, and try to find another rejuvenate machine (not easy :( )
And for sure, i will follow your (strange :D :D) advices. I will take picture during the operation

Thanks a lot for the tips, To be Continued guys :thumbup:
 
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