Can I rejuvenate the CRT in my Mitsubishi Multisync monitor? 

Also Adrian, you need to put the CRT neck up when doing rejuve and short work because the little metal particles need to fall away from the guns, then when done don't put the neck down at any point because there will be metal particles in the tube, just let them fall to the "side" of the tube as they should naturally when you put the tube back to it's operating orientation. We do a lot of this kind of work for Arcade games.

32:33 THAT was a mistake, probably that's why you have bad convergence at two corners. Do not remove correction magnets that are on the inside of the yoke. Those belong to the yoke. If anything, put a dab of two part resin on them so they won't fall off in the future as the original glue dries out. Another suggestion: next time, measure the two yokes with a multimeter. If the readings are close (within 20-30%), don't remove the yoke and convergence assembly from the donor CRT, try it first! A lot of times they are interchangable, so you can save yourself from the hassle of purity and convergence adjustments. Swapping yokes on modern color CRTs is only a last resort, especially on high resolution CRTs. I'd rather swap the horizontal size adjustment coil on the chassis than swap the yoke.

I wasn't shouting, but I was saying that you should have done the fine set of G1 before doing anything. Also, you don't start the tester in Cut-Off. You always start with shorts, if you have a G1 short you can proceed to clear G1 shorts, if you have an HK short or any other short you can't proceed. If the tube is used face up, don't bother with clearing G1 shorts unless you have a place to use it elsewhere that isn't face up. When you saw the good emission, you should have again, stopped. In this case you needed to figure out why you had a good reading and a dim picture. In this case again, the fine set of the G1 should have been checked to make sure it was correct as you made clear you checked out the monitor (you want to check cathode and G1 voltages on the monitor if you have a dim picture and a good emission reading). Lastly, if the tube was designed for a cutoff in the 300 volt range, putting it up to 600 volts could have influenced the result. On some testers the cutoff influences the emission reading. Lastly, since this was a "Hail Mary" attempt on your own equipment, I can't fault you for trying the restoration anyway. If the tube was in better condition it may have worked as the emission didn't immediately drop off like a very small cathode (such as Trinitron) would have.

When I was a TV engineer I built my own monochrome tube zapper. (Rejuvenator) It consisted of two light bulbs a power resistor and a smaller carbon resistor plus mains cable and leads and socket to the tube. It's a long time ago as I was about 17 at the time and now I'm 63. Basically the one bulb 100w was to allow current to the filament and the other 15w was the current feed to the cathode and grid. I copied one that the other guys used and it worked pretty well, but not every tube could be improved. From what I remember it was a way to strip the cathode to allow for a better emission. During the process you would often see flashing inside the tube neck, like bits of molten metal flyng about. Another method used instead of a brand new tube for color TV was a replacement tube gun assembly in the neck. Part of the neck was removed and a new gun assemble attached, done at a specialized factory due to vacuum requirements etc. This was much cheaper than a completely new tube. Now as far as setting up the replacement tube after reassembly, a process of purity adjustment using just a red screen was used to remove any other color from that display. Once that was complete then the other colors were checked individually before convergence was attempted. Sometimes degaussing was required to de-magnitize the shadow mask in the front of the tube. Interestingly I have seen a picture go from looking great with the monitor/tv facing one direction to being all messed up facing a different direction only rotating the unit through 90 degrees on the work bench. This I assumed was due to the earth's magnetic fields affecting the display. Each monitor/TV has de- gaussing coils around the tube and once power cycled from cold a few times this can make a big difference to the performance of the picture purity and convergence. Watching you replace that tube brought back many memories from my past, especially the point when you got a zap off the final anode connector which do have a tendency to re charge after some time. I got a good zap to my belly and almost dropped a 26" color tube while transporting it up some stairs. Needless to say I was always careful to make sure the final anode faced away from me every time I carried one after that. Thanks for the video.

"Bildröhrenregeneriergerät" Only we germans can come up with such a word...

I was a Namco arcade tech back in 99. Senior tech used to have me push that rejuvinator repeatedly for an hour on a bad tube. I thought he was crazy until it actually worked one day. Sometimes it fuses that bad gun together from all the energy being pushed. So don't give up on your old tube too quickly.

One minor safety nit from an old tech, when discharging the anode one hand in the pants pocket, don't give the potential any way to ground through your heart. we had that beaten into us in School. Great vids I have been enjoying them.

If you've ever seen the movie, Dean Koontz "Phantoms", I did all the electronics in the mobile lab set. Some of the monitors had to be taken apart to be installed. The whole set was on a gimble and had to be repaired all the time. I shocked myself several times with those CRTs. They will zap you pretty good.

I have a Beltron crt rejuvinater here that was rebuilt and updated just before CRTs went away. I'm in Portland as well but any crt cooker can destroy the guns if you're not careful. The beltron has a cleaning function and a rejuvenation function and it does all guns at once with 3 meters and lights to show what's going on. It's completely manual so you hold the cleaning or rejuvenation button till your happy oy you kill the guns. Usually I use the cleaning function gently then move up from there if I feel it has a chance. The color gun alignment after the fact if you change the tube will still need to be adjusted again and if you don't have the service manual it's going to be really hard to get it perfect because there generally is steps to do to get it right. I have done quite a few tv tube swaps back in the day and some aligned pretty easily, some you could just get close.

Yay! More CRT fun! These things always seemed so mysterious. I love learning about them.

I had one of these monitors. It cost more than the cpu and motherboard I was using at the time. It was a heavy thing, but it could be used on almost anything. Granted, it was a few years old when I got mine, but it was an amazing piece of kit. Stuff was so strange in the before times. I miss those times, but really don't want to go back. I find it very funny that your camera picked up the screen just fine. It looks amazing in the video. Good to see something special get some love.

I wonder if a light sensor on the camera might have been detecting an IR hotspot from the CRT curing the restoration?

I found a video on youtube showing a guy in the US who repaired CRTs by opening them, changing filaments, and closing. It seems the guy passed away but I can tell you it's possible to do. I could not find the video again. This senior master technician would crack the neck of the crt and then put a scotch tape around the area and leave it there. After one day, the tube would be filled with air and he could safely remove the neck. Having that done, he would replace and clean parts inside the neck, put it back, use a vacuum pump and re-seal it with heat. I really don't remember the details. Nice video, as alwayhs, Adrian!

On ANY computer monitor or TV, if the bright controls are "all the way up" and it is still too dark(won't show darker areas), find and turn up a bit the "G2" control (if you turn too much you get lines in the pix,set below that!) adjusting that really helps on older tubes! On flybacks with 2 controls on it, it is the lower one(upper is foucus) on some sets it is on the tube neck board as a big pot marked G2 almost always.

I'm learning so much about CRTs! Way more than I ever thought I would!

Adrian - love your work! Overscan / Underscan will emulate TVs which are all on Overscan to various degrees. Underscan will show you the bar and other information between frames which can contain Macrovision and teletext information.

Just casually chatting away with a bloody great implosion risk sat there on your lap, not wearing any PPE whatsoever... My palms are dripping with sweat just watching this

i love your rejuvenation videos :)

I'm really glad you included the CRT swap in this video! It was great - I learned loads.

Lovin these CRT videos. Always had a soft spot for CRTs.

I appreciate this very much including all the fails and half-successes. Beautiful work and so interesting to follow the process!

Could we be lucky enouth to witness some new CRT manufacturing plant appearing somewhere? I would love to be able to buy new CRT displays!!

I'm glad I finally got the time to watch this one, I love CRT videos! Yes, even the ones when you break stuff. It doesn't bother me as much because you always make it clear you're aware of the risks, and usually whatever you're working on is pretty much at the end of its rope anyway, so it's not as bad. Of course, now that you've made a video about the monitor, I'm sure someone will send one in to mail call! Or at least a monitor with a similar tube.

I love your CRT videos. Keep them up. I still find CRTs very interesting.

I love the soliloquies delivered by your hands :D Always cracks me up, but your hands are actually quite expressive and it works for your vids!

Hey Adrian, I really enjoy the CRT videos, though for a different reason than the computer repair ones. I am not qualified to play around in those chassis outside of replacing a few caps, and it's interesting to see someone confident enough to dig into them. Thanks for taking one for the team and playing around with these old CRTs!

Love the body style and design, it just looks great completely assembled and working. I know it's a PITA having all the controls in the rear but it makes the face look so striking and confident. What a keeper.

Thats cool! I have an NEC MultiSync II and I absolutely love it!

Good show ADB. Ben is proud of you....

I am terrified of working on crts. I feel I get to live dangerously by watching you deal with them.... love these!

Love the retro towel, Adrian! My grandparents had that exact pattern in the 1970s.

I was TV technician for about 10 years, before becoming a professional programmer. First, looking at the initial problem with your monitor , if it can do HIGH bright high contrast, black and white vertical strips (like letters, menu frame) without FLAMMING (that is luma bleeding to the right) as seen , min 7:49, The CRT IS NOT the culprit!, so, you misdiagnosed at all, the problem you originally has a misadjustment in BLACK LEVEL, if the chassis hasn't analog adjustments pots, you need to enter in service mode and adjust it with the menues. (I imagine that you already tried the SCREEN pot at the flyback to correct it and you was unabled to correct it with that control, also assuming as it is in focus, the flyback HV circuit is not the culprit, anything wrong there will make the focus to move constantly and ugly). After you change the CRT, you has problems with yoke/crt mismatching one each other, you need to implement MAGNET strips to marry the joke with the CRT. That is, magnetic strip that you can set in the glass of the neck, or stick it over the windings of the yoke, those magnet will affect a single corner, or top center, bottom center, etc., deppends on where you set, the angle also affect. But for doing that, you need to find out the exact position of the joke (that is how far or near is the joke mounted against the glass, sometime it needs a bit of space, so there is rubber mounts aswell that prevent the joke to move freely while making space). The PURITY rings (both rings near to the screen) adjust it first, rotating both at the same time will CENTER the IMAGE (you need a TV pattern for calibrating the center), and then the CONVERGENCE rings (rings near to the socket) adjust it later. If you can't do purity AND CENTERERING, you can't do convergence. If purity is not OK, that means the joke is in a bad position, change the position of the joke, once you has perfect purity and center, you can adjust the convergence, the convergence must be adjusted WATCHING ONLY the CENTER of the screen, your goal is a perfect match IN THE CENTER, once achieved that, it is DONE!. For the corners, you needs to insert magnet strips. (when the center of the screen match convergence but not corners that means that the joke or the CRT has quality issues, for matching marrying the quality of both are used magned strips). Remember that a yoke can be in the FAR / NEAR regard screen (focal point) correct position, but if the joke is falling that is, the winding is pointing some degree down, or to the left, or to the right, or up, that joke is not CENTERED, and will affect purity, image center, and convergence. Make sure to measure that mounting rubbers maintain the joke centered vertically and horizontally, a big mistake is to mount a rubber deeper that the rubber of the other side, so the jokes points to some side. Other mistake, is not to place the rings holder in the exact position where the manufacturer placed it, that happens when a newbie clean the glass, so the exact dirt mark in the glass where the ring holder was, is not visible anymore!. If it out of position, the rings won't do the exact function that it must do, like purity ring affecting convergence, or convergence rings affecting purity, that means that it is out of place, if is too out of place, you can to rotate a ring and it will do nothig, or affect just a bit, but not enough, that is out of place.

"It's a standard US plug now..." One prong is already bent, yup it's a US plug.

Great video, I love crts, great to see one resurrected and used

I love CRT videos too! Don't stop making them

Used a 20" Diamond Scan Multisync on a CAD station back in the day... Brilliant monitor.

CRTs are awesome, don't worry about showing and working on them!

Nice tester/rejuvenator. And a good job on the CRT swap.

These had the best picture ive ever seen on any crt, excellent screens these were i had one with my pentium90 mitsubishi desktop pc in 1998

Wow, this takes me back. I had one of these, probably the 1371 model, and used it FOREVER. Can't tell you how many orcs and gnolls I killed in Everquest staring at one of these. And don't believe the PCMag review! NEC bought lots of ad space so PCMag reviewers would always trash talk any competitors. The Diamond Scan was great and versatile.

"It was probably used until it was... not used" fair enough

Love the DeskMate!! Just installed that on my 5160 last week.

I picked up a similar one recently sweet, thanks for the video

Funny, to my eyes that looks like professional audio or video equipment from the '80s, especially the big colored buttons and the knobs with colored caps. I love this video, by the way. I don't why, but I was excited to see your "new" CRT tester/rejuvenator.

This is amazing. I did buy a mint Nixdorf multisync and never got around to working out the pin outs. Just opened it up to work out who made it and it is the same monitor as you have there!

The picture looks good and clear to me on menu screen

I remember getting my first ever nec multi sync monitor, loved the fact you could connect almost anything.

Hey Adrian, it is awesome to see the process and this obscure tools. There are some comments indicating some enhancements to what you are doing, maybe in the future you could add some of this knowledge to the videos or do some collab with another RU-vidr that may have developed his professional life during the CRT years. Keep up the great content!

This is not nessisaraly computer related but watching your videos has given me skills to work with a mel meter and asses wireing and read electrical diagrams and schematics. becase of your videos I was able to build a new wireing harness for my friends car and do it correctly. So thank you so much.

I love your crt videos please keep doing them it's always really interesting to see u work on crts and I love ur videos in general and my dad loves ur videos too we always watch them together. Thank you for content and stay strong :) and PS greetings from my dad out of Germany Sry for my bad English im 14 and haven't leard it that much yet, hope u see this comment

Keep the CRT goodness coming!

I love your CRT videos!

keep up the great work Adrian 🕹 ♥

Very informative Adrian... Thanks for your efforts...

We love them, too.

Love watching these videos

The stuff you learned during the process isn't something you can learn from a book. You have to try it and learn from the experience. Very Good end result considering the replacement tube was completely different from the original! It's a miracle you were able to get it to converge at all. I also didn't think it was possible to swap color CRTs without retaining the original yoke that came with the CRT. I just figured they are glued on for a reason so I never tried this because I was also afraid of imploding the tube by prying the yoke off. You are much braver than I am! Kids don't try this at home!

I worked in a repair shop in the 90s. We did still replace CRTs. You would be surprised how attached people can be to their idiot boxes. We didn't do rejuvenators or brighteners we thought the were bullshit. The fixes are only temporary.

Good work Adrian, enjoyed the video...

Glad to see your experiences with Rejuvenation. I've got a nice BK467. I've built some custom adapters to use on Sony PVMs and BVM tubes. Sometimes tubes are just too far gone to save, but sometimes you can boost them and get some extra useable life from it. Thanks Adrian. Keep working on CRTs.

in my opinion, the "fixes" videos are the best! i love crts too.

Hey! You have my monitor! (I have exactly this monitor. But not worn out. ^_^ )

Thanks for another informative and entertaining video, Adrian. More, please. When I serviced for Zenith, we used "convergence helpers" on CRTs which resisted satisfactory colour purity and beam convergence - 3 to 4" x 1/2" plastic strips with a thin sort of "fridge magnet" 1/2" square at one end. After a few passes of the "de rigueur" degaussing coil, we techs slid these gimmicks, magnetic end first, under the yoke and wiggled 'em into some semblance of correctness - while observing a generator's pattern in a mirror, of course. A little dab of RTV silicone and the "magique" was complete. Best wishes from Vancouver BC.

well done!!!! i love Crt also ...

Good job, a lot of work with magnet rings. I spend some hours to setup properly my 5154. I have not heard about magnets stuck to the picture tube, thanks for the interesting information.

Adrian..great show

The inaccurate 16 color palette reminded me of a TSR called Rainbow I used years ago to set the values of 16 color mode on my VGA monitor. Each color went from 0 to 64 (or 128, I'm not sure which). Customizing the colors came in handy since it allowed a colorblind person like me to make sense of what was on the screen. Most programs I used were well behaved with it running in the background but only a few were games so I don't know if a lot of games could make use of it.

I love your crt vids. While the amount of content about them is increasing, I struggle to find videos which help me repair or rgb mod my stock, pvm, or arcade crts. I’m still scared of tube swaps even though I need to do some. And I’m terrified of swapping neck or driver boards despite having replacements.

CRT for life!

Hey Adrian, there is a company called Lexel Imaging that has a significant stock of unused CRTs that might be able to help you if you send them an e-mail. You may have heard previously about a company called VDC that a lot of TRS-80 folks used to get replacement tubes from, well Lexel is a subsidiary of VDC to whom most of the CRT stock was transferred a year or two ago. I ordered a tube from VDC for a CGA monitor back in 2018, they know how to cross-reference these and find one that's compatible. EDIT: I actually thought the video was over when I commented this but there's like 15 minutes left, so just disregard if this advice isn't applicable. But maybe if you need a new CRT in the future you can contact them!

CRT vids are my fave! please keep doing 'em. Maybe the rejuvenation process should only be done once? Is there manuals that say how many times you can do it, or how long to wait between processes? the first pass was an improvment at least

B&K Precision still make awesome tools. I absolutely LOVE my multimeter from them.

so pleased I bought one of the last iiyama CRTs before tubes finally succumbed to panels, and boy my OG DOS games look so much better with CRT then panel on my PIII retro gaming rig. The romance is real

Don't worry I love these CRT videos and I love CRTs.

I had the pleasure of using an NEC 15" Multisync back in the day with my A3000T. I think the price was about $720 USD back in the day. And, it was "Flat screen". Hehehe. Cool videos!

Really good video

I'm actually kinda glad the rejuvenation didn't work... in that HAD it worked it certainly would have given me false sense of security and I might have easily ended up destroying CRT monitors sometime in the future. Also... even if the process itself was unsuccessful I still learned a lot - Thanks!

I really enjoy the CRT videos. I wish I had the space ... had to give mine up years back 😢

I once found a beautiful CRT rejuvenator in the trash! It looks almost like new and powers up just fine! I have been waiting to try it on one of my old CRT's, but they don't need rejuvenating just yet. I like it because it is a neat little portable kit built right into its own case! The one you have here looks WAY more advanced than mine and MUCH cooler! 👍👍 PS: Many years ago I was working on a TV that burned out and I attempted to lift off the high voltage suction cup and pry it off the CRT tube. Though the TV was unplugged, I had forgot to discharge the high voltage capacitor and I had my other hand touching the glass front of the tube. I saw a very tiny spark at the suction cup area but received such a high jolt straight across my chest that I was literally thrown back against my mom's breakfront cabinet! Today that I am much older, such a jolt straight through my chest would probably kill me instantly! Needless to say I have NEVER forgotten to discharge the high voltage capacitor in ANY electronics I have worked in since then and I do my best to work with one hand behind my back when I discharge them! Lesson learned!! 😵

Don't worry Adrian I love crt videos almost as much as I love your c64 videos

Dude I love CRT's as well

You got ghosts in your camera Adrian, but always enjoy the videos :D

So, I was given a 19" SUN flat-crt the other day. I plan on using it for something, even have the vga adapter!

"I just LOVE CRTs" You and me both! There's nothing IMHO that can beat the warm fuzzy glow of the phosphors in a CRT, and because using a linear particle accelerator (because yes, a CRT is a form of linear particle accelerator, or "linac") to display an image is pretty damn cool.

More CRT regeneration! I love CRT's as well and am always up for CRT tech! You Go Adrian!

Adrian, I have two of these Kongo units myself. Both needed serviced, and I have the maintenance manual if you need it. I have a feeling your unit needs to be calibrated at the very least. Also, the initial readings that you saw (.9) were good. That said, it’s possible the cutoff wasn’t sufficient to achieve good grayscale levels. When this is the issue, it’s a lot harder to achieve a decent restore. I have a number of these rejuv units - Konig 850, B&K 467, Sencore CR7000, among others. I’m happy to help you out with these restores in the future. The trick is to use each of the testers to get a good idea of what the true tube health is. Each of the testers can be used to confirm each other’s readings. Thanks for the video. Please reach out if you have questions.

Hey, if you like it, I love it!

It would have been interesting to more thoroughly test things out after just the first rejuvenation, but live and learn, I suppose. Hindsight is 20/20 as always.

I was sad that it was Saturday, as I had basically wasted my week off, Then I saw ADB's regular Saturday video "Things are looking up".

It may be my imagination, but it seemed like the camera getting brighter an dimmer was fluctuating at the same rate as the blue meter. The peaking was out of phase with the meter.

Don't be too afraid to stick some cheater magnets on the tube! I used some on my Trinitron TV and it helped straighten out the edges. I just got some soft square fridge type magnets off Amazon and slid them around until they started affecting the area I wanted to fix, then rotate and slide them until you get the effect you are looking for

I had one of those! Got it for $20 at a government auction. Used it on my C-128 (composite and RGBI) and SNES (analog RGB). It also had a weak CRT but it looked pretty good after 20 minutes or so. Turning up the G2 helped some, once I got it just below the point you saw retrace lines, I had good range on the brightness control after warmup.

As an old CRT tech I can tell you I have done this hundreds of times. In the end I explained to my customers that there was no warranty, It could work for 1 day I week or 1 month. Chances being it would fix for 3 months. In the end I stopped doing this , my customers were never satisfied in the end of the day.

I'm one of a small handful of Apple certified convergence techs! OMG so glad you mentioned how critical and bizarre it is to do. Thanks for spreading the truth. All the love, keep it up. And yes I'm the funny colored hair guy in some of the old Ads showing the old crt iMacs getting built.

I like to watch this, no problem at all. They have a term "Diamondtron" which compete with Sony Trinitron and it quality really great.

Ah yes, back in the day when I got my first NEC which connected to ANYTHING where you could put the plug in (OK, except my girlfriend ) and it showed actually a picture. This NEC was amazing, but died some time later during a thunderstorm and was eventually replaced by a TFT.

Hey now I LIKE all the CRT videos. I wouldn’t watch a car channel to see if they work on a bike, do your thing!

Nice work.

I'm not groaning at all, I LOVE the CRT videos. I find them so interesting for some reason!

Certainly not groaning from all of the CRT coverage. They're cool, and I don't want any part in opening one up myself, so it's good to live vicariously.