What's new

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
I got a Toshiba A68KJU96X tube in pretty good shape (in terms of phosphor condition and emissions) but with the face all tagged up. The scratches cut into the glass pretty deep. Furthermore, the anti-static coating was splotchy, having been rubbed off somewhat in the past.

0lc243k.jpg


Nasty tags:

GwlwfGQ.jpg


Despite the scratches, the image is pretty good on this tube.

AYCfnWi.jpg


So, this one is worth saving. A few things have to happen:

1) Removing the anti-static coating
2) Grinding down the glass to the depth of the scratches
3) Evenly polishing the tube face for optical clarity
 

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
First, did a test on one of the smaller tags, using a coarse sanding disc.

1ZdEODr.jpg


qsjUfQ5.jpg


paCyRvA.jpg


Generally, off to a good start. One lesson learned quickly is that it's best to go over the whole monitor to get rid of the anti static coating first. Otherwise, the coating will clog up the sanding discs.
 

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
With the anti-static coating gone, I went over the tube face with the coarse disc, and ground out the scratches until they were not visible any more. This part went hot and fast, without any clogging, as I removed the layer.

g4edvwr.jpg


I started going through the progressively finer sanding discs, across the whole face.
5pRaQ0N.jpg


With the whole face pretty evenly sanded, and looking cloudy, I started to prepare for the buffing step.
MUP50BY.jpg
 

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
I basically did this all over the screen face, starting with just a corner to check how long it takes. Honestly, this part went very quickly. Shit sprays everywhere, and my covering wasn't adequate.

XMV2fnm.jpg


After the first pass, we're nearly finished.

qGQdLrh.jpg
 

Aurich

Legendary
Joined
Jan 28, 2016
Messages
2,138
Reaction score
4,683
Location
SoCal
Nice work! That's a fair amount of grinding to get deep enough to take that stuff out. Only thing remotely close to that I've done is polishing the haze off headlights, but those didn't have anything like that kind of depth.
 

Derick2k

Immortal
Joined
Nov 14, 2015
Messages
9,890
Reaction score
10,784
Location
NYC, USA
Excellent work Mike, sending ya a few tubes :)
But seriously awesome work man. Are you going to try and apply an antistatic coating, etc..?
 

Dreygor

Grand Master
Joined
Dec 18, 2016
Messages
990
Reaction score
715
Location
Midway, GA USA
Wow, that turned out good! I can not count how many monitor tubes I have had that had the face scratched up and I just did not want to deal with them. Looking back I should have bit the bullet and sanded and buffed them out like you did.
 

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
Excellent work Mike, sending ya a few tubes :)
But seriously awesome work man. Are you going to try and apply an antistatic coating, etc..?
Nah, not going to bother - I don't know what I should use, and whether or not I can get the equipment to evenly apply it properly. I've removed it from a tube in the past, and it's caused no problems, and a lot of older '80s monitors simply did not have it to begin with. It's just the mark of a reworked tube!
 

Derick2k

Immortal
Joined
Nov 14, 2015
Messages
9,890
Reaction score
10,784
Location
NYC, USA
Forgot to ask, can you write up what gauge sanding pads, polishing compounds, etc you used to get this done, might helps other attempt a restore like you did.
 

Derick2k

Immortal
Joined
Nov 14, 2015
Messages
9,890
Reaction score
10,784
Location
NYC, USA
Excellent work Mike, sending ya a few tubes :)
But seriously awesome work man. Are you going to try and apply an antistatic coating, etc..?
Nah, not going to bother - I don't know what I should use, and whether or not I can get the equipment to evenly apply it properly. I've removed it from a tube in the past, and it's caused no problems, and a lot of older '80s monitors simply did not have it to begin with. It's just the mark of a reworked tube!
True, would probably be a major PITA to apply. I forget why the manufacturers use these types of coatings on newer tubes, I think some used them as anti-glare coatings, etc..
 

SNK-NEO-GEO

Enlightened
Joined
Jul 21, 2015
Messages
3,527
Reaction score
2,395
Location
Virginia
great work man... could you provide a link of the sanding discs that you used and anything else that you used...I need to see if that works on my scratched up Pelco.
 

Hatsune Mike

Champion
Joined
Dec 8, 2017
Messages
681
Reaction score
1,937
Location
San Francisco Bay Area
I'm actually having trouble finding the one I used, but it's very similar to this one:
https://www.amazon.com/GP28002-Glass-Scratch-Scratches-Diameter/dp/B007CJI6HQ

The only difference is that that one is missing the coarse pads:
https://www.amazon.com/GP13304-GP-PRO150-Sanding-Glass-Abrasive/dp/B00CL91TC6

I'll recommend getting a spare set of pads, because it's easy to eat through a lot when doing the antistatic layer. Ideally, we can find a better way to get all that off first.
https://www.amazon.com/GP41013-Resupply-Glass-Scratch-polishing/dp/B01FKJF8ZM
 

SNK-NEO-GEO

Enlightened
Joined
Jul 21, 2015
Messages
3,527
Reaction score
2,395
Location
Virginia
I'm actually having trouble finding the one I used, but it's very similar to this one:
https://www.amazon.com/GP28002-Glass-Scratch-Scratches-Diameter/dp/B007CJI6HQ

The only difference is that that one is missing the coarse pads:
https://www.amazon.com/GP13304-GP-PRO150-Sanding-Glass-Abrasive/dp/B00CL91TC6

I'll recommend getting a spare set of pads, because it's easy to eat through a lot when doing the antistatic layer. Ideally, we can find a better way to get all that off first.
https://www.amazon.com/GP41013-Resupply-Glass-Scratch-polishing/dp/B01FKJF8ZM
cool..thank you!
 

nem

Legendary
Joined
May 29, 2016
Messages
5,456
Reaction score
5,455
Location
Finland
Awesome, thanks for the write up.

I probably would have gone straight to Novus. Good to know you can, and probably have to, hit it with a coarse sanding pad first.
 

Derick2k

Immortal
Joined
Nov 14, 2015
Messages
9,890
Reaction score
10,784
Location
NYC, USA
I'll recommend getting a spare set of pads, because it's easy to eat through a lot when doing the antistatic layer. Ideally, we can find a better way to get all that off first.
I wonder if there is a better way to remove that coating/layer, I have a couple of tubes that are basically pristine, with the exception of showing damage to the coating.
 

Neodogg

Professional
Joined
Aug 17, 2015
Messages
266
Reaction score
268
Location
Cincinnati, OH
Nice write up, might try this on my cocktail...
 

bagheera369

Champion
Joined
Oct 8, 2016
Messages
1,265
Reaction score
1,199
Location
DFW - TX - USA
Brilliant work...got a ton of tubes in the garage, and some have some pretty heavy scuffs...always been leery about doing this, but this definitely shows it can be done!!!!
 

jermz1

Professional
Joined
Dec 2, 2017
Messages
378
Reaction score
427
Location
South Korea
great work man, glad to know something like this is possible. I feel like an anti static film/vinyl wrap should be a thing now.
 

RealMFnG

Legendary
Joined
Mar 27, 2016
Messages
4,771
Reaction score
4,141
Location
Northern California
I just found a tube swap candidate for an MS9-29. Has minor scratches from storage. Nothing like what Mike had to deal with. I'll be attempting this as well. But will use Roloc discs with my impact tools (Impact tools have a collar that locks bits in place instead of a chuck that tightens down to the bit). Also, from learnings with car headlight repair, I may add a UV coating to the glass though am undecided on that

Will add to this conversation then. Thanks to Mike for laying down the ground work.
 
Top