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Re: What removes sticker residue without hurting the blue paint?
Adhesive residue that has turned hard does require something to soften it,
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but if it is still gooey, I use duct tape to lift it off. It can take persistence and numerous press-and-lift cycles, frequently moving to fresh tape surface, but in the end, it's 100% gone and nothing runs into crevices and no film is left spread around. Compatible with plastic and good paint, and wont wash away lettering. Just did that on a $100 7844. Ed, k1ggi -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dennis Tillman W7PF Sent: Monday, June 11, 2018 10:10 PM To: [email protected] Subject: [TekScopes] What removes sticker residue without hurting the blue paint? A far too common problem I have no solution for yet: What will remove sticker residue on Tek blue paint without harming the paint finish? Stay away from GOOF OFF. Its active ingredient is XYLENE, which dissolves paint very quickly. Don't ask me how I know :( Isopropyl alcohol is very mild on most things but it does poorly against the sticker residue and often you have to rub the affected area to get the glue to come off. The rubbing removes some blue paint and mars the finish so that is no good. Would boiling water soften the sticker residue and leave the paint alone or would it siften the paint as well. Suggestions are welcome. |
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What removes vinyl plasticizer stickyness on cabinets?
This topic is related to the thread on stickers, but is generally over the entire cabinet of the instrument. My humble understanding is that the plasticizers used to make the vinyl supple and stretchy so it can be bonded to the metal sheet prior to stamping and bending slowly separates from the PVC matrix. This makes the surface tacky.
Soap & water cleaning are ineffective. I have usually resorted to some kind of solvent. Something that reacts with the plasticizer but not PVC. Goof-off works but does soften PVC. mineral spirits does not soften the PVC, but also doesn't remove all the tackiness. I'd be interested in other experiences..... Kjo |
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Re: Tektronix 2465. Odd wave pattern superimposed on waveforms.
Chuck Harris
Hi John,
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If this wave only travels on CH1 and CH2, but not on CH3 and CH4, it is probably a problem with the external garbage that Tektronix hung on the CH5+ and CH5- inputs of the U400 channel switch to handle the readout display. I had a 2465 that had this condition, and I was tearing my hair out, until it was suggested to me that the CA3049 transistor arrays U485, and U475, were put there to prevent this problem. The issue is that the channel switch doesn't have the internal hardware to disable the readout from being displayed... it can only select the vertical channel. So, tektronix put the transistor arrays U475 and 480 on the CH5 input to select and deselect when the readout can be displayed. Note that the readout can only be displayed during CH1 and CH2. I can't remember which array was bad, but they are cheap, and you can test all of the transistors fairly easily in circuit. -Chuck Harris John Osborne via Groups.Io wrote: Greetings to all. |
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Re: What removes sticker residue without hurting the blue paint?
walter shawlee
for me, the most reliable "sticker" remover has consistently been goo-gone.
this is especially true with government asset labels and old cal stockers. I also use alcohol sometimes, but it is just not as effective. generally for cleaning, I use windex, scotch-brite pads and sometimes the chemicals above to get the cases clean.? I find the hardest things to remove are not labels, but those idiotic big permanent marker notations scribbled at random on equipment. they are truly hard to eliminate, especially from plastic finishes. I sometimes use a solder-flux safety wash spray chemical to remove them, but it can be a problem for the case finish, so real care is required.? generally alcohol and other chemicals merely remove the topmost layer of the marking, and leave the finish-soaked remains intact. very frustrating. I keep Tek blue paint in stock to re-do covers, but it is only truly successful once the case is thoroughly cleaned and the old finish roughened for good adhesion, and scratches smoothed with scotch-brite. A bit of effort can restore the finish to as-new. I used to have the olive-gray HP paint as well, but it was only useful on older items. -all the best, walter -- Walter Shawlee 2 Sphere Research Corp. Phone: +1 (250-769-1834 -:- We're all in one boat, no matter how it looks to you. (WS2) All you need is love. (John Lennon) But, that doesn't mean other things don't come in handy. (WS2) |
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Re: What removes sticker residue without hurting the blue paint?
stefan_trethan
Not this, but vinyl boots on alligator clips and the like eat
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themselves into polystyrene parts boxes. I'm always suspected the softeners in the PVC. Plastics are weird that way. I'm told the sticking of adhesives isn't fully understood scientifically. Not sure if there is any truth to that, but weird magic like activating plastic surfaces with corona discharge sure means I don't understand it. ST On Tue, Jun 12, 2018 at 4:31 PM, Kevin Oconnor <kjo@...> wrote:
from Chuck: |
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Re: What removes sticker residue without hurting the blue paint?
from Chuck:
"Goo gone is not aqueous. It is more like terpene, made from the citrus, with mineral oil added to prevent re-adhesion of the stickum." Yes, oils seem to passivate the glue surface adhesion bond mechanism. Same as pouring Canola oil on a snake stuck in a glue trap. Slowly the glue is rendered ineffective and the snake squirms away none the worse for the experience! Not sure the atomic mechanism going on though. I have seen some stickers on vinyl covered aluminum that seem to have modified the underlying vinyl by flattening out the orange peal surface. You can remove all trace of the adhesive, but you can do little regarding the latent outline of the sticker. The adhesive, when first applied, must react with the vinyl in some way. Any one else encounter this? Kjo |
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Re: What removes sticker residue without hurting the blue paint?
On Tue, Jun 12, 2018 at 07:14 am, Mlynch001 wrote:
Hit "Enter" too Quick. I found that I can take a small piece of cotton rag, cut to fit over the offending spot, soak with naptha or WD40 and allow to soak for a while. This seems to help dissolve the adhesive and reduces the mess. Good Luck! -- Michael Lynch Dardanelle, AR |
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Re: What removes sticker residue without hurting the blue paint?
it is crazy here, bunch of loonies! worst part I live and work among them, I do my best not upset them by rational outbursts backed by facts.
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R On 2018-06-11 09:44 PM, Kevin Oconnor wrote:
Soon I hear that H20 will no longer be available in California. The legislature has learned that microwave ovens have changed H2O into a carcinogenic substance. There will soon be labeling requirements on all water containing products that they may cause cancer. |
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Re: What removes sticker residue without hurting the blue paint?
Bob Koller
I use automotive "Wax and Grease Remover" obtained from an automotive paint supplier, it is used a prep agent just prior to painting. Works great for removing sticker residue, and other greasy stuff. Won't harm paint or plastic.
I also use it for it's intended purpose just prior to any refinish job. |
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Re: What removes sticker residue without hurting the blue paint?
I¡¯ve had good luck removing labels, label gunk, and other surface contamination with Clutch & Brake cleaner, like this:
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Initially, I was concerned that it would melt plastic or remove paint, but after experiments on stray bits, I¡¯ve not found any evidence of harm and now use it without concern. I¡¯ve used it on cases, plastic meter lenses, buttons, knobs, etc. On 12 Jun 2018, at 14:44, David Berlind <david@...> wrote: |
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Re: What removes sticker residue without hurting the blue paint?
I second the naptha (lighter fluid) suggestion (although I haven't used it
on paint). I had a Simpson multimeter that had a price tag affixed to its plastic lens for what was probably many years. I didn't want to scratch or damage the lens. I was able to lightly fingernail the paper part off.. but the adhesive remained. After asking around (here and on other forums), I settled on trying naptha. I was worried that it might dissolve the plastic. But I decided to give it a go. I couldn't find a store that sold it. So, I went to a smoke shop and there were about a dozen guys inside puffing on giant stogies. The store was a bona fide gas chamber. I held my breath for the duration of the transaction and until I exited the store. I got the lighter fluid but when I got back in the car, my daughters were choking from the stench that I had absorbed during the 60 seconds I was in the store. When I got home, I applied the lighter fluid with a q-tip and the adhesive came of beautifully with no damage to the lens. On Tue, Jun 12, 2018 at 9:33 AM, Phillip Potter <p.potter@...> wrote: For what it¡¯s worth, after scrubbing the covers on my filthy 453 with a |
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Re: Tektronix 2465. Odd wave pattern superimposed on waveforms.
On Mon, 11 Jun 2018 at 22:12 John Osborne via Groups.Io <JohnROsbor=
[email protected]> wrote: The scope displays a good sine wave on all inputs. But superimposed on theHey John, welcome to the group and congrats on the 2465 - sounds like you'll feel right at home here :). At low sweep speeds, the 2400 scopes borrow the beam during the sweep to update the on-screen display (OSD). This causes a little bit of artifacting in the waveform that could manifest as you describe. If this is what you're seeing, you should be able to verify that the artifacting goes away when you turn off the OSD, which you do by turning the display intensity pot to the 12 o'clock position. IIRC there's an adjustment for this somewhere, though I'd have to grouse through the service manual to find it. Siggi |
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Re: What removes sticker residue without hurting the blue paint?
Phillip Potter
For what it¡¯s worth, after scrubbing the covers on my filthy 453 with a Scotch Brite pad and IPA (the only thing that would cut the slime!), they had a matte appearance. After consulting the ¡°Tek Brain Trust,¡± I wiped them down with WD-40 to return a shiny lustrous appearance. It helped (not harmed) the blue Tek paint.
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Now, my 453 ¡°Shines like a dime!¡± Phil, N6OMM On Jun 11, 2018, at 11:06 PM, Adam <adam_alterman@...> wrote: |
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Re: What removes sticker residue without hurting the blue paint?
Chuck Harris
If you soak acrylic plastics in denatured alcohol for more than
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about a minute, it will form great cracks at every stress point. US denatures its ethanol by adding poisons that will make you blind if you drink it, and sick if it gets on your skin... Tax cheats must be punished! The UK, on the other hand, colors their denatured alcohol a pretty violet color, and housewives everywhere use it as a mixer. Check out the comments section for Barrettine Methylated Spirit: <> -Chuck Harris stefan_trethan wrote: I use denatured alcohol (denatured with denatonium benzoate) and found |
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Re: 575 - advice sought from owners
Nah its not so bad. Was only like 25-30$ (american) worth, but it was a
few years ago, so perhaps pricing has changed. But no, the only testing I did on the old paper caps was to throw them in the trash. They made a noise when going in, so I presume they were bad. A few of the electros were definitely dried out tho. I had to take them apart for restuffing. David On Tue, Jun 12, 2018 at 6:18 AM John <John@...> wrote: Thanks David. That's quite a list of capacitors: did you check the paperSent from Mobile Annoyance thingy, please pardon any typos |
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Re: Help with a TEK 502 scope
Hi Albert,
I have been reading in both the forum and the internet and I found quite interesting info like this page: Unfortunately, I do not have 2 HV windings, in fact I have 3. I have 3 diode tubes in the secondary... In this forum however I have not found a clear procedure, I found several links to a previous Yahoo group but I can not access. I will try to upload photos in that way - thanks for the advice : ) I looked in Ebay and only found a 300USD with another 250USD of shippings, as in the programming fiel, it is out of range... and in bad shape Anyway, any idea about: 1. Anyone who sell one for parts or just the parts 2. Rewinding it Thanks for all this support, you are such a nice guys! |
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Re: Help with a TEK 502 scope
Rewinding (and its issues!) HV transformers has very often been discussed in this group. You might search the forum for old messages. A nasty circumstance is that you have 2 HV secondary windings which preferably should be wound bifilar. I recently rewound a 491 HV transformer which had just one HV winding -- far easier. And even then I had to repeat this until I had the proper technique and materials! I would go for a scratch 502A.
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You can upload photos via the website. Go to the Photos section and click New Album et cetera. Or add photos to an existing album when that is allowed by the owner. If you refer to a photo then please add a link in the message since there is no good search facility in the Photos section. Albert
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Mlynch001
John Sykes
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