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Re: What removes sticker residue without hurting the blue paint?
Chuck Harris
Goo gone is not aqueous. It is more like terpene,
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made from the citrus, with mineral oil added to prevent re-adhesion of the stickum. The mineral oil component will separate out, and if you are using a pump type bottle, it will come out all at once... and will not remove the label, only make an oily mess. So, do shake well before use. -Chuck Harris Larry McDavid wrote: I agree with Rick K8EZB that Goo Gone, the citrus-based product, is a good choice for |
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Re: What removes sticker residue without hurting the blue paint?
Chuck Harris
Naptha, or lighter fluid does a good job, and is
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mild on paints and plastics. Hot air will often allow you to peel off a sticker more or less intact, but will usually leave the stickum behind... which you will still have to remove with something like lighter fluid. -Chuck Harris Dennis Tillman W7PF wrote: A far too common problem I have no solution for yet: |
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Re: What removes sticker residue without hurting the blue paint?
Bob Albert
I wonder if denatured alcohol would work.? I have used it successfully on many things.? About the only thing stronger might be acetone but that will eat the paint too.
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Bob On Monday, June 11, 2018, 8:40:39 PM PDT, G Hopper <kb7wsd@...> wrote:
One more vote: Goo gone is my go to.? I learned about it from a woman who refurbished photographic enlargers years ago.? Mild and didn't damage anything, but worked amazingly on adhesives and grease.? Has a pleasant smell too. 73, Grant KB7WSD On Mon, Jun 11, 2018 at 8:35 PM, David M <dgminala@...> wrote: I've used WD40 with good results.? Most paints seem to tolerate it well. | | Virus-free. www.avast.com | |
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Re: Help with a TEK 502 scope
Bob Albert
The 502 is so old that if you can find one to buy you will be in good shape.? Nonworking units would probably be cheap, although one must factor in shipping costs.
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Bob On Monday, June 11, 2018, 8:02:37 PM PDT, Dave Seiter <d.seiter@...> wrote:
Welcome! My first scope was a 502, and I really pushed the bandwidth, using it to look at waveforms on the Commodore PET and CBM computers.? It was actually the reason I joined the group too. Unfortunately, I never did repair mine (I think the problem was the rectifier tubes), because too many other projects came up. -Dave ? ? ? From: "jrodriguezcsb@..." <jrodriguezcsb@...> To: [email protected] Sent: Monday, June 11, 2018 7:12 PM Subject: [TekScopes] Help with a TEK 502 scope ? Hi to all, I am new in this forum, a friend of mine tell me about a group of wise nice people. I am restoring an old tek 502 tube scope. And I need some help: Its HV transformer is death, it has a burned winding and it makes sparks - really nice for a christmas tree but not for a scope, defenetely : ( I have been investigating a little bit and I realise that the CRT transformer of my TEK502 is indeed the same that the tek502A, it has 3 rectifier tubes instead of two. Maybe they change it at the middle of production time. The rest of the scope is in good shape, its CRT is almost new, its power supply caps are like new as well and I change death tubes for NOS ones. So, lets say its like a brand new blind scope. So I would need your help. From my point of view the options are: ? ? ? ? ? 1. Buy a working HV transformer. If any of you have one and want to sell it, I am interested. ? ? ? ? ? 2. Restore it. It is cover by wax, so it would be difficult not to break the little wires. ? ? ? ? ? 3. Manufacturing a new one. I have no idea how many turns it has, wire diameter... I am really interested in learning and, if possible, helping other forum partners. So, where do we start? Waiting for your answers. Thanks a million guys!! PS. I do not know how to post images, if any of you say me how i will upload several pictures of the scope. | | Virus-free. www.avast.com | |
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Re: What removes sticker residue without hurting the blue paint?
One more vote: Goo gone is my go to. I learned about it from a woman who
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refurbished photographic enlargers years ago. Mild and didn't damage anything, but worked amazingly on adhesives and grease. Has a pleasant smell too. 73, Grant KB7WSD On Mon, Jun 11, 2018 at 8:35 PM, David M <dgminala@...> wrote:
I've used WD40 with good results. Most paints seem to tolerate it well. |
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Re: What removes sticker residue without hurting the blue paint?
I've used WD40 with good results. Most paints seem to tolerate it well. As with any old finish, rubbing will likely damage it. I spray a small amount of it on the sticker, let it rest for a few minutes, spray again, and the sticker usually comes right off, leaving what's left of the adhesive mostly dissolved. A paper towel soaked with WD40 takes care of the residue.
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Don't know what's in WD40, or what's different from GoofOff, but, as with almost EVERYTHING else, use at your own risk. Dave M On Mon, Jun 11, 2018 at 07:10 pm, Dennis Tillman W7PF wrote:
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Re: What removes sticker residue without hurting the blue paint?
A method that is about as gentle as any is to use vegetable oil and work it into the adhesive. If a sticker is glossy or plastic coated, carefully remove the gloss by scraping or peel off the plastic part so the oil can soak through the paper into the adhesive. It may need to soak a couple days to soften up enough. Carefully rub off the oil/paper/adhesive goo as much as possible and wash oil residue off with dish washing detergent and water or Windex. This is my method of choice with cosmetic plastic surfaces where alcohol or more agressive solvents would ruin the texture or gloss.
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Re: What removes sticker residue without hurting the blue paint?
I agree with Rick K8EZB that Goo Gone, the citrus-based product, is a good choice for removing many labels. I let the label soak for 30 minutes (Goo Gone is aqueous so it evaporates slowly) and then work to remove the label. If there is substantial paper label remaining, an "orange stick" or even a fingernail can remove the paper, followed by more soaking in Goo Gone. Finally, a soft cotton shop or kitchen towel can remove the remaining adhesive residue. Using a typical kitchen paper towel too vigorously can scuff the paint. I've even used cotton balls in critical areas.
I also use Simple Green Extreme (well diluted) on Tek painted cabinetry. I put a splash of SGE in a tub of warm water and let the case soak for 30 minutes per side, then scrub with a soft brush. I have a kitchen Reverse Osmosis water system so I always do a final rinse in RO water. Now, I've heard some folks complain about Simple Green; I've never tried that product. You would think Simple Green Extreme would be more of a problem than Simple Green, but I've never had any problem with SGE on painted surfaces when diluted. The supplied SGE is quite concentrated so it must be diluted. SGE is a little difficult to find but I got my last gallon jug on Amazon. Incidentally, I often use RO water to wash electronics without issue. Water does not harm most electronics but residual minerals from tap water certainly does! Spill coffee on your computer keyboard? Just rinse thoroughly with RO (or, distilled) water. Anyway, anything I wash with a detergent (e.g. SGE) I final-rinse with RO water. I do have Goof Off, a solvent-based product, but don't dare use it on painted surfaces. But, if you have a label on a stainless steel surface, Goof Off is quick and safe to use. I finish with Goo Gone and RO water rinse. I've found instruments with solid brass ID tags bonded with a really hard adhesive. Those are tough to get off... Isopropyl alcohol is ineffective on most adhesives. Methanol is a much better solvent but will attack some paint finishes and must be used with good ventilation. Finding methanol is getting harder and harder; it seems to have disappeared in California big box stores but is still available in California as a race fuel for motorcycles and cars. I work on many microscopes with aged grease that is tough to get off. Soaking in xylene works well but again that solvent must be used with good ventilation and it is no longer available in California; it is available at Home Depot in every other state. Not for use on any paint! For microscope mechanical subassemblies with dried grease, I use a succession of dirty-to-clean xylene in large-mouth screw jars. I use the jars with Teflon lid liners available from McMaster-Carr. I do use isopropyl alcohol for flux removal but I get the anhydrous alcohol available from some drug stores and from industrial hardware stores. There is no single-best approach and you must apply caution and wisdom to prevent damage. Larry On 6/11/2018 7:10 PM, Dennis Tillman W7PF wrote: A far too common problem I have no solution for yet:... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) |
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Re: OT: AT5005 spectrum analyzer display
I fooled around with this a little more today. The CRT HV stuff seems to be about right, and I bypassed the video (blanking) amplifier, with no change in intensity. Instead of getting buried in details, I decided to take a drastic measure and just jumpered the G1-K on the CRT - this would allow maximum (or excessive) beam current and the brightest trace possible. Still no effect, so it looks like this one is a goner, but will be an ideal candidate for CRT rejuvenation experiments. Next time I'm inclined to fool around with the rejuvenator, I'll give it a shot and see what happens, but for now I'll set it aside. I probably have a socket that will fit, and just need to get the heater voltage spec for this tube, and some time.
Ed |
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Re: What removes sticker residue without hurting the blue paint?
Have you tried Goo Gone? Also, WD-40?
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Barry - N4BUQ On Jun 11, 2018, at 9:10 PM, Dennis Tillman W7PF <dennis@...> wrote: |
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Re: What removes sticker residue without hurting the blue paint?
Once upon a time? NAPA had a spray can of sticker removal that would lift out the solvent in the glue so that all that was left was the rubber solid and it rubbed right off afterward. It was under their own brand name, don't know if it is still available now haven't looked recently. It was not harmful to the old lacquer style paints from the 40's - 50's.
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Might be worth a try if it is still there. Jim Olson (sorry no call sign.) ----- Original Message -----
From: "Rick Boswell" <frboswell@...> To: [email protected] Sent: Monday, June 11, 2018 7:16:48 PM Subject: Re: [TekScopes] What removes sticker residue without hurting the blue paint? Try Goo Gone, a citrus based product (not to be confused with Goof Off, a paint remover). I have used this to remove cal sticker adhesive from several Tek and Agilent instruments. Be gentle! Rick K8EZB |
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Re: Help with a TEK 502 scope
Welcome!
My first scope was a 502, and I really pushed the bandwidth, using it to look at waveforms on the Commodore PET and CBM computers.? It was actually the reason I joined the group too. Unfortunately, I never did repair mine (I think the problem was the rectifier tubes), because too many other projects came up. -Dave From: "jrodriguezcsb@..." <jrodriguezcsb@...> To: [email protected] Sent: Monday, June 11, 2018 7:12 PM Subject: [TekScopes] Help with a TEK 502 scope Hi to all, I am new in this forum, a friend of mine tell me about a group of wise nice people. I am restoring an old tek 502 tube scope. And I need some help: Its HV transformer is death, it has a burned winding and it makes sparks - really nice for a christmas tree but not for a scope, defenetely : ( I have been investigating a little bit and I realise that the CRT transformer of my TEK502 is indeed the same that the tek502A, it has 3 rectifier tubes instead of two. Maybe they change it at the middle of production time. The rest of the scope is in good shape, its CRT is almost new, its power supply caps are like new as well and I change death tubes for NOS ones. So, lets say its like a brand new blind scope. So I would need your help. From my point of view the options are: ? ? ? ? ? 1. Buy a working HV transformer. If any of you have one and want to sell it, I am interested. ? ? ? ? ? 2. Restore it. It is cover by wax, so it would be difficult not to break the little wires. ? ? ? ? ? 3. Manufacturing a new one. I have no idea how many turns it has, wire diameter... I am really interested in learning and, if possible, helping other forum partners. So, where do we start? Waiting for your answers. Thanks a million guys!! PS. I do not know how to post images, if any of you say me how i will upload several pictures of the scope. |
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Tektronix 2465. Odd wave pattern superimposed on waveforms.
Greetings to all.
I have recently purchased a non-working Tektronix 2465 (not A or B). Having carefully recapped the power supply which was blowing fuses due to leaky mains input filter capacitors I am left with an unusual fault. The scope displays a good sine wave on all inputs. But superimposed on the perfect sine wave is a rippling wave that travels from right to left in quick succession. Perhaps 6 waves per second. It does not distort the sine wave in any way but travels along the wave on both the top and bottom edge of the trace. The wave is much lower in intensity than the sine wave displayed but is very noticeable. Perhaps a common issue so please excuse me as I am new to this group. Many thanks and best wishes to all. John |
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Help with a TEK 502 scope HV transformer
Dear all,
I am new in this group, so I would like to greet all of you. I am restoring an old tek 502 scope. I have change death tubes, and check everything and now it powers up. Power supply works, fan works, everything seems to work except the HV power supply. Its CRT looks like new, it has good heater and has not lost its vacuum. However, the HV flyback transformer has a shorted winding and it makes sparks - really nice for a chritsmas tree but, definetely, not for a tek scope. I have been doing a bit of research and I realize it has the same trafo as a tek 502A scope (I do not know why). In fact, it has 3 rectifier tubes. The option I see are: 1. Acquire a new working transformer. If any of you has one and wants to sell it, I am interested. 2. Restoring it. As it is cover in wax, it semms difficult not to brake this little wire. 3. Manufacturing a new one. I do not know how to do it, so I would need your help. Here I would need your help to continue with the restauration. How would you solve this problem? Waiting for your help!! Thanks a million! PS_1. If you tell me how, I would upload here several pictures of it. PS_2. I have write another post with the same info, but I lost it. Forgive me, it is my first day here : ) |
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Help with a TEK 502 scope
Hi to all,
I am new in this forum, a friend of mine tell me about a group of wise nice people. I am restoring an old tek 502 tube scope. And I need some help: Its HV transformer is death, it has a burned winding and it makes sparks - really nice for a christmas tree but not for a scope, defenetely : ( I have been investigating a little bit and I realise that the CRT transformer of my TEK502 is indeed the same that the tek502A, it has 3 rectifier tubes instead of two. Maybe they change it at the middle of production time. The rest of the scope is in good shape, its CRT is almost new, its power supply caps are like new as well and I change death tubes for NOS ones. So, lets say its like a brand new blind scope. So I would need your help. From my point of view the options are: 1. Buy a working HV transformer. If any of you have one and want to sell it, I am interested. 2. Restore it. It is cover by wax, so it would be difficult not to break the little wires. 3. Manufacturing a new one. I have no idea how many turns it has, wire diameter... I am really interested in learning and, if possible, helping other forum partners. So, where do we start? Waiting for your answers. Thanks a million guys!! PS. I do not know how to post images, if any of you say me how i will upload several pictures of the scope. |
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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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Re: let's bring this back to life Re: Tektronix 453 high voltage problem
NOTHING TO READ ABOVE ????
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On 6/11/2018 5:52 PM, John wrote:
Sorry, for -12V read +12V above. --
Dave Manuals@... www.ArtekManuals.com |
John Sykes
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