Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Hi all. This post is a review of the cheap "green stick" CRT degaussing
wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Occasional used ones come up for sale, and there are still some to be found in the US. However, in the UK they're near-unobtainable. The main source seems to be eBay sellers in China, all of whom are selling the same type: a wand- style degausser in a green plastic shell. So, having a couple of CRTs with purity problems, I bought one to see if it would do any good. The wand cost about 15 GBP and arrived within a couple of weeks. There was no documentation included, leaving me with just the specs given in the eBay listing, which read: -Relative magnetic field: 70MT -Load current: 1A -Working hours: 20 seconds -Power: 220V -Specifications: About 31*31*200(mm) The outer shell is some soft semi-translucent plastic (polythene?), and feels extremely cheap. A momentary switch pokes out of the top of the casing (a momentary switch is good, as it stops me accidentally leaving the coil energised). The wand came with a moulded two-prong plug, which I had to cut off to fit a UK plug. And... I have never seen mains cable that thin before. It is, at least, double insulated, but the conductors are at most 28AWG and possibly even thinner (it's hard to measure stranded cable, but the diameter is somewhere around 0.25mm to 0.35mm). The strain relief clamp in the UK plug wouldn't even hold the cable until I wrapped some extra plastic around it. Oof. Looking at the ampacity ratings on the Wikipedia article for American Wire Gauge, that cable must be very close to, if not exceeding, its recommended current rating. It feels worryingly plausible that someone, somewhere made the calculation "it's fine, if they push the button for too long the coil will burn out before the cable insulation melts". However, the tool does what it's supposed to and noticeably reduced the blotches visible on the CRT display. I used the standard technique of powering the coil from a couple of metres away, bringing it up to the CRT face, circling it around a couple of times, then smoothly backing away two or three metres before switching off again. I definitely recommend sticking to the stated maximum of 20 seconds continuous operation and letting the wand cool fully before using it again. The heat seems to take a few seconds to conduct to the outside of the casing, so it's not until after you've switched it off that you feel how warm it's really getting. I popped the end cap off the casing to take a look inside, but haven't disassembled it further. Strain relief is just a knot in the mains cable. I don't see any current limiting apart from the coil itself. The coil is wrapped around a core of steel plates, and seems to have some more plastic insulation around it. The non-business end of the coil seems to have some copper mesh shielding. Hooking the whole thing up to a component tester, coil resistance measures around 140 ohms, with an inductance of 320mH. In summary, Pros: - Cheap. - Does what it's supposed to. Cons: - Not particularly sturdy. - Probably not the safest thing ever, use with caution. If there were better-quality tools available, I would definitely buy those instead. But there weren't, and this one did at least provide the functionality I needed. HTH, Rayner -- Big-8 Management Board: https://www.big-8.org Homepage: http://magic-cookie.co.uk |
#2
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 2021/01/12 12:48 p.m., Rayner Lucas wrote:
Hi all. This post is a review of the cheap "green stick" CRT degaussing wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Occasional used .... If there were better-quality tools available, I would definitely buy those instead. But there weren't, and this one did at least provide the functionality I needed. HTH, Rayner I use a large Weller Soldering Gun when I can't find one of the degaussing coils in the shop... John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#3
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
|
#5
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 13/01/2021 7:48 am, Rayner Lucas wrote:
Hi all. This post is a review of the cheap "green stick" CRT degaussing wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Occasional used ones come up for sale, and there are still some to be found in the US. However, in the UK they're near-unobtainable. The main source seems to be eBay sellers in China, all of whom are selling the same type: a wand- style degausser in a green plastic shell. So, having a couple of CRTs with purity problems, I bought one to see if it would do any good. The wand cost about 15 GBP and arrived within a couple of weeks. There was no documentation included, leaving me with just the specs given in the eBay listing, which read: -Relative magnetic field: 70MT -Load current: 1A -Working hours: 20 seconds -Power: 220V -Specifications: About 31*31*200(mm) The outer shell is some soft semi-translucent plastic (polythene?), and feels extremely cheap. A momentary switch pokes out of the top of the casing (a momentary switch is good, as it stops me accidentally leaving the coil energised). The wand came with a moulded two-prong plug, which I had to cut off to fit a UK plug. And... I have never seen mains cable that thin before. It is, at least, double insulated, but the conductors are at most 28AWG and possibly even thinner (it's hard to measure stranded cable, but the diameter is somewhere around 0.25mm to 0.35mm). The strain relief clamp in the UK plug wouldn't even hold the cable until I wrapped some extra plastic around it. Oof. Looking at the ampacity ratings on the Wikipedia article for American Wire Gauge, that cable must be very close to, if not exceeding, its recommended current rating. It feels worryingly plausible that someone, somewhere made the calculation "it's fine, if they push the button for too long the coil will burn out before the cable insulation melts". However, the tool does what it's supposed to and noticeably reduced the blotches visible on the CRT display. I used the standard technique of powering the coil from a couple of metres away, bringing it up to the CRT face, circling it around a couple of times, then smoothly backing away two or three metres before switching off again. I definitely recommend sticking to the stated maximum of 20 seconds continuous operation and letting the wand cool fully before using it again. The heat seems to take a few seconds to conduct to the outside of the casing, so it's not until after you've switched it off that you feel how warm it's really getting. I popped the end cap off the casing to take a look inside, but haven't disassembled it further. Strain relief is just a knot in the mains cable. I don't see any current limiting apart from the coil itself. The coil is wrapped around a core of steel plates, and seems to have some more plastic insulation around it. The non-business end of the coil seems to have some copper mesh shielding. Hooking the whole thing up to a component tester, coil resistance measures around 140 ohms, with an inductance of 320mH. In summary, Pros: - Cheap. - Does what it's supposed to. Cons: - Not particularly sturdy. - Probably not the safest thing ever, use with caution. If there were better-quality tools available, I would definitely buy those instead. But there weren't, and this one did at least provide the functionality I needed. HTH, Rayner **I have always been an audio tech. I have always avoided TV work where possible. However, back in the day, I would frequently perform a CRT degauss, using my Han-D-Mag head demagnetiser. I found that it could deal with any degaussing requirement. https://www.ebay.com.au/itm/Tape-hea...-/271234117484 Geez, they're expensive nowadays. I still have mine. -- Trevor Wilson www.rageaudio.com.au -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#6
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Trevor Wilson wrote:
================ **I have always been an audio tech. I have always avoided TV work where possible. However, back in the day, I would frequently perform a CRT degauss, using my Han-D-Mag head demagnetiser. I found that it could deal with any degaussing requirement. https://www.ebay.com.au/itm/Tape-hea...-/271234117484 Geez, they're expensive nowadays. I still have mine. ** I once acquired a demagnetiser that, far as I could tell, was incapable of demagnetising anything. Had no effect on tape heads or the tiniest screwdrivers. It was the Teac E1 as listed in your link. So acting on a hunch, I made a coil of enamel wire ( about 15 turns) just big enough to slip over the head concerned and energised it from a small 6.3V tranny. The coil would get quite hot in about 30 seconds. While energised, I popped it over the head and slowly removed it far away. Totally worked on even the most magnetised heads. Necessity is ....... ...... Phil |
#7
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
[snip]
Back, umm... 1977ish.. (*whew*) I took a slotted steel wallmount bookcase rail (about 1/4 by 1/2 inch by 4 feet), wrapped some, umm, probably #18 lampcord around it, and wired it to a 12VAC transformer. I added in something like a 50 watt 120vac lamp (lighbulb) in series as a current limiter. Yeah, I had no idea what I was doing. Anyway, I then plugged this into a 120VAC power strip, put on some safety gloves and goggles, held it near the tv, and had my friend turn on the power strip. It worked! 1990ish I used a handheld Radio Shack brand tape degausser for the same purpose. And yes, it worked, too. So these things are doable... -- __________________________________________________ ___ Knowledge may be power, but communications is the key [to foil spammers, my address has been double rot-13 encoded] |
#8
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 2021/01/12 4:56 p.m., Rayner Lucas wrote:
In article t, says... In article , says... I use a large Weller Soldering Gun when I can't find one of the degaussing coils in the shop... I also used the Weller or what ever Gun I had handy on the old CRTs. Just about any coil of wire will work that does not draw too much current. Oh, that's a neat idea, I never thought to try a heating coil. I did consider making my own, but with no idea what spec to aim for, buying one seemed like it had a better chance of success :-) Rayner You need something that puts out a large AC field - like the unshielded transformer used in soldering guns. An electric heating coil has a very small magnetic field, I'd say it was most unlikely to be useful for degaussing... John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#9
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 2021/01/12 5:48 p.m., Trevor Wilson wrote:
On 13/01/2021 7:48 am, Rayner Lucas wrote: Hi all. This post is a review of the cheap "green stick" CRT degaussing wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Occasional used .... In summary, Pros: - Cheap. - Does what it's supposed to. Cons: - Not particularly sturdy. - Probably not the safest thing ever, use with caution. If there were better-quality tools available, I would definitely buy those instead. But there weren't, and this one did at least provide the functionality I needed. HTH, Rayner **I have always been an audio tech. I have always avoided TV work where possible. However, back in the day, I would frequently perform a CRT degauss, using my Han-D-Mag head demagnetiser. I found that it could deal with any degaussing requirement. https://www.ebay.com.au/itm/Tape-hea...-/271234117484 Geez, they're expensive nowadays. I still have mine. A bit cheaper on this side of the pond: https://www.atrtape.com/products/han-d-mag John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#10
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
In article ,
says... You need something that puts out a large AC field - like the unshielded transformer used in soldering guns. An electric heating coil has a very small magnetic field, I'd say it was most unlikely to be useful for degaussing... Ah, thanks, I get it now! I don't have a soldering gun, but it would certainly have been a lot easier to find one for sale than a degaussing coil. Or I guess I could've looked around for something else with a transformer I could salvage. Rayner -- Big-8 Management Board: https://www.big-8.org Homepage: http://magic-cookie.co.uk |
#11
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 13/01/2021 1:08 pm, Phil Allison wrote:
Trevor Wilson wrote: ================ **I have always been an audio tech. I have always avoided TV work where possible. However, back in the day, I would frequently perform a CRT degauss, using my Han-D-Mag head demagnetiser. I found that it could deal with any degaussing requirement. https://www.ebay.com.au/itm/Tape-hea...-/271234117484 Geez, they're expensive nowadays. I still have mine. ** I once acquired a demagnetiser that, far as I could tell, was incapable of demagnetising anything. Had no effect on tape heads or the tiniest screwdrivers. It was the Teac E1 as listed in your link. So acting on a hunch, I made a coil of enamel wire ( about 15 turns) just big enough to slip over the head concerned and energised it from a small 6.3V tranny. The coil would get quite hot in about 30 seconds. While energised, I popped it over the head and slowly removed it far away. Totally worked on even the most magnetised heads. Necessity is ....... **My Han-D-Mag demagnetises everything. Heads, TV screens, screwdrivers, etc. As for necessity, I had a Naka in the other day and my part time employee told me that the Han-D-Mag was too big to reach the heads. I dug out this crappy little demag I bought years ago. Didn't work. Stripped it down, re-wound the coil with thicker wire and ran it off 12VAC. Works a treat. BTW: I have this neat and VERY sensitive magnetometer used to test for residual magnetism. -- Trevor Wilson www.rageaudio.com.au -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#12
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 13/01/2021 5:50 pm, John Robertson wrote:
On 2021/01/12 5:48 p.m., Trevor Wilson wrote: On 13/01/2021 7:48 am, Rayner Lucas wrote: Hi all. This post is a review of the cheap "green stick" CRT degaussing wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Occasional used ... In summary, Pros: - Cheap. - Does what it's supposed to. Cons: - Not particularly sturdy. - Probably not the safest thing ever, use with caution. If there were better-quality tools available, I would definitely buy those instead. But there weren't, and this one did at least provide the functionality I needed. HTH, Rayner **I have always been an audio tech. I have always avoided TV work where possible. However, back in the day, I would frequently perform a CRT degauss, using my Han-D-Mag head demagnetiser. I found that it could deal with any degaussing requirement. https://www.ebay.com.au/itm/Tape-hea...-/271234117484 Geez, they're expensive nowadays. I still have mine. A bit cheaper on this side of the pond: https://www.atrtape.com/products/han-d-mag John :-#)# **That's more like it. -- Trevor Wilson www.rageaudio.com.au -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#13
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
John Robertson wrote:
================== I use a large Weller Soldering Gun when I can't find one of the degaussing coils in the shop... I also used the Weller or what ever Gun I had handy on the old CRTs. Just about any coil of wire will work that does not draw too much current. You need something that puts out a large AC field - like the unshielded transformer used in soldering guns. ** Utter nonsense. Such trannies radiate SFA mag fileld. An electric heating coil has a very small magnetic field, ** But that is *not* what a soldering gun loop is. Single turn sure - but a carrying about 250 amps !!. So, at close range the same as a 25 turn coil carrying 10 amps. Much like the example I posted earlier that WORKED like a treat. ....... Phil |
#14
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
https://www.zoro.com/gc-electronics-...17/i/G2187702/
https://www.travers.com/portable-mag... Aqo7EALw_wcB https://www.ebay.com/i/123990657206?...evt=1&mkcid=28 Guys and gals - these things are available OTC here in the US. Why not in the UK? Oh, but they a https://www.bartington.com/degaussing-wand/ https://www.ebay.co.uk/itm/NEW-CRT-M...AOxyKsZRwen D For a one-off use, I would likely stick to the soldering gun - does the trick, even if used "off-label". I bring my 100/300 watt Craftsman gun to Kutztown for the occasional chassis connection, and it is as often as not borrowed by the TV guys for cleaning up the old TV pictures, but seldom for soldering. But if I had to do this every day, or even every week, I would likely invest in a purpose-built device from a reliable maker and reliable source. As I am fond of writing: The Internet is your friend! Peter Wieck Melrose Park, PA |
#15
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
|
#16
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
I thought most crt screens had a coil around then that helped degauss
them every time they are turned on. Unless someone puts a magnet near the screen I doubt that many would need degausing. They do. And, whereas I am not in the vintage CRT hobby, there are any number of applications and any number of reasons why the on-board degausser may not be there, adequate, or even functional. There was (RIP) an individual not far away whose hobby was restoring video arcade games - commercial grade - with the big Curtis-Mathis CRTs in them. And he had half-a-dozen (at least) degaussers of various types and natures that he used regularly. But, apparently, failure of the on-board degausser was common enough that he was prepared. I keep some small, but very powerful magnets with me most of the time - is that painted pipe steel, copper, or possibly something else? Or that light can? What grade stainless *might* that be? And they will stick to most flat-screens - but not cause any distortion. But get one within 10" or so of the big Sony 32" CRT TV (c. 2001) at home and watch the show. Of course, the on-board coil works on that one, still. Peter Wieck Melrose Park, PA |
#17
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 1/13/2021 9:11 AM, Ralph Mowery wrote:
In article , says... For a one-off use, I would likely stick to the soldering gun - does the trick, even if used "off-label". I bring my 100/300 watt Craftsman gun to Kutztown for the occasional chassis connection, and it is as often as not borrowed by the TV guys for cleaning up the old TV pictures, but seldom for soldering. But if I had to do this every day, or even every week, I would likely invest in a purpose-built device from a reliable maker and reliable source. As I am fond of writing: The Internet is your friend! I thought most crt screens had a coil around then that helped degauss them every time they are turned on. Unless someone puts a magnet near the screen I doubt that many would need degausing. With almost everything switching to the flat screens there is probably very little need for a dedicated degausing coil unless your shop specilizes in restoring old electronics. Hard for me to see any shop or one doing much work would not have a soldering gun that could be used. Maybe many do not know the soldering gun could be used. Â*30+ years ago, I put two automotive speakers with big magnets near my TV. It caused a problem on both sides of the screen. Turning it on and off, hoping the internal degausser would fix didn't. Even waiting for the PTC to cool. I used my soldering gun and that fixed it. I found this at $48, https://www.zoro.com/gc-electronics-...gclsrc =3p.ds Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â*Â* Â*Â*Â*Â*Â* Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#18
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Ralph Mowery wrote:
================= I thought most crt screens had a coil around then that helped degauss them every time they are turned on. Unless someone puts a magnet near the screen I doubt that many would need degausing. ** Correct = ALL crt colour TVs and monitors have automatic degaussing at switch on. Most monitors have user operated de-gaussing as well. TV techs may need a de-gausser for that rare event you mentioned . Maybe many do not know the soldering gun could be used. ** Such guns are getting hard to find. Demand is so low, few wholesalers stock them. ...... Phil |
#19
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
|
#20
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Ralph Mowery wrote:
================== You did jog my memory. I remember monitors that had the degauss switch on them. They probably put that on them as many of the computers did have speakers with magnets close to the screen. ** Never seen a PC speaker that did NOT use shielded magnets on the drivers. FYI Consists of a second ferrite ring magnet to cancel external fields - plus a steel cover.. ...... Phil |
#21
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On Tuesday, January 12, 2021 at 10:47:08 PM UTC-8, John Robertson wrote:
On 2021/01/12 4:56 p.m., Rayner Lucas wrote: In article , says... In article , I use a large Weller Soldering Gun when I can't find one of the degaussing coils in the shop... You need something that puts out a large AC field - like the unshielded transformer used in soldering guns. Some soldering guns use a hairpin winding on a toroid core; those do NOT give external field, they're self-shieding, but a 5" diameter simple wire loop connected instead of the short tip will do a degaussing task adequately. |
#22
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
whit3rd wrote:
============== Some soldering guns use a hairpin winding on a toroid core; those do NOT give external field, they're self-shieding, but a 5" diameter simple wire loop connected instead of the short tip will do a degaussing task adequately. ** I have read that a magnet attached to the chuck of a power drill, running at high speed, can also be used to demag a TV tube. Never tried it - seems a bit dodgy. ....... Phil |
#23
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Rayner Lucas wrote:
Hi all. This post is a review of the cheap "green stick" CRT degaussing wands, as I haven't found much discussion of them and some other repairers of vintage monitors may find it useful. CRT degaussing tools seem to be hard to find these days. Small wonder, as hardly anyone uses a CRT these days... Normally when a CRT TV needs some form of repair, it will join its fellows in the recycling bin. |
#24
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On Sunday, January 17, 2021 at 12:34:53 AM UTC-5, wrote:
whit3rd wrote: ============== Some soldering guns use a hairpin winding on a toroid core; those do NOT give external field, they're self-shieding, but a 5" diameter simple wire loop connected instead of the short tip will do a degaussing task adequately. ** I have read that a magnet attached to the chuck of a power drill, running at high speed, can also be used to demag a TV tube. Never tried it - seems a bit dodgy. I can envision some Einstein attaching a magnet to a drill with cellophane tape, and watching in stunned horror as the magnet flies off and smashes the glass top coffee table.. |
#25
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On 2021/01/17 2:02 p.m., wrote:
On Sunday, January 17, 2021 at 12:34:53 AM UTC-5, wrote: whit3rd wrote: ============== Some soldering guns use a hairpin winding on a toroid core; those do NOT give external field, they're self-shieding, but a 5" diameter simple wire loop connected instead of the short tip will do a degaussing task adequately. ** I have read that a magnet attached to the chuck of a power drill, running at high speed, can also be used to demag a TV tube. Never tried it - seems a bit dodgy. You think? Seems an understatement for you, Phil... I can envision some Einstein attaching a magnet to a drill with cellophane tape, and watching in stunned horror as the magnet flies off and smashes the glass top coffee table.. Or explodes the picture tube! John :-#(# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#26
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
|
#27
Posted to sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
Mike Coon wrote:
============= Or explodes the picture tube! There was a girder footbridge over this canal, and small kids had somehow acquired duff CRTs and would carry them half across this bridge in order to watch them smash into the water. ------------------------------- ** One saw a pic of a B&W picture tube that had imploded. The electron gun had been propelled though the screen and imbeded itself in the back of a lounge chair. There is almost 20,000lbs of pressure on the out side of a 23inch one.. ....... Phil |
#28
Posted to rec.games.video.arcade,sci.electronics.repair
|
|||
|
|||
Reviewing a cheap CRT degaussing wand
On Tue, 12 Jan 2021 20:48:30 +0000, Rayner Lucas wrote:
Hi all. This post is a review of the cheap "green stick" CRT degaussing Nice post! Good to know! -- Mike Garcia http://mgarcia.org |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
After nutsack atheists complain, Marines reviewing whether to let Camp Pendleton cross stay. Let Recon handle the atheists once and for all. | Metalworking | |||
how large EMF field when Degaussing large CRT? | Electronics | |||
how large EMF field when Degaussing large CRT? | Electronics Repair |