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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Twin flourescent, both flickering
Both tubes in a flourescent are flickering and won't light. Reading up
on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? |
#2
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Twin flourescent, both flickering
R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Is there a starter? - 35p each, I'd try this first |
#3
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Twin flourescent, both flickering
On 20/05/17 16:44, Phil L wrote:
Is there a starter? - 35p each, I'd try this first Thought the same, done that. |
#4
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Twin flourescent, both flickering
If you have any other tubes of the same type change one and see what
happens. I'm assuming these are the standard starter type old school fittings, like the old Thorne ones for example. I thought the capacitor was all to do with power factors and all that? Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "R D S" wrote in message news Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? |
#5
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Twin flourescent, both flickering
Did you get the right ones though.
Are the ends of the tubes going black? You might just be unlucky and have a couple of failed heaters or two that are just past their best. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "R D S" wrote in message news On 20/05/17 16:44, Phil L wrote: Is there a starter? - 35p each, I'd try this first Thought the same, done that. |
#6
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Twin flourescent, both flickering
As an aside I can remember many years ago somebody fitting a double tube
fitting in a cold store room instead of the grotty old filament bulbs that were there. No they never did work, flickered all the time as they were too cold! Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "R D S" wrote in message news On 20/05/17 16:44, Phil L wrote: Is there a starter? - 35p each, I'd try this first Thought the same, done that. |
#7
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Twin flourescent, both flickering
On Sat, 20 May 2017 16:07:33 +0100, R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? I had a twin fluorescent unit that flickered a bit for all of its life. I recently fitted LED retrofit replacement tubes and I am delighted with the result. You do need to know whether the ballast is magnetic or electronic as there are different versions. I seem to recall my posting creating a surprising level of controversy in this group.for some obscure reason. |
#8
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Twin flourescent, both flickering
On Saturday, 20 May 2017 16:07:36 UTC+1, R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Some systems have the tubes in series. |
#9
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Twin flourescent, both flickering
On 20/05/2017 16:07, R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Remove the cap and see. It does sweet FA regarding the lights actually ability to work. A duff one could cause problems. It's only there for power factor corrections. Or swap the lamps for LEDS ones and bypass the ballast and the capacitor. -- Adam |
#10
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Twin flourescent, both flickering
R D S wrote
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Yes, it certainly can be. Like with everything else, they dont all last forever. |
#11
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Twin flourescent, both flickering
"Brian Gaff" wrote in message news If you have any other tubes of the same type change one and see what happens. I'm assuming these are the standard starter type old school fittings, like the old Thorne ones for example. I thought the capacitor was all to do with power factors and all that? Sure, but if its failed, can still be the problem. "R D S" wrote in message news Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? |
#12
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Twin flourescent, both flickering
In article ,
"Brian Gaff" writes: As an aside I can remember many years ago somebody fitting a double tube fitting in a cold store room instead of the grotty old filament bulbs that were there. No they never did work, flickered all the time as they were too cold! They could be made to work in freezers, but there were two problems: they need a higher starting voltage when cold, and they will run at wrong mercury vapour pressure and hence dim if tubes couldn't warm up to 40C glass wall temperature. For old magnetic ballasts, you generally needed SRS (Semi-resonant start) ballasts as they apply twice mains voltage to start the lamp. SRS only worked with 4', 5' and 6' tubes - 4' or 5' best for low temp. Also, tubes were manufactured which were designed to operate at lower temperatures, although they were difficult to find. It was more common to fit insulating sleeves to get tubes up to temperature, although they had a longer run-up time to full light output than using proper low temperature tubes. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#13
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Twin flourescent, both flickering
In article ,
harry writes: On Saturday, 20 May 2017 16:07:36 UTC+1, R D S wrote: Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Some systems have the tubes in series. That's quite common in dual 2' fittings, although not all work that way. The two tubes in series type require different rated starters too. When one tube dies, the other will stop working too. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#14
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Twin flourescent, both flickering
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#15
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Twin flourescent, both flickering
On Saturday, 20 May 2017 16:54:53 UTC+1, R D S wrote:
On 20/05/17 16:44, Phil L wrote: Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Swapping over to LED won't gain a lot. If it's a series fitting, one fault somewhere will cause both to misbehave. 2' is likely to be series, 5' isn't. Series fittings require 110 starters. For any fitting the starter must cover the wattage of the lamp, so no use using a 80-105W starter on a 20W lamp. NT |
#16
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Twin flourescent, both flickering
wrote
R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. Swapping over to LED won't gain a lot. If it's a series fitting, one fault somewhere will cause both to misbehave. 2' is likely to be series, 5' isn't. Series fittings require 110 starters. For any fitting the starter must cover the wattage of the lamp, so no use using a 80-105W starter on a 20W lamp. |
#17
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Twin flourescent, both flickering
On 20/05/2017 22:56, Rod Speed wrote:
wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. The capacitor will be across mains in. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? |
#18
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Twin flourescent, both flickering
On Saturday, 20 May 2017 23:05:18 UTC+1, Fredxxx wrote:
On 20/05/2017 22:56, Rod Speed wrote: tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. The capacitor will be across mains in. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? why bother asking, it's Rod. NT |
#19
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Twin flourescent, both flickering
Fredxxx wrote
Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. |
#20
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Twin flourescent, both flickering
wrote in message ... On Saturday, 20 May 2017 23:05:18 UTC+1, Fredxxx wrote: On 20/05/2017 22:56, Rod Speed wrote: tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. The capacitor will be across mains in. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? why bother asking, it's Rod. You never could bull**** your way out of a wet paper bag. |
#21
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Twin flourescent, both flickering
On Saturday, 20 May 2017 23:14:13 UTC+1, Rod Speed wrote:
Fredxxx wrote Rod Speed wrote tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Give the man a verbal diarrhoea pill. |
#22
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Twin flourescent, both flickering
On 20/05/2017 23:17, Rod Speed wrote:
wrote in message ... On Saturday, 20 May 2017 23:05:18 UTC+1, Fredxxx wrote: On 20/05/2017 22:56, Rod Speed wrote: tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. The capacitor will be across mains in. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? why bother asking, it's Rod. You never could bull**** your way out of a wet paper bag. You normally resort to this form of abuse when proved wrong. |
#23
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Twin flourescent, both flickering
On 20/05/2017 23:14, Rod Speed wrote:
Fredxxx wrote Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Or are you thinking of some other capacitor characteristic that might cause this flicker, if so do tell. |
#24
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Twin flourescent, both flickering
wrote in message ... On Saturday, 20 May 2017 23:14:13 UTC+1, Rod Speed wrote: Fredxxx wrote Rod Speed wrote tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Give the man a verbal diarrhoea pill. You never could bull**** your way out of a wet paper bag. |
#25
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Twin flourescent, both flickering
"Fredxxx" wrote in message news On 20/05/2017 23:17, Rod Speed wrote: wrote in message ... On Saturday, 20 May 2017 23:05:18 UTC+1, Fredxxx wrote: On 20/05/2017 22:56, Rod Speed wrote: tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. The capacitor will be across mains in. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? why bother asking, it's Rod. You never could bull**** your way out of a wet paper bag. You normally resort to this form of abuse when proved wrong. Havent been proven wrong, ****wit. |
#26
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Twin flourescent, both flickering
"Fredxxx" wrote in message news On 20/05/2017 23:14, Rod Speed wrote: Fredxxx wrote Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. |
#27
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Twin flourescent, both flickering
On 21/05/2017 00:07, Rod Speed wrote:
"Fredxxx" wrote in message news On 20/05/2017 23:14, Rod Speed wrote: Fredxxx wrote Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. Electros? Is this a new component technology? Certainly electrolytic capacitors are rarely used across AC mains, so it must be some other capacitor technology. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. Are you now suggesting this partial short will be causing perturbations on mains voltage? Previously you said we haven't established that such a "partial short" would cause "perturbations in the voltage supply". You really ought to make your mind up. |
#28
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Twin flourescent, both flickering
Fredxxx wrote
Rod Speed wrote Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. Electros? Is this a new component technology? Certainly electrolytic capacitors are rarely used across AC mains, so it must be some other capacitor technology. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. Are you now suggesting this partial short will be causing perturbations on mains voltage? Nope, reduced mains voltage across the tubes. And I didnt say WILL BE, I said IF. Previously you said we haven't established that such a "partial short" would cause "perturbations in the voltage supply". Everyone can see themselves that I said nothing of the sort previously. You really ought to make your mind up. You never could bull**** your way out of a wet paper bag. And Adam has said that it could be the cap. You'll have to pardon us who consider that he has seen a hell of a lot more fluoros with that fault than you ever have might just have a tad more of a ****ing clue about whether a cap can do that than you have. |
#29
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Twin flourescent, both flickering
R D S wrote:
Both tubes in a flourescent are flickering and won't light. Reading up on the symptoms suggests the ballast at fault but there's two of them so unlikely they've both failed? As the only thing in there that there's only one of is a capacitor, is it likely to be that at fault? Maybe they are making a cake? |
#30
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Twin flourescent, both flickering
On Sunday, 21 May 2017 05:10:50 UTC+1, Rod Speed wrote:
Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. Electros? Is this a new component technology? Certainly electrolytic capacitors are rarely used across AC mains, so it must be some other capacitor technology. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. Are you now suggesting this partial short will be causing perturbations on mains voltage? Nope, reduced mains voltage across the tubes. And I didnt say WILL BE, I said IF. Previously you said we haven't established that such a "partial short" would cause "perturbations in the voltage supply". Everyone can see themselves that I said nothing of the sort previously. You really ought to make your mind up. You never could bull**** your way out of a wet paper bag. And Adam has said that it could be the cap. You'll have to pardon us who consider that he has seen a hell of a lot more fluoros with that fault than you ever have might just have a tad more of a ****ing clue about whether a cap can do that than you have. He's rarely this funny. Why argue with him. |
#32
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Twin flourescent, both flickering
Those series systems were a load of old rubbish not to be touched by a barge
pole. I had one of those for little tubes in a rostrum camera CCTV magnifier which had a transistor ballast. In the end had to fit two one for each tube due to it just not coming on sometimes. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! wrote in message ... On Saturday, 20 May 2017 16:54:53 UTC+1, R D S wrote: On 20/05/17 16:44, Phil L wrote: Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Swapping over to LED won't gain a lot. If it's a series fitting, one fault somewhere will cause both to misbehave. 2' is likely to be series, 5' isn't. Series fittings require 110 starters. For any fitting the starter must cover the wattage of the lamp, so no use using a 80-105W starter on a 20W lamp. NT |
#33
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Twin flourescent, both flickering
The capacitor would need to be very leaky to cause this though, and it
normally happens gradually. Brian -- ----- - This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please! "Rod Speed" wrote in message ... wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. Swapping over to LED won't gain a lot. If it's a series fitting, one fault somewhere will cause both to misbehave. 2' is likely to be series, 5' isn't. Series fittings require 110 starters. For any fitting the starter must cover the wattage of the lamp, so no use using a 80-105W starter on a 20W lamp. |
#34
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Twin flourescent, both flickering
wrote in message ... On Sunday, 21 May 2017 05:10:50 UTC+1, Rod Speed wrote: Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote tabbypurr wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. Electros? Is this a new component technology? Certainly electrolytic capacitors are rarely used across AC mains, so it must be some other capacitor technology. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. Are you now suggesting this partial short will be causing perturbations on mains voltage? Nope, reduced mains voltage across the tubes. And I didnt say WILL BE, I said IF. Previously you said we haven't established that such a "partial short" would cause "perturbations in the voltage supply". Everyone can see themselves that I said nothing of the sort previously. You really ought to make your mind up. You never could bull**** your way out of a wet paper bag. And Adam has said that it could be the cap. You'll have to pardon us who consider that he has seen a hell of a lot more fluoros with that fault than you ever have might just have a tad more of a ****ing clue about whether a cap can do that than you have. He's rarely this funny. Why argue with him. You never could bull**** your way out of a wet paper bag. |
#35
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Twin flourescent, both flickering
Brian Gaff wrote
The capacitor would need to be very leaky to cause this though, Yes, you don’t see that result very often at all, but one of the reasons for that is that they don’t all have a cap. Its only for power factor correction and that is only common with the industrial versions. and it normally happens gradually. Not as far as when it gets bad enough to be visible is concerned. "Rod Speed" wrote in message ... wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. Swapping over to LED won't gain a lot. If it's a series fitting, one fault somewhere will cause both to misbehave. 2' is likely to be series, 5' isn't. Series fittings require 110 starters. For any fitting the starter must cover the wattage of the lamp, so no use using a 80-105W starter on a 20W lamp. |
#36
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Twin flourescent, both flickering
On Sunday, 21 May 2017 11:24:31 UTC+1, Rod Speed wrote:
Brian Gaff wrote The capacitor would need to be very leaky to cause this though, Yes, you dont see that result very often at all, but one of the reasons for that is that they dont all have a cap. Rodiot can't get anything right today |
#37
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Twin flourescent, both flickering
And Adam has said that it could be the cap. You'll have to pardon us who consider that he has seen a hell of a lot more fluoros with that fault than you ever have might just have a tad more of a ****ing clue about whether a cap can do that than you have. Ooh, Please sir, Adam said it could be the cap! He probably said that just to lure you into a false sense of security. -- Graham. %Profound_observation% |
#38
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Twin flourescent, both flickering
wrote in message ... On Sunday, 21 May 2017 11:24:31 UTC+1, Rod Speed wrote: Brian Gaff wrote The capacitor would need to be very leaky to cause this though, Yes, you dont see that result very often at all, but one of the reasons for that is that they dont all have a cap. Rodiot can't get anything right today You never could bull**** your way out of a wet paper bag. The cap is for power factor correction. Not all fluoros have one. |
#39
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Twin flourescent, both flickering
"Graham." wrote in message ... And Adam has said that it could be the cap. You'll have to pardon us who consider that he has seen a hell of a lot more fluoros with that fault than you ever have might just have a tad more of a ****ing clue about whether a cap can do that than you have. Ooh, Please sir, Adam said it could be the cap! Been having those pathetic little fantasys long ? He probably said that just to lure you into a false sense of security. He said it because he has seen it. And its obvious to anyone with even half a clue that one of those caps can fail in a way that will see a lower than normal voltage across the tubes and that can see them flicker. And completely trivial to see if the cap is the problem by disconnecting it, doesn't even cost any more than a small amount of time to try. |
#40
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Twin flourescent, both flickering
On 21/05/2017 05:05, Rod Speed wrote:
Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote Fredxxx wrote Rod Speed wrote wrote R D S wrote Phil L wrote Is there a starter? - 35p each, I'd try this first Thought the same, done that. So you've got switchstart fittings. Then it's wrong starters, bad tubes or bad contacts. The capacitor can't cause this. Corse it can. And is in fact by far the most likely problem when the tubes arent connected in series after the things he has tried already. The capacitor will be across mains in. Yes. Good, we have got that far. Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker? You havent established that it is causing perturbations in the voltage supply. And it can obviously do that by not being a viable cap anymore anyway. Is that an admission that its not the capacitor? Nope. If the tubes arent in series, that is by far the most likely cause of the problem given what he has tried that has made no difference. Or are you thinking of some other capacitor characteristic that might cause this flicker, Failure mode of electros, yep. Electros? Is this a new component technology? Certainly electrolytic capacitors are rarely used across AC mains, so it must be some other capacitor technology. if so do tell. Most obviously if its got a significant partial short now, as electros sometimes do when they have failed. That could easily see the tubes no longer getting full mains voltage anymore, and so flicker now. Are you now suggesting this partial short will be causing perturbations on mains voltage? Nope, reduced mains voltage across the tubes. And I didnt say WILL BE, I said IF. Previously you said we haven't established that such a "partial short" would cause "perturbations in the voltage supply". Everyone can see themselves that I said nothing of the sort previously. You really ought to make your mind up. You never could bull**** your way out of a wet paper bag. Is that your answer to a question you have failed to answer? You said it could be the cap. I have asked how: "Can you explain, assuming the supply impedance is in the order of a fraction of an ohm, why a capacitor can cause the perturbations in voltage supply to cause a substantial flicker?" You are incapable of providing an answer as to how a faulty capacitor can cause flicker. And Adam has said that it could be the cap. If Adam said "jump of a cliff" would you feel obliged? |
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