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7th Feb 2011, 1:27 pm | #1 |
Rest in Peace
Join Date: Oct 2006
Location: North Wiltshire, UK.
Posts: 638
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Identifying Missing Valve Info
I have not tried this myself, but it looked to be something which could help in identifying those valves where all the info has been rubbed off. I have a fair few of those. Maybe this is something that everybody except me knows about!!
http://www.youtube.com/watch?v=MBE6j...eature=related Worth a try anyway. Ian |
7th Feb 2011, 1:35 pm | #2 |
Retired Dormant Member
Join Date: Feb 2011
Location: Amsterdam, Holland
Posts: 36
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Re: Identifying Missing Valve Info
Hello,
I think that the amount of UV in the torch is revealing the information. The "white" leds are made of blueish (with a lot of UV) leds with some stuff inside to have the white shining. Greetings, Bertus |
7th Feb 2011, 1:47 pm | #3 |
Octode
Join Date: Nov 2003
Location: Bath, Somerset, UK.
Posts: 1,805
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Re: Identifying Missing Valve Info
Very interesting, thanks for the link. As he says, there may be some UV emitted by these LEDs.
Neil
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preserving the recent past, for the distant future. |
7th Feb 2011, 2:04 pm | #4 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Identifying Missing Valve Info
Impressive and will give it a go.
David |
7th Feb 2011, 6:21 pm | #5 |
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Re: Identifying Missing Valve Info
Not quite UV but very blue, does the job and is filed in my 'tips and tricks' section of my brain.
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7th Feb 2011, 6:45 pm | #6 | |
Retired Dormant Member
Join Date: Feb 2011
Location: Amsterdam, Holland
Posts: 36
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Re: Identifying Missing Valve Info
Hello,
White leds are made of GaN: Quote:
http://www.theledlight.com/technical1.html Greetings, Bertus |
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7th Feb 2011, 7:32 pm | #7 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,760
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Re: Identifying Missing Valve Info
That is just brilliant i am off to buy myself a l.e.d torch
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8th Feb 2011, 9:08 am | #8 |
Heptode
Join Date: Sep 2006
Location: Woodbridge, Suffolk, UK.
Posts: 643
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Re: Identifying Missing Valve Info
Well spotted Ian..I'm going to give it a try later.
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8th Feb 2011, 9:40 am | #9 |
Octode
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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Re: Identifying Missing Valve Info
If it is the UV that's revealing the missing text, then a keyring LED UV torch for checking bank notes might do the trick, you can buy these very cheaply. under £2.00 from some places.
John |
8th Feb 2011, 8:45 pm | #10 |
Retired Dormant Member
Join Date: Aug 2009
Location: Barnsley, South Yorkshire, UK.
Posts: 207
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Re: Identifying Missing Valve Info
Brilliant i have a led light, same colour will use to identify some of my unmarked valves.....Alan.
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8th Feb 2011, 10:31 pm | #11 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,987
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Re: Identifying Missing Valve Info
I have tried it, seems to work better on some than others. Some are too far gone to read. John.
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8th Feb 2011, 10:35 pm | #12 |
Retired Dormant Member
Join Date: Feb 2011
Location: Amsterdam, Holland
Posts: 36
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Re: Identifying Missing Valve Info
Hello 60 oldjohn,
The difference can be due to the different type of paint used. Some might react better on the UV than others. Greetings, Bertus |
8th Feb 2011, 11:40 pm | #13 |
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,748
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Re: Identifying Missing Valve Info
I tried this tip using an LED head torch, but unfortunately it revealed nothing on a selection of old and more recent valves with missing markings
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9th Feb 2011, 8:01 am | #14 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
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Re: Identifying Missing Valve Info
I have a huge box of unknowns and it did not work for me either back to the slow detective work for me.
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9th Feb 2011, 11:49 am | #15 |
Rest in Peace
Join Date: Oct 2006
Location: North Wiltshire, UK.
Posts: 638
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Re: Identifying Missing Valve Info
I tried it on modern valves which would have had the details painted on the side and that did nothing. An older type with the info on the top worked to some extent. I can only surmise that it's the amount of UV in the light source. I don't have a torch like the author of the video. Mine only has 7 leds in it My local shop was out of stock of the 72 led model. As John suggested, those things for testing curreny notes might be better. The author of the video clip wanted feedback, I think I might send him some!
Ian. |