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Burnt Fingers
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Post subject: A new way to ID tubes with no visible markings  Posted: Apr Thu 12, 2012 4:11 pm |
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Joined: Oct Sat 20, 2007 3:36 am
Posts: 13596
Location: New Hampshire
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pixellany
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Thu 12, 2012 4:28 pm |
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 5390
Location: Annapolis, MD
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Interesting----I had earlier found that some could be identified with an ordinary incandescent flashlight. I wonder if the monochromatic nature of the LED light is relevant? Or maybe it is more polarized? All my unknown tubes are packed, so I can't try this.... 
_________________
"It's always something". --Gilda Radner
"100%" on E-Bay is not IQ......
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mescalero
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Thu 12, 2012 4:37 pm |
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Joined: Feb Thu 24, 2011 1:29 am
Posts: 2802
Location: Dallas, TX - in the city but with bobcats and coyotes
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Many LEDs have a very narrow angle of irradiance. This might simply work to light from within the glass while minimizing glare off of the surface. Or so I postulate. 
_________________
In a triode, no one can hear you screen.
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fvan
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Fri 13, 2012 6:21 pm |
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Joined: Mar Sat 01, 2008 10:02 pm
Posts: 695
Location: Lillooet Canada
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I bought a very small 15X magnifier with 2 LED's, less than $4.00 shipping included from Hong Kong.
It has been just amazing to ID tubes and to take a closer look at parts.
Just look for "15 x LED Light Hand Held" on eBay.
Frank
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Lou deGonzague
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Sat 14, 2012 1:20 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6988
Location: Latham NY
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It just blows my mind to think they can sell something like that at such a price and still make money 
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quadlibet2001
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Sat 14, 2012 6:57 am |
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Joined: Feb Tue 02, 2010 1:46 pm
Posts: 1048
Location: VA, 24019
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This gives me an idea. A while back I bought a set of toy night vision goggles at Goodwill for 2 bucks. They work like a dream, and I can clearly see far away outdoors in pitch black, as well as navigate my way around the cluttered basement with all the lights off. And the batteries last a LONG time.
Anyways, they are infrared. I'll try it soon, and let you all know.
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ariston
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Tue 17, 2012 9:11 am |
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Joined: Mar Sun 20, 2011 2:53 pm
Posts: 383
Location: Spain
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Burnt Fingers
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Tue 17, 2012 4:39 pm |
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Joined: Oct Sat 20, 2007 3:36 am
Posts: 13596
Location: New Hampshire
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That was locked due to forum policy as its a duplicate thread started a day after this one.
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GordonW
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Thu 19, 2012 3:57 pm |
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Joined: Dec Wed 05, 2007 11:08 pm
Posts: 693
Location: Marietta/Moultrie GA
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I'm currently at 66% with this procedure. Had three ST-bottle tubes that were unknown, and found lettering on two of them.
Now, to find what the heck this one mystery Cunningham tube (top cap, think it's a pentode?) is...
Regards,
Gordon.
_________________
"It's the guys who think that attending meetings is real day's work that are the problem."- HepcatWilly (on AudioKarma)
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quadlibet2001
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Mon 23, 2012 6:13 am |
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Joined: Feb Tue 02, 2010 1:46 pm
Posts: 1048
Location: VA, 24019
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The night vision didn't work.
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ariston
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Post subject: Re: A new way to ID tubes with no visible markings Posted: Apr Mon 23, 2012 8:14 am |
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Joined: Mar Sun 20, 2011 2:53 pm
Posts: 383
Location: Spain
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Hi 66% it´s better than nothink
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