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 Post subject: Vacumm Tube ID reading
PostPosted: Nov Sun 05, 2017 7:29 pm 
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Joined: Jan Mon 30, 2017 1:09 am
Posts: 42
Location: Port Hope, Ontario, Canada, L1A 1W8
I recently received a couple of tips on how to read the ID, on hard to read tubes.
I am wondering now many other good ideas might be out there as well.

I have been told the tube number is directly in line with the key at the base of the tube.
Example, take octal tube, set the key directly in front of you, the tube number I directly above that key.

Got an old glass tube, can't read the number, breath on the tube, fogs up, exposing the faint stamping.
Try a blue light also seems to work as well.

This one I am a bit leery on this one at the moment, love to see some comments.

Still can't read the IS, place the tube in the fridge, let it get cold, Tube will fog up when you
remove it from the fridge, if necessary, breath on it to fog it up even more.

Love to hear what others have up their sleeves trying to ID these oldies.

Steven
VE3PTA


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Nov Mon 06, 2017 2:12 am 
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Location: Hudson, MA
This thread may help
viewtopic.php?f=10&t=305186

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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Nov Thu 09, 2017 4:48 am 
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Sprinkle it with pixie dust. :lol:

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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Dec Tue 05, 2017 2:24 am 
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Location: Sherwood, Oregon
A couple times I had a few tubes that you could not see or read any numbers. I wrapped them in a couple paper towels and put them in the freezer for a few hours. Then get your reading glasses or magnifier and good lighting ready, pull the tube out, unwrap and carefully look. It might take a little while for the numbers to be readable. After the tube is id'd I write the number on the base with a paint pen.


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Dec Tue 05, 2017 3:30 am 
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Location: Tucson, Arizona U.S.A.
Quote:
I have been told the tube number is directly in line with the key at the base of the tube.
Example, take octal tube, set the key directly in front of you, the tube number I directly above that key.

Some brands did this, others didn't. Sometimes the number is on the base; these don't usually disappear. Sometimes it is on the top of the tube; this is especially true of Loctals and Compactrons. The rule is, if you don't see it or the remains of it where you are looking, look somewhere else.

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Jim Mueller


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Dec Thu 07, 2017 9:03 pm 
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Location: Nesbit, Ms.
I've had good luck with shinning a strong flashlight kinda sideways to where the numbers would be.. And moving the tube around until I find what i'm looking for.. Incandescent light seems to work better for me.. Yeah then paint pen it on the base..

Stan

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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Dec Tue 12, 2017 10:35 pm 
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Location: Highland, MI
It's all in the lighting. One condition I use is to turn a lamp on and hold the tube inside the lampshade to flood the tube with light.

Paint pen is okay, but if you have a bakelite base, I prefer to scratch the number on for permanence.


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Jan Sat 06, 2018 11:07 am 
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Location: 253 Blanche St. Plymouth, MI USA
A little oil off your nose , brushed on with your finger in different directions will usually reveal the type. Look at it under your magnifier lamp. Concentrate on the area "above the key" most often its there.
Mark Oppat


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Jan Mon 29, 2018 1:40 am 
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Location: San Angelo, TX
Use a 10 power eye loupe and good sunlight. Super glue fumes will sometimes work. Denis


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Jan Mon 29, 2018 11:45 pm 
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Location: Oswego, NY, USA
Denis wrote: "Super glue fumes will sometimes work." That may also reveal fingerprints of anyone that had touched the tube. Or enough time sniffing the ca fumes up-close trying to read the tube type, I may not care what the tube is....ha.


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Jan Mon 29, 2018 11:58 pm 
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Joined: Jan Mon 30, 2017 1:09 am
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Location: Port Hope, Ontario, Canada, L1A 1W8
Yes, Understand the use super glue to id figure prints.
Just don't get high on the stuff as well.

Some very good idea have come forward on this one for usre.
Many thanks to all for you input.

Steven
VE3PTA


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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Feb Wed 14, 2018 3:33 am 
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Joined: Nov Fri 04, 2011 3:12 am
Posts: 857
Location: New York
LED type "laser" pointer, used at an angle. Not perpendicular to the glass, almost sideways. Have identified about a dozen tubes that the freezer and other methods wouldn't tell me.

So when you aren't teasing the cat with shining the laser all over the floor for it to chase, identify an unknown.
John S.


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