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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: 23
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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Joined: Nov Mon 06, 2017 7:45 pm
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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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Joined: Sep Mon 16, 2013 2:42 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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 Post subject: Re: Vacumm Tube ID reading
PostPosted: Dec Thu 07, 2017 9:03 pm 
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Joined: Sep Thu 01, 2011 3:52 am
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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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