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 Post subject: Tumb of the unknown tube(s)
PostPosted: Jan Thu 05, 2017 9:38 pm 
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Joined: Jan Thu 20, 2011 5:18 am
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Location: Oregon
Hello all, hope you all had a great Christmas and wonderful new year.

Anyway, I have received a box of tube that have no white ink markings any more. I tried the breath test, and the freezer test. No luck.

Is there any way to tell what these tubes could be? by number codes on the base?

for example I have a Westinghouse Reliatron 337 5R09

I would love to find out what these are so I can test them and put them into use.

Thanks and God bless.

Mike


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Fri 06, 2017 12:59 am 
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Location: S. Dartmouth MA 02748-1225 USA
Try a LED flashlight in a darkened room, preferred a LED light with a single LED...

Chas

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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Fri 06, 2017 2:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Cortez, Colorado
Post pictures.


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Fri 06, 2017 6:09 am 
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mjohansson2 wrote:
for example I have a Westinghouse Reliatron 337 5R09

Mike


337 is Westinghouse's EIA number and 5R09 is likely 54-09 or similar... My example would be 1954 week 09, nothing to do with tube type...


Tom


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Sat 07, 2017 1:18 am 
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Joined: Jan Thu 20, 2011 5:18 am
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Location: Oregon
Well I tried the bright LED light in a dark room found out ONE of my tubes is a 35XXGT I still can not tell what the others are.

Any other ideas?

Would pictures help?


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Sat 07, 2017 2:36 am 
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Location: Dallas Texas
Sounds weird but as a last resort often a rub on your nose or forehead will leave a light sheen of oil that combined with a flashlight will help identify. I had a box of around 50 tubes that were generally unreadable but managed to get about a quarter of them identified. Of course you need to know where the marking was originally or have a teenager with really oily skin. If that doesn't work, they make for great off-hand air rifle practice.

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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Sat 07, 2017 8:16 am 
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Joined: Jan Thu 20, 2011 5:18 am
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Location: Oregon
funny you should mention the rifle practice I thought about that, but with the prices on e-bay that would be some expensive targets.

Thanks, mike j


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Sat 07, 2017 2:55 pm 
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mjohansson2 wrote:
Well I tried the bright LED light in a dark room found out ONE of my tubes is a 35XXGT I still can not tell what the others are.

Any other ideas?

Would pictures help?

Yes, if one know's what he's looking at it's easy tot tell if it's a audio output, rectifier etc... A 35xxGT is likely either a 35L6GT or my namesake...


Tom


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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Sat 07, 2017 4:43 pm 
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Location: Cape Cod, MA
I've seen this question many times over the years. The answers that stick in mind are try viewing through the glass from the other side, breathe on the tube, breathe on the tube after freezing it, rub it in your hair (prefer greasy), swab it with iodine.

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 Post subject: Re: Tumb of the unknown tube(s)
PostPosted: Jan Tue 10, 2017 9:42 pm 
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Posts: 1815
Location: Georgetown, Indiana
Has anyone ever tried using a fluorescent blacklight to illuminate a wiped away tube number?

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