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 Post subject: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 5:53 pm 
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I got this in a lot of tubes and other radio parts. I can't find any reference to it in any tube site or on Google. The only marking is "VAR A3944". I'm thinking it may not be a vacuum tube at all and maybe is a ballast or the like.


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2019-11-12_10-37-28.JPG [ 259.49 KiB | Viewed 654 times ]

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 7:13 pm 
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Could be a relay or crystal too. But most likely a tube

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 7:26 pm 
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Try and open it up. If the bottom does not come off it's a tube. Could be almost anything.


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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 8:08 pm 
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Could even be a cold cathode rectifier like an 0Z4.

They usually have a glass bulb inside the aluminum envelope.

-Steve

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 8:09 pm 
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Quote:
Try and open it up.

That was my first thought, but then I thought I'd give the forum at try.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 9:31 pm 
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If it's aluminum, no doubt has something inside that can be removed. I've never seen aluminum used on a sealed tube, too much expansion/contraction.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 9:59 pm 
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Well, curiosity got the best of me. I opened it up and this is what I found. I'm not well versed in diode identification. Would that be a 1n34? Anyway, there are four pairs in there. Still not sure what it was used for though.


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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 10:06 pm 
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Possibly a plug-in gate for an early computer? Who knows.. maybe even someone used the can for their own experimental doodad.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 10:08 pm 
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Var
Varactor diodes?


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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Tue 12, 2019 10:55 pm 
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Ring modulator module.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Wed 13, 2019 1:59 am 
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Chas wrote:
Ring modulator module.


Hmmm, nothing like that in my Ring Doorbell.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Thu 14, 2019 2:04 am 
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Trace out the circuitry, and post what you have. That sure looks like a 1N34 diode.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Thu 14, 2019 2:46 am 
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Looks to me like you have, some resistors, some nice crystal diodes for crystal radios and an octal socket for building a tube adapter or something.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Thu 14, 2019 5:54 am 
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Well, I was hoping there would be a flux capacitor in there. Here's the schematic, a little crude ,but it'll do. That's the bottom view of the "tube".

Aren't diodes used to block the reverse EMF when relay contacts open. I don't recall them being in parallel with resistors when used that way, but could it be?


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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Sun 17, 2019 12:06 am 
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viewtopic.php?f=19&t=356238

My version.

Frank


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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Sun 17, 2019 5:46 am 
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Well, so it wasn't a one-off or homebrew thing.

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 Post subject: Re: What is this octal "tube"?
PostPosted: Nov Mon 18, 2019 4:39 am 
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I wonder if it was made for some sort of military compressor or modulator as a plug in device to improve existing equipment
Attachment:
Sylvania VECP 3.jpg
Sylvania VECP 3.jpg [ 689.56 KiB | Viewed 227 times ]
?
There's this schematic posted EDIT (above, guess my in-line messed up) from a '46 compressor/expander I want to build written by a Sylvania Electric engineer in Radio News
that has a similar arrangement.


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