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 Post subject: Need Help Identifying this old tube item
PostPosted: Jul Mon 15, 2019 11:14 pm 
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I recently came across this very vintage looking tube item and I have no idea what it is. Any information on what it is would be greatly appreciated.


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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Tue 16, 2019 1:02 am 
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Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I don't know for sure, but I think it might be a radio.
It's got a tuning condenser, a coil, a audio transformer...
I hope someone has seen one before and will know for sure.
I know one thing for sure, I LIKE IT!

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Tue 16, 2019 1:40 am 
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Location: Beaver Falls, PA. USA
Are those 201s on top? The tube in front looks like a 210. It wouldn't be hard to trace the circuit; the components inside appear to be from the early 1930s.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Tue 16, 2019 2:42 am 
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Thanks for your replies.

The tube on the right is a Radiotron X-281, and the tubes on top are 201A's.


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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Tue 16, 2019 2:48 am 
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One of the tubes on top is a 201A. I'm not sure about the other. The label is worn off. I suppose it's possible that it could be different.


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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Tue 16, 2019 8:30 am 
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Joined: Sep Thu 23, 2010 6:37 am
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Location: Powell River BC Canada
Part of a Theremin ?

Does the oscillator control the filament current of the smaller tube,
which is the volume control path to the big tube which is the
audio output.


The thing would then be the V half of the theremin.


Just a guess.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 1:15 am 
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Consider the possibility that there are wrong tubes in it. I don't see a power transformer or filter components so the 81 probably doesn't belong.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 3:45 am 
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I wouldn't care what it is, it is a fantastic display item. WELLL, yes I would be curious and would spend some time tracing out the circuit.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 5:50 am 
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Theremin snip
Attachment:
Theremin.JPG
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de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 6:25 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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The 281 rectifier tube is probably incorrect; the unit was obviously intended to be operated from an external power supply, which would have the rectifier tube included.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 6:29 pm 
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Don't '01As usually run from batteries?

-David


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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 7:09 pm 
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They do, which makes the 281 even more out of place. The 201A tubes might also be incorrect; some circuit tracing is needed to make some sense of the thing.

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 Post subject: Re: Need Help Identifying this old tube item
PostPosted: Jul Wed 17, 2019 9:00 pm 
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Strange but the tubes were obsolete and the parts visible in the box are more like at least mid 30s looking. So apparently not factory work. And it is even possible the tubes are installed because they "fit the sockets" or something.

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