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 Post subject: Info on this Deforest?
PostPosted: Nov Sat 12, 2016 5:16 pm 
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Location: Virginia, USA
Can anyone give me some information on this Deforest? Thanks.


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Sat 12, 2016 8:52 pm 
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My guess is that it started out as a one tube (exposed), single dial, non regenerative radio receiver (1922 or so vintage) and the panel was later reconfigured to look like a Deforest audion control box. The cabinet is homebrew.

Image
This is what a real DeForest audion control box looks like.

The DeForest coil assembly, which looks like somebody simply stuck on top of the cabinet, doesn't even look like it's hooked up to the control box's circuitry.

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Tue 15, 2016 10:50 pm 
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Thanks. I was a bit suspicious of the cabinet.


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Tue 15, 2016 11:37 pm 
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Your most welcome, but, I think you should have been suspicious about the whole radio and not just the cabinet.

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Fri 18, 2016 12:24 am 
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You're right.

From searching online, the tube looks like a Deforest tubular audion. Think it's real or a reproduction? It came from a radio collector's estate. He had a few rare items.


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Fri 18, 2016 2:55 am 
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Oh, I think it's real, alright, but I'm pretty sure it's not a DeForest tube. I think that's a Cunningham Audiotron tube but I may be wrong. There's a number of ARF tube experts that would know for sure.

Google Image link "Audiotron Tube" https://www.google.com/search?q=defores ... yZ8NykM%3A

I think that radio does has value but more in it's parts then as a whole. The tube, if it has good filaments, is worth around $150+, the Deforest coil assembly is worth around $50 to $100 and the large filament control is highly sought after by collectors for wireless equipment restoration and reproductions. The rest of the radio is just typical 1920s parts that you can find anywhere.

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Fri 18, 2016 6:24 pm 
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Thanks a lot. How can I tell if the filaments are good on the tube?


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Fri 18, 2016 6:33 pm 
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JMF wrote:
Thanks a lot. How can I tell if the filaments are good on the tube?
Use an ohm meter...

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Sun 27, 2016 3:23 am 
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I would have probably built the same thing, if I'd had the same parts laying about. BUT... when I look at the switching set-up on the front, I instantly think of a tapped coil. I don't believe the Deforest coil mount on top is original to the set.

The more I look at it, the more I think it had originally began as a crystal set or an ultra audion set and someone wanted to upgrade it.

I think Indiana is correct.

Lindsey


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Mon 28, 2016 9:30 pm 
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Thanks. You might not have an opinion, but to sell it, would it be better to sell the Deforest coil and unit as two separate items or individually sell parts?


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Mon 28, 2016 11:18 pm 
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Those coils are actually easier to acquire then most people may think. I'd sell the coils and assembly as one package. The coils, alone, don't bring all that much money but they'll definitely enhance the value of the assembly if their included in the assembly's sale.

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Tue 29, 2016 2:08 am 
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And I'll bother you guys again. As for checking the tube with an ohmeter ... do I need to remove the top and bottom wires from the unit to test? How do I apply the leads to check for continuity? Thanks.


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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Tue 29, 2016 1:07 pm 
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As long as the A battery is not hooked up, you should be able to test the filament as it's currently hooked up the the receiver.

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 Post subject: Re: Info on this Deforest?
PostPosted: Nov Tue 29, 2016 11:42 pm 
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Thank. I'll give it a shot.


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 Post subject: Re: Info on this Deforest?
PostPosted: Jan Tue 03, 2017 6:15 pm 
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Joined: Feb Tue 25, 2014 11:06 pm
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Location: Virginia, USA
Here are some closeup pictures of the tube. Look okay? There are three wires coming out of top of tube and two coming out of bottom. I think I'm repeating myself, but how do I hook up multimeter to check for continuity? I'm asking because when I tried to check, it seemed to have continuity depending on which top and bottom wires I connected. Thanks.


Attachments:
AudionTubeUnit.jpg
AudionTubeUnit.jpg [ 228.41 KiB | Viewed 1048 times ]
AudionTubeUnit1.jpg
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 Post subject: Re: Info on this Deforest?
PostPosted: Jan Tue 03, 2017 6:50 pm 
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The filament has a center tap.

Note, it appears the arbor has Dumet wire, FWIK (not much) Dumet was not used in the early Audions but platinum in the arbor. The plate and grid structure also appear too "neat" almost machine made. I have owned a tubular "Electron Relay. Had the platinum but structure was much more crude. Filament was wavy in appearance. I had known it to be real because I got it from the Ham that bought it back then new.. Plate stamped "ER"

Without any further data, visual or otherwise, IMHO, this tube has the possibility of either being a bootleg or a reproduction, either of which is still very interesting.

Phil Winegarten reproductions have increased in value dramatically as collectibles in themselves, only he knew of his technique and any hidden markings of his work... The fact that the filament is totally intact, clean and straight, leads me to believe it is younger than it appears.

I would not attempt to energize it. If it has gone to air, the filament will smoke and disappear.

If you wanted to play the radio a sub from one of the many miniature pocket portable tubes would work fine.

GL on ebay gal220joy

Chas

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Last edited by Chas on Jan Thu 12, 2017 2:39 am, edited 1 time in total.

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 Post subject: Re: Info on this Deforest?
PostPosted: Jan Wed 04, 2017 1:47 am 
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Joined: Feb Tue 25, 2014 11:06 pm
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Location: Virginia, USA
Thanks!


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 Post subject: Re: Info on this Deforest?
PostPosted: Jan Thu 12, 2017 1:23 am 
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Location: Central VA, 23005
http://www.ebay.com/itm/Antique-Radio-R ... 1672918193


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