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 Post subject: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 12:43 am 
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I went to a local swap meet a few years ago and came across an interesting looking device. I bought some tubes from the guy and asked about the device. He said he had no clue what it was and that his father built it before he had passed away. I have tried to probe the connections and draw schematics in the past, but to no avail. I have no clue what the thing is and I was wondering if someone on here could help. The tubes on it (From left to right) are a 5Y3, 6SJ7, and a 12AX7. I have also a link to a google drive folder with pictures of the device as well as inside it to see if someone could figure out what it is. I am relatively new to this hobby so please don't be angry if it's something really obvious or simple.


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 1:47 am 
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Without being able to see pictures or other info, that lineup sounds like a simple audio amplifier.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 2:26 am 
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WoodchuckTN wrote:
Without being able to see pictures or other info, that lineup sounds like a simple audio amplifier.

Sorry, I neglected to add images because I'm too new of a user I guess. Is there any way around this? Can I PM you the link?


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 2:34 am 
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Actually I'm unsure if a link can be pm'd. I know you can't pm pictures themselves.

I'll just go out on a limb and pm you my email address and you can send the pictures. Maybe I can even post them for you if you like.

Check your pm's.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 3:53 am 
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sml132 wrote:
WoodchuckTN wrote:
Without being able to see pictures or other info, that lineup sounds like a simple audio amplifier.

Sorry, I neglected to add images because I'm too new of a user I guess. Is there any way around this? Can I PM you the link?


If you just post the link in this thread someone can do it for you with out any trouble.

But the way to post photos is to click on the Img box above then copy and paste the link address between the bracketed img /img and it will appear in your post.

Here is the official thread and instructions about posting pictures,
viewtopic.php?f=2&t=167677


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 3:54 am 
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Here's the link that the OP wanted to post to a bunch of good pictures:

https://drive.google.com/folderview?id=0B0DqApsPCs8CanMxcm1pTXFPd0E

A quick look at the pictures shows it's at least the beginnings of more than an audio amp, given the presence of the tuning capacitor. It looks rather nicely done.

I'll look more closely tomorrow when all four of my synapses are firing. In the meantime others will surely have input.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 3:57 am 
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Ok. I tried to link and post the images but they are too large to display in their native format, 4032 x 3024 and 4 mb. If they were reduced to 800 x 600 they could be displayed.


Last edited by War Bird Radio on Jan Mon 09, 2017 4:20 am, edited 1 time in total.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 4:09 am 
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Looks like some kind of RF preamp.


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 4:27 am 
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Warbirds, your pix disappeared for some reason the 2nd time I looked at them.

Here's the top view. Note no inductors besides the 1 Henry choke.

Attachment:
image.jpeg
image.jpeg [ 124.34 KiB | Viewed 764 times ]

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 4:37 am 
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Here's the bottom view.

Attachment:
image.jpeg
image.jpeg [ 141.5 KiB | Viewed 764 times ]

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 2:07 pm 
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Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Audio oscillator?

Just a quickie guess.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 2:25 pm 
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That's a good guess, John.

If the OP could trace out the connections to the grey 1 henry choke, that would be a good clue.

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 2:37 pm 
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Well it surely has enough electrolytic caps, one double and three singles...


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 3:15 pm 
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I did a Google search for 6sn7 oscillator and some schematics came up for audio oscillator using a dual gang cap and no inductors.


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 3:41 pm 
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Maybe there's a coil missing or hidden from view, which would make something like this a possibility:

http://makearadio.com/visitors/jn-valve-transmitter.php

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 6:07 pm 
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Good detective work, Woodchuck. I think you nailed it.

The original photo does not show a coil, that I can see. With a variable capacitor, it's not an audio device.

Rich


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 6:15 pm 
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Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Rich, W3HWJ wrote:
With a variable capacitor, it's not an audio device.

Rich



Hmmm, I was pretty sure that I've had audio signal generators here on the bench that had variable caps. Isn't the 200 series of HP an audio frequency generator that uses variable caps?

Maybe I'm wrong.

cheers

John

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 6:24 pm 
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You are correct about early audio oscillators using variable caps, but they used a lot of them and they were big (capacitance).

http://historycenter.agilent.com/wp-con ... terior.jpg

Rich


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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Mon 09, 2017 8:17 pm 
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Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
Rich, W3HWJ wrote:
You are correct about early audio oscillators using variable caps, but they used a lot of them and they were big (capacitance).

http://historycenter.agilent.com/wp-con ... terior.jpg

Rich


Good to know.

Thank you.

John

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 Post subject: Re: Unknown homemade antique tube device
PostPosted: Jan Tue 10, 2017 12:52 am 
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Sorry for the delayed response, but as far as I can tell, there isn't any coils or inductors inside the chassis hidden anywhere. I can trace out the connections to the grey inductor if it would help.


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