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 Post subject: What is this?
PostPosted: Jan Tue 23, 2007 5:34 am 
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Hello. I made a post about this in the auctions section, but now that I have purchased it off of ebay and have more information about it, i figured I would make another post with more detail.

It is partially dissasembled in the first picture, so I removed the dial lamp, which is what fills that hole on the front towards the top. It has a power transformer and it has two variable caps. It also has a switch on the back. There are remnants of a label on the back that says BUD Radio INC. Catalogue NO. and then the rest is missing. There is a company called BUD today that makes project enclosures. There is a strange porcelain binding post on top. The clear thing on the top is two jacks.

I would say that it is a one tube homebrew reciever, but it has a 11L7GT tube in it. It has a coil that is wrapped around a dowel inside. Does anyone know about this?

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 Post subject:
PostPosted: Jan Tue 23, 2007 5:49 am 
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Bud is probably the company that made the box. They still make that style today.

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 Post subject: Re: What is this?
PostPosted: Jan Tue 23, 2007 5:55 am 
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Zenithman wrote:
I would say that it is a one tube homebrew reciever, but it has a 11L7GT tube in it. It has a coil that is wrapped around a dowel inside. Does anyone know about this?[/img]


Are you sure about that tube number? I've looked everywhere and can't find that tube. Also, you said that oscillator you have also has an 11L7GT. Does anyone know what an 11L7GT was used for?

http://www.antiqueradios.com/forums/vie ... ht=#515932


Last edited by Catfish on Jan Tue 23, 2007 5:58 am, edited 1 time in total.

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 Post subject:
PostPosted: Jan Tue 23, 2007 5:57 am 
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That's what I figured. The box is professional, but the electronics of this unit aren't. Also, the capacitors and resistors are thirties style, along with the wire, but the tube isn't.

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PostPosted: Jan Tue 23, 2007 5:58 am 
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Did you mean a 117L7GT? If so, I wonder if it isn't a wireless phono transmitter. IIRC, I saw a circuit using that tube in an old magazine around here somewhere.

John

Edit: Catfish, the 117L7GT is a beam power pentode/half wave rectifier.

http://www.mif.pg.gda.pl/homepages/frank/sheets/049/1/117L7GT.pdf

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Last edited by OldWireBender on Jan Tue 23, 2007 6:01 am, edited 1 time in total.

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 Post subject:
PostPosted: Jan Tue 23, 2007 5:59 am 
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Dangit! I am a slow typer and bad with numbers! Sorry, 117L7GT, like Phils 'L7 transmitter. Same with the oscillator. Thanks.

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 Post subject:
PostPosted: Jan Tue 23, 2007 5:59 am 
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I think that it is a one tube crystal controlled CW transmitter. there is probably a jack to plug a key in.

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 Post subject:
PostPosted: Jan Tue 23, 2007 6:04 am 
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Two people passed me up typing! I need a tutor! Someone else is probably passing me up now. I was thinking that it was some kind of transmitter when I bought it, but I wasn't sure. I figured that I could use its parts to make an am transmitter if I had to. I would like to have an am transmitter. It would be nice if could have music on my am radios that I can understand!

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 Post subject:
PostPosted: Jan Tue 23, 2007 6:13 am 
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[quote="OldWireBender"]Edit: Catfish, the 117L7GT is a beam power pentode/half wave rectifier.

Yes, I know what a 117L7 is, and I thought that probably was what it was, I just couldn't find an 11L7.


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 Post subject:
PostPosted: Jan Tue 23, 2007 6:19 am 
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That thing looks sort of like an old electric fence supply.

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 Post subject:
PostPosted: Jan Tue 23, 2007 6:39 am 
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Must be a transmitter, should be a couple of coils inside and a place for a crystal.

Dave


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 Post subject: Re: What is this?
PostPosted: Jan Tue 23, 2007 7:04 am 
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Catfish wrote:
Are you sure about that tube number? I've looked everywhere and can't find that tube. Also, you said that oscillator you have also has an 11L7GT. Does anyone know what an 11L7GT was used for?

Perfectly good tube number. Rectifier and beam power amplifier, listed as 117L7/M7-GT. This is the tube used in the code practice oscillator that I mentioned above. Filament 0.09 amps @ 117 volts.

RCA Receiving Tube Manuals (the only ones I have handy at the moment):
RC-13 (1937) not listed,
RC-14 (1942) page 252,
RC-15 page 185,
RC-16 page 236,
RC-19 page 315,
RC-22 page 467.

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Last edited by Leigh on Jan Tue 23, 2007 7:13 am, edited 1 time in total.

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 Post subject:
PostPosted: Jan Tue 23, 2007 7:12 am 
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It does have a coil and the switch on the back of it is connected to the coil. If anyone has plans for this or any information on the circuit, I would be interested in them considering that a couple of parts have become unsoldered due to poor workmanship. Do you think that the clear jack (for a two prong object) could have been for a crystal?

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 Post subject: Re: What is this?
PostPosted: Jan Tue 23, 2007 7:14 am 
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Leigh wrote:
Catfish wrote:
Are you sure about that tube number? I've looked everywhere and can't find that tube. Also, you said that oscillator you have also has an 11L7GT. Does anyone know what an 11L7GT was used for?


Perfectly good tube number. Rectifier and beam power amplifier, listed as 117L7/M7-GT. This is the tube used in the code practice oscillator that I mentioned above. Filament 0.09 amps @ 117 volts.



Leigh, you missed the whole point. Read my quote again.


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 Post subject:
PostPosted: Jan Tue 23, 2007 8:10 am 
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I think you will find the plans for this in CQ magazine sometime in 1957, this was a very common low power transmitter.

Dave


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 Post subject: Re: What is this?
PostPosted: Jan Tue 23, 2007 8:34 am 
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Catfish wrote:
Leigh wrote:
Leigh, you missed the whole point. Read my quote again.

If we made a big deal of every typo that shows up on the board, we'd run out of disk space in a couple of days. :shock:

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 Post subject:
PostPosted: Jan Tue 23, 2007 12:34 pm 
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That thing appears to be a one tube crystal controlled transmitter. I recall seeing plans for it in a magazine once, but I have no idea of when and what magazine it was in. But CQ magazine does ring a bell. I think it was someone's 1960 vintage idea of the 1940's era QSL-40 transmitters that were written up in QST.
Curt

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 Post subject: Re: What is this?
PostPosted: Jan Tue 23, 2007 7:33 pm 
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Leigh wrote:
If we made a big deal of every typo that shows up on the board, we'd run out of disk space in a couple of days. :shock:


If you keep posting bs we'll run out of space too.


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 Post subject:
PostPosted: Jan Wed 24, 2007 1:57 am 
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Yeah, I think that is a socket for a crystal on top. I found some other pictures of cw transmitters and this one's circuit looks like them. Well, I don't have a ham liscence yet nor have I bought anything (intentionally) for it. So, can it be modified to be an am transmitter, or should I not modify it? It doesn't seem to be some rare and valuable item. Thanks.

Sorry to give the improper tube number. It's my fault. I didn't want to stir something up..........well, it may not be stirred yet, but it seems to be brewing.

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 Post subject:
PostPosted: Jan Wed 24, 2007 3:34 am 
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If there's a date code on the tube, it was probably bought for that project and would tell you roughly when it was made.

It has a late 1940s to early 50s look to my eye. The only decent index for this era is Rich Rosen's and he only lists QST articles back that far, not CQ. I checked a couple; there's one in 1952 built similarly but it uses a 6BQ6. CQ does seem likely.

Valuable? Probably not, but the parts aren't going to be very adaptable to a BC band rig.


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