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 Post subject: Radio electronic engineering Nov1948
PostPosted: Apr Thu 25, 2019 4:55 am 
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Location: Lexington KY
By any chance does anyone have a copy of Radio electronic engineering Nov. 1948 ???

Theres an article in it on the Cross Coupled phase splitter developed by J.N. van Scoyoc and appeared the first time in Radio electronic engineering. The original design apparently used an input transformer, I'd like to see how it looked.

Most of these issues are on line. Sadly 1948 is blank.

https://www.americanradiohistory.com/Ra ... r_Page.htm


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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: Apr Thu 25, 2019 5:19 am 
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Joined: Feb Sun 05, 2012 5:12 pm
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Location: North Syracuse NY 13212
I do have this article from November 1948.
Here's a screen shot of the first page. It's a 456KB PDF file.
I'm not sure if I can attach it here, but if I can't, I can email it to you.

Attachment:
CCimage.jpg
CCimage.jpg [ 152.89 KiB | Viewed 447 times ]


Bob

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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: Apr Thu 25, 2019 5:36 am 
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http://bit.ly/2W8O1C8

Awesome that's it.


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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: Apr Thu 25, 2019 4:02 pm 
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That's it all right, but how did you find the whole article? I only posted a screen shot!
I don't remember where I got my copy, but it was in 2013. Whenever I find these articles, I just save them.

Bob

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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: Apr Thu 25, 2019 9:57 pm 
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Location: Lexington KY
Elvirafan wrote:
That's it all right, but how did you find the whole article? I only posted a screen shot!
I don't remember where I got my copy, but it was in 2013. Whenever I find these articles, I just save them.

Bob


Click on this link---------> http://bit.ly/2W8O1C8


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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: May Tue 14, 2019 7:16 pm 
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Location: Thornhill, Ontario, Canada
The 15 watt amplifier is interesting, but few, if any, of our commonly available OPT's have the extra "10% FB winding". However, I wonder if the regular speaker secondary could be used for this, i.e. ground the 4 ohm tap (the voltage centre tap of a 16 ohm OPT secondary winding) and feed back from the "0" ohm and 16 ohm connections... It's well under the "10%" quoted, but I've not done any design calculations to see if it is feasible.
Cheers,
Roger

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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: May Wed 15, 2019 2:56 pm 
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Location: Metamora MI, 48455
I'm genuinely curious which output transformer the author was using as the only "off the shelf" transformers, from that era anyway, that I know of with tertiary feedback windings were the Chicago PCO-80, PCO-150, and PCO-200, none of which have a center tapped feedback winding.


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 Post subject: Re: Radio electronic engineering Nov1948
PostPosted: May Thu 16, 2019 4:13 pm 
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Location: near ST Louis Mo 62002
Most likely the output transfomer has a 500 Ohm center tapped secondary winding . I have two pairs of Fisher output transfomers from the early 50's that have tertiary CT feedback windings .

I am using one pair with 6B4Gs PP , the other pair I want to use with WE300Bs if my hands ever quit trembling .

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