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 Post subject: 1925/6 Priess Straight 8 schematic
PostPosted: Jan Tue 10, 2017 9:46 pm 
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I took my time and studied the chassis when drawing the following schematic, and would appreciate reviews of it to see if it looks reasonable. As far as I can tell, this is the only schematic for that model on the Internet.

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Last edited by FStephenMasek on Jan Wed 11, 2017 7:56 pm, edited 2 times in total.

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 Post subject: Re: 1925/6 Preiss Straight schematic
PostPosted: Jan Wed 11, 2017 4:38 am 
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Hi Stephen,

That circuit certainly looks plausible, although it's always possible that I've overlooked something. Interesting how it switches the last audio stage in and out for "loud" vs "soft" operation.

That's a lot of untuned gain stages. I wonder how stable it is?

Do you have a picture of the set? I don't see this manufacturer listed at Radiomuseum, so it must be a rare one. (Correction: I see it is listed under North American Radio Corp., or "Narco," although no models are shown.)

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 Post subject: Re: 1925/6 Preiss Straight schematic
PostPosted: Jan Wed 11, 2017 5:14 pm 
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The manufacturer is on Radiomuseum.

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 Post subject: Re: 1925/6 Preiss Straight schematic
PostPosted: Jan Wed 11, 2017 5:56 pm 
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Look over this diagram. I realize it's a nine tube unit but much of it may correspond to your radio since it is from the same source.


Attachments:
Priess Radio.jpg
Priess Radio.jpg [ 62.24 KiB | Viewed 258 times ]

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 Post subject: Re: 1925/6 Preiss Straight 8 schematic
PostPosted: Jan Wed 11, 2017 7:22 pm 
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Wow, I had not found that 9-tube schematic. Please send a scan or the source, as the image on ARF is unreadable when enlarged.

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 Post subject: Re: 1925/6 Preiss Straight 8 schematic
PostPosted: Jan Wed 11, 2017 7:31 pm 
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Some of the confusion on finding this hinges on the spelling. It's "Priess," not "Preiss."

One of the ads here links Priess and North American Radio Corp. (Narco), although others do not, and mention simply "Priess Radio Corp."

https://books.google.com/books?id=OMqvQ ... io&f=false

Wonder if the two are one and the same?

The Straight 9 schematic is at Radiomuseum: http://www.radiomuseum.org/r/priess_str ... del_r.html

And pictures of the Straight 8 are here: http://www.radiomuseum.org/r/priess_str ... pr4_t.html and here: http://www.radiomuseum.org/r/priess_str ... small.html .

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 Post subject: Re: 1925/6 Priess Straight 8 schematic
PostPosted: Jan Wed 11, 2017 7:57 pm 
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I corrected the spelling in this thread title. Thanks for catching that!

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 Post subject: Re: 1925/6 Preiss Straight 8 schematic
PostPosted: Jan Wed 11, 2017 8:26 pm 
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FStephenMasek wrote:
Wow, I had not found that 9-tube schematic. Please send a scan or the source, as the image on ARF is unreadable when enlarged.



I found it in Gernsback Manual, Volume1, Page 357. A source for your 8 tube radio was mentioned above so the 9 tube version would not be needed any longer.

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 Post subject: Re: 1925/6 Priess Straight 8 schematic
PostPosted: Jan Wed 11, 2017 10:05 pm 
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RM doesn't have a schematic for the 8 tube model.

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 Post subject: Re: 1925/6 Priess Straight 8 schematic
PostPosted: Jan Thu 12, 2017 3:31 am 
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I worked on a Straight 8 for a friend maybe 5/7 years ago. It has the oldest coaxial antenna feed from the loop I can ever recall seeing. The untuned RF gain stages seemed to have no net gain :shock: I could not spend much time on it so it went back to the guy working only on a couple of local stations. I only have a couple of shots of the underside of the chassis... I did not attempt to trace the schematic completely.

Robert


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 Post subject: Re: 1925/6 Priess Straight 8 schematic
PostPosted: Jan Thu 12, 2017 3:50 pm 
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Ebaman has all the Gernsback Manuals for download at ebaman.com
Registration is easy and there is a tremendous volume of information available. Definitely an excellent place to sign up.

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 Post subject: Re: 1925/6 Priess Straight 8 schematic
PostPosted: Feb Tue 14, 2017 3:42 pm 
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It is playing. It seems to work best with the voltage of -4.5. I need to adjust the trimmer and fiddle with it, but it is nice to hear it playing, probably after many years of silence.

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