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 Post subject: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Wed 22, 2012 7:45 am 
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Joined: Mar Sat 26, 2011 4:28 am
Posts: 188
Location: Lompoc, CA
Does anyone know where I can get a schematic for this radio!! Just picked it up and would like to start working on it!!Actually its an Emerson 646 Series B I got the maker of the radio mixed up!!

Thanks in advance


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 Post subject: Re: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Wed 22, 2012 2:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2565
Location: Northern Panhandle, WV
The schematic is in Beitman 1951, page 30:
http://makearadio.com/beitmans/index.php

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Carl


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 Post subject: Re: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Wed 22, 2012 11:30 pm 
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Joined: Mar Sat 26, 2011 4:28 am
Posts: 188
Location: Lompoc, CA
Thanks Carl got it


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 Post subject: Wires on 1950 Emerson 646 Series b Radio
PostPosted: Feb Fri 24, 2012 12:15 am 
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Joined: Mar Sat 26, 2011 4:28 am
Posts: 188
Location: Lompoc, CA
Hi, I have another Question on this radio!! I have a shematic but its not very good!! The question is where do these two wires that are circled get connected? Can't really tell from the Schematic its to small and hard to read!! Any help would be great!!Image is clickable!!

Thanks in advance,
John

Image


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 Post subject: Re: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Fri 24, 2012 9:51 am 
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Joined: Feb Tue 24, 2009 8:20 am
Posts: 7727
Location: Aurora Colorado
You came make the schematic larger by using your ctrl key and the plus sign. And where do the wires end up?

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 Post subject: Re: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Fri 24, 2012 4:43 pm 
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Joined: Mar Sat 26, 2011 4:28 am
Posts: 188
Location: Lompoc, CA
Yep I tried that still can't read it to clearly!! The blue wire is connected to V-4 3v4 with orange wire you see in the picture. the orange wire goes to the transformer and the tan wire is connected to the tube socket right next to the IF cam,if that helps!Tan wire is connected ito the tube socket V-3 IU5!! right under the green wire in the back with a knot in it!!need to know where the other ends go!!Both the tan and the blue wire look like they are connected to pin 7!!


Thanks again hope this helps


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 Post subject: Re: Schematic for a 1950 Moterola 646 Series b Radio
PostPosted: Feb Fri 24, 2012 11:59 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8701
Location: SoCal, 91387
I have a couple of these. There should be six wires exiting from the back of the chassis; a green, from it's own hole, going to the antenna loop, and from the larger hole, beige or yellow going to the other side of the loop, red and white to the B battery terminals, and yellow and black to the A terminals. Exiting above the board and connecting to the output transformer are a blue, and red.

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