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Antique Radio Technical Forum
1920's Home Brew Radio

Posted by Edd on 04/27/2010 22:33











Sir Steve . . . . . .

Just sort of initially looked at your pics and saw that the schema was too small to work with so I blew it up to viewing size and made a few initial insertions and we can clarify from there, as we progress.


Also thought that you had a broken tube socket, but it was just the way that the pictires clustered all up together.


Aside:


Next time . . if you will put a couple of < br >'s between the separate URL's, that will line them up vertically.


But I had to put 2 sets 3 dummy spaces in that above format to keep it from activating . . the end result needs to be all jammed together with no spaces.


Just read my naked text in a post reply dialogue box and you can see several examples.


PLUS you left off the required little > "tailer",after jpg on the URL.


End aside:


I am not yet fully sure of the tie ins of the batteries except the B+.


As you had drawn the first variocoupler tuner you had the unit shorted out on the secondary . . . confirm ?

On the 1st RF stage the 1st grid is floating of any biasing.


Also the Plate is not receiving any B+ unless one power connection is assigned as ***


The AQUA and ORANGE dots are signifying of that wiring path seeming to not being correct ?


All of the lines with the GREEN dots seem to be correct.


*** IF I were to assign a sub B+ connection . . . as is being designated . . . that will get a plate supply voltage to the plate of the RF stage as you can see by following the BLUE dotted path..


BUT . . as is shown . . . the output coupling capacitor from the 2nd RF variocoupler would be dumping into a low Z B+ supply line !

The FUSCIA path seems to work as being a common line buss.

Now, could you reconfirm the lines that are not marked as well as the AQUA and ORANGE dotted paths ?

Then we can alter the preliminary working shama to confirm . . . . .


INITIAL EXPLORATORY SCHEMA:





73's de Edd








I have a home brew 1920’s radio. I drew a schematic of this radio which is included below with some pictures. The tuning condensers may not be shown correctly but this seemed to be what I trace out with my Fluke. One of the tuning condensers has the name of Univerier on it. I have a couple of wires that are not hooked to anything and are labeled with?????. I’m not sure of how to connect the batteries. I believe the filament should be a 3 volt battery and the plate should be a 45 volt battery. The tubes are missing. I’m guessing that they should be UV-199’s. I’m not sure of where the headset should connect. Can anyone give me some guidance in getting this radio playing again? Also where can I purchase three tubes?


:Thanks
:Steve


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:IPAddress: ***.224.37.32

IPAddress: ***.162.73.177


1920's Home Brew Radio 
Steve 04/27/2010 17:17 
Edd 04/27/2010 22:33 
Steve 04/28/2010 16:03 
Steve 04/29/2010 15:30 
Steve 04/29/2010 15:43 

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