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: : : :  : : : : : : : :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 ? : : Your drawing is correct. I traced it out incorrectly. : : :On the 1st RF stage the 1st grid is floating of any biasing. : : There is no grid biasing resistor. : : :Also the Plate is not receiving any B+ unless one power connection is assigned as *** : This is the way it is wired. : :The AQUA and ORANGE dots are signifying of that wiring path seeming to not being correct ? : Again this is the way it is wired. Is it possible that this radio never worked? : :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 . . . . . I have repaired several 1930's and newer radios but this is my first 1920 battery radio. With it being a homebrew makes it even more of a challenge. : : :  : |
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: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?
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::Thanks
::Steve
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::IPAddress: ***.224.37.32
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:IPAddress: ***.162.73.177
IPAddress: ***.224.37.32
| 1920's Home Brew Radio | |
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