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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 traced out the radio again and made a change in the filament gain pots and to the first variocoupler tuner which is shown in orange.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. :Thanks :Steve :: :: :: :: ::INITIAL EXPLORATORY SCHEMA: :: :: ::  :: :: :: :: ::73's de Edd ::  :: :: |
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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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:::IPAddress: ***.224.37.32
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::IPAddress: ***.162.73.177
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:IPAddress: ***.224.37.32
IPAddress: ***.224.37.32
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