Many radios from the 1920's were homebrew, made in someones garage. This sounds like one of them.
Since you mentioned 4 tuber, rather than 5 and variable inductor might be Browing Drake circuit? That variable inductor could be for feedback which gives extra gain?
You can find a lot of information on the internet about Browning Drake circuits. Australian collectors had a contest several years ago and built these radios. Here is some information:
http://www.clarion.org.au/browning-drake/
Norm
:Hello to e.body.
:I am trying to repair an old receiver I bought in Boston few years ago.
:It has no signs of brand or model name, so I guess it is a kit type device, from the schematics it seems to be a battery operated neutrodyne type.
:I browsed through some neutrodyne manufacturers schematics on nostalgiaairbut I failed to find anything really close to my schematic since they are sorted by manufacturer only and not by year.
:My receiver has 4 tubes type UX201(or maybe 3 UX201 and 1 UX112) with 1 RF amplifier, 1 RF amplifier+detector and 2 cascaded audio stages. It has 2 jack type headphone connectors and maybe a screw terminal connection to a high-impedance speaker.
:It has the following front panel controls:
:- filament power switch
:- antenna switch to top or center tap of 1st stage coil
:- variable tune capacitor on 1st RF amplifier stage
:- variable tune capacitor on 2nd RF stage (detector?)
:- variable coupling inductance on 2nd RF stage
:- 30 ohm rheostat of 1st RF amplifier filament
:- 30 ohm rheostat on RF detector/amplifier
:- 10 ohm rheostat on the two AF amplifier tubes
:I extracted the schematic, but it might have some errors since some connections are broken, and I have a pdf I can send by email and also some pictures.
:I would be very glad if you can help me finding the schematic or any model/manufacturer data that has wiring/appearance similar to my device. Thanks in advance
:
:
:Hi
:
: Many radios from the 1920's were homebrew, made in someones garage. This sounds like one of them.
:
: Since you mentioned 4 tuber, rather than 5 and variable inductor might be Browing Drake circuit? That variable inductor could be for feedback which gives extra gain?
:
: You can find a lot of information on the internet about Browning Drake circuits. Australian collectors had a contest several years ago and built these radios. Here is some information:
:
:http://www.clarion.org.au/browning-drake/
:
:Norm
:
::Hello to e.body.
::I am trying to repair an old receiver I bought in Boston few years ago.
::It has no signs of brand or model name, so I guess it is a kit type device, from the schematics it seems to be a battery operated neutrodyne type.
::I browsed through some neutrodyne manufacturers schematics on nostalgiaairbut I failed to find anything really close to my schematic since they are sorted by manufacturer only and not by year.
::My receiver has 4 tubes type UX201(or maybe 3 UX201 and 1 UX112) with 1 RF amplifier, 1 RF amplifier+detector and 2 cascaded audio stages. It has 2 jack type headphone connectors and maybe a screw terminal connection to a high-impedance speaker.
::It has the following front panel controls:
::- filament power switch
::- antenna switch to top or center tap of 1st stage coil
::- variable tune capacitor on 1st RF amplifier stage
::- variable tune capacitor on 2nd RF stage (detector?)
::- variable coupling inductance on 2nd RF stage
::- 30 ohm rheostat of 1st RF amplifier filament
::- 30 ohm rheostat on RF detector/amplifier
::- 10 ohm rheostat on the two AF amplifier tubes
::I extracted the schematic, but it might have some errors since some connections are broken, and I have a pdf I can send by email and also some pictures.
::I would be very glad if you can help me finding the schematic or any model/manufacturer data that has wiring/appearance similar to my device. Thanks in advance
::
::