Recepteur Type RI 221

[Brianc]

That's a really fantastic set, Lawrence and I can appreciate the efforts which are going into your reverse engineering! It is the sort of receiver used in embassies the world over in the 1920s. I note that in the RF stages, the range switching is so arranged that there is never a shorted winding damping the others unlike the simple LW-SW switching of that era.
It reminds me of an ST&C Supersonic Heterodyne type 44004 from 1926 which I have. The set was specifically intended for FO type duties and was available with or without cabinet. I will upload the details to Radiomuseum in the near future as they have now corrected their entry for the Western Electric version of the set, the 4004, which was listed as a 44004. I have the curved labels which are positioned above each of the controls - but I can't find them at the moment   . The hole in the panel is for a two range meter which measures the two HT+ feeds. The valve are mostly WECO triodes in series/parallel on 4V LT.

[pwdrive]

I've reverse engineered everything now, the details will be on four separate sheets, the 1st sheet is shown below, it shows the schematic, it's a simplified schematic showing only the highest frequency range inductors in circuit, those correspond to wave change switch positions 1. The rest of the inductors and their switch details will be on sheets 2 & 3.

The schematic shows the receiver operating with four valves, it can also be configured as a two or three valve receiver by a selector switch on the control panel, that switching arrangement is not shown in the simplified schematic below, the details for that will be on sheet 4

All the common circuit elements except the above mentioned should be in the simplified schematic.....I hope

Sheets 2, 3 & 4 to follow:

   

Lawrence. EDIT: Thanks for the info Brian, interesting.

[AlanBeckett]

So, apart from the 'Wonderful' switching it's quite a straightforward Circuit.
Getting it going should be interesting.

Alan

[pwdrive]

That's it folks, complete with sticky plasters, warts'n all, it's tidier than my original preliminary circuit extraction.

Sheets 2, 3, & 4 now done and shown below, I've also included sheet 1 again to save jumping between posts, any circuit errors then let me know:

               

If I resurrect the receiver I'll have t give it some thought.



Juries still out on the cabinet origin, I'll take a closer look tomorrow and see wot's wot.

Lawrence.

[pwdrive]

Tried to find my computer drawing program, finally found but no symbols, finally found the symbols library so got stuck in, this was in the very early hours of this morning, anyways after a snooze I got stuck in.

Drawing's not turned out too bad, it's been a while since since I did computer drawing.

Below are the results, I've tried to include all the relevant info, if anyone spots any errors etc then please let me know.

   

Lawrence.

[AlanBeckett]

Wonderful.

Alan

[pwdrive]

Apart from some spelling mistakes etc Alan. I'll post a better one in a bit, what drawing software do you use?

Just realized it's xmas eve..!

Lawrence.

[pwdrive]

   


Lawrence.

[AlanBeckett]

An old copy of AutoCAD.

An Hour & 40 Minutes to Christmas Day.

Alan

[pwdrive]

Don't do xmas these days Alan, great when our kids were little and great when I was a kid, to me now it's just a boring sales pitch, we get a few food treats in and a bottle of stuff and that's about it.

The drawing I did was using Inkscape which was a free one some some years ago.

Lawrence.