Identification of components in old radio

Thread Starter

Andreas Madsen

Joined Sep 6, 2020
11
The 2 schematic diagrams on the BBELTSPOLE device have nothing to do with this radio. Dobbetspole makes sense, 2 variable air caps and a tapped or dual inductors for tuning. Is the can a switch and not a free turning shaft as on a potentiometer? How many switch positions?
It is not completely free turning. It can only turn about 45 degrees, but it feels like there is a small click in between the two outer positions, so it might be a switch with two or three positions.
 

SamR

Joined Mar 19, 2019
3,411
From looking at the period schematic and at the back of the DOBBLETSPOLE device, I'd bet it is only a 2 pole switch as there isn't a lot of space there for the typical coil of the period. The black 4 hole device is a Vacuum Tube Socket and the only tube socket I see. So it would be a 1 tube (likely O1A tetrode) radio, not the multiple tubes shown on the dobbeltspole can. Mikafarad definately says capacitor although the other end of both are not connected. Maybe for coil connection? There are a lot of pin connections on the front panel. More than just the 2 for a headset and for the antenna? I'd be very careful turning anything until it gets cleaned and lubricated. Would love to see and hear it restored and working again.

Link to Mikafarad Capictors https://www.radiomuseum.org/r/dralowid_dralowid_mikafarad_stabkondensator.html
 

SamR

Joined Mar 19, 2019
3,411

KeithWalker

Joined Jul 10, 2017
1,789
I don't know what the thing at the bottom right of the image is, but I have taken a better picture of it. It has some letters around the edge (G, F, A and F as far as I can tell):
View attachment 216509
I don't know what the "can" is, but as "SPOLE" means "coil" in Danish (the radio and I are from Denmark) I am guessing it might be some sort of coil. As bertus has also mentioned, the full word might be "DOBBELTSPOLE", meaning "DOUBLE COIL", though I don't know what that is.
The picture is of the plug-in base for a triode. G = grid, A = anode and F = filament.
This is a single tube receiver, not the three-stage one shown in the diagram on the can..
Keith
 
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Thread Starter

Andreas Madsen

Joined Sep 6, 2020
11
I'm pretty sure what you have is a very early model single tube Dux Radio from Sweden that was made in the early 1920s. Their first unbranded radios are from 1922. I found later model 2 and 3 tube radios here: https://www.radiomuseum.org/r/dux_d_ii.html
The case and faceplate layout are very similar and these radios were made ~1926-7 and would be improved models of what you have. https://radiomuseum.se/?mode=museet&sub=collection&thisis=5&fabrikat=10000
Interesting. It sound very plausible as they are indeed very alike.
 

sagor

Joined Mar 10, 2019
439
WD-11 tubes are very rare, expensive, and fragile "electrically". The filament tends to short out.
There are articles on the Internet on how to substitute other cheaper, older tubes (1A5 or 1Q5) to a WD-11 socket and make them work. Can't find the link right now, but there is a good one out there, and socket adapters for the WD-11 can be found on Ebay. Seems to be a common conversion.
https://www.radiomuseum.org/forum/wd_11_tube_adaptor_template_mold.html
 
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