Problem with German W28

[LM Ericsson]

 I picked up a German w28 for $60 at the Lancaster telephone show this weekend. It is such a beautiful telephone and telephone I have been looking for for a long time. I don't know exactly the make of this telephone. I cannot tell the logo as indicated in the photos. This phone is in great condition, but there is a problem. The switchook plunger is completely broken off (It was like this when I bought it). I tried screwing it back in, but  the threads are completely stripped. Could this be easily repairable. If not, where could I find a replacement?

[WesternElectricBen]

Couldn't you just remove the switchook bolt and 'size it up.' Meaning, find the bolt that is exactly the step up, so it will open up the socket just enough to create a new thread.

Ben

[Matilo Telephones]

Great find! Looks to be in very good condition.

Richard Bosse and Company. The capacitor has 1940 on it. Probably its production date or there abouts.

Is it an ex-reichspost machine? Do you have a pic of the base plate?

I'm not sure what the problem is. Is it the thread on the bolt? Or the thread in the cradle? Or both?

There is a German maker that still makes new parts for the W48. It may have the same bakelite cradle part:

http://www.telefonmanufaktur.de/shop/index.php?cPath=25&sort=2a&page=2&osCsid=ggvj1v4n9p7ulphl00m2aqcof7

[dsk]

Looks like a nice version, the dual capacitor indicates a filter on the dial.

Are you able to read the ohm value at the ringer coils?
(300 on each coil are a common value, this may give a high REN load)

For me, it looks like the threads in the bakelite are the problem, if so epoxy may solve it.

Does your phone block the dial in on hook position?

dsk

[Matilo Telephones]

Next to the capacitor, top of the picture, is a selector mechanism with 3 screws and a small brass plate. What does that do?

[dsk]

Are there any wiring diagram there, (often glued to the bottom plate.)

dsk

[Matilo Telephones]

Oh dear, we are asking a lot of questions, now, aren't we?

[LM Ericsson]

 I took pics of the wiring diagram and the switchhook problem. The switchhook plunger's screwhole is completely stripped and won't stay on the threaded bolt. Seems to me the last person who owned this phone messed with it by putting in superglue which obviously did not work. Whenever I attach the plunger to the bolt, it will be completely stuck and will not move up and down freely. In other words, if I take the phone off the hook, the switchhook does not move up.
.

[LM Ericsson]

Next to the capacitor, top of the picture, is a selector mechanism with 3 screws and a small brass plate. What does that do?

I guess it transfers other wires' connections to the other terminals.

[Matilo Telephones]

Thanks.

That bolt rests on the hookswitch. Part of the hookswitch is a spring leaf. That operates the hookswitch and pushes the rod up, if the handset is picked up. Seems that the springleaf is not working or the hookswitch is misaligned.

Often the bolt is a bit loose from the cradle. That moving around probably destroyed the thread. I agree with Dag, epoxy resin is a good solution to that problem. Clean both parts wel first.

If it is not too much to ask, do you have a pic of the hookswitch?

[dsk]

Next to the capacitor, top of the picture, is a selector mechanism with 3 screws and a small brass plate. What does that do?

It looks like it is a loop length compensation adjustment, putting in or out a capacitor in parallel with the resistor in the coil.

dsk

[dsk]

Try to clean (sand and oil) the rod.

dsk

[Matilo Telephones]

If that rod is stuck in the tube, I would also inspect and clean that tube.

[LM Ericsson]

Picture of the hookswitch

[dsk]

I took some pictures from a part telephone I have:
And made some arrows on your picture.
1 Spring who lifts the cradle.
2 Stopper, to stop the spring in the perfect lifted position.
x contact sets not on mine.

dsk