Author Topic: Amtsanschließer 33 German wwii telephone / trunk  (Read 254 times)

Offline dsk

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Amtsanschließer 33 German wwii telephone / trunk
« on: April 25, 2019, 11:41:09 AM »
The Amtsanschließer 33 or Amtsanschliesser 33 is a combined CB telephone and a trunk for connecting the LB field telephones or fieldexchange to:
1) a cb system
or
2) an LB system with automatic ring-off.  (This system closes a dc path when the caller goes on hook, but runs the off hook signals trough a capacitor, totally opposite of what a CB system does.

The right one her is the Amtsanschließer 33
The German WWii alterantive is the Amtzusats 333: https://bre.is/CjpcYQq3j
« Last Edit: April 26, 2019, 03:17:35 PM by dsk »

Offline dsk

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Re: Amtsanschließer 33 German wwii telephone / trunk
« Reply #1 on: April 26, 2019, 03:04:57 AM »
I got a question about using the capacitors C1 and C2 as the isolation between CB and LB circuit.
I would have used a transformer if I should design the circuit, and that is also done in newer circuits. 
On the other hand, the US SB-22 board also use a capacitor for this purpose.

In a modern circuit containing semiconductors the transformer will protect better.

dsk

Offline 19and41

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Re: Amtsanschließer 33 German wwii telephone / trunk
« Reply #2 on: April 26, 2019, 02:57:43 PM »
Your link was to a thread about your German Dial phone with the field phone handset.  Could you put up the info on your new dialer? ;)
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline countryman

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Re: Amtsanschließer - Amtsanschliesser 33 German wwii telephone / trunk
« Reply #3 on: April 29, 2019, 08:15:13 AM »
Here are some more pics.
This individual set is stamped "DR" (Deutsche Reichsbahn, german railway) - 1940. (DR later became DB in West Germany, in the east the "Reichsbahn" name persisted) The railway used LB phones and also an automatic exchange separate from the public phone system, called BASA. My guess is that this set was used for years after WW II by the west german "DB" railway as a trunk between both systems. I have it from a junk dealer from Hagen, which is a major railway junction. The (younger) receiver element is stamped with a DB logo. There is a sticker "Fw München-Aubing" inside, where it may have been refurbished.
The whole unit was covered with the thickest layer of cigarette tar I ever saw. Did I destroy the patina by cleaning it ;-) ?
The "Klinke" plugs are very similar to regular phone jacks, but a little longer.

Offline 19and41

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Re: Amtsanschließer 33 German wwii telephone / trunk
« Reply #4 on: April 29, 2019, 09:23:29 AM »
Nice looking phone.  I think when that material is clean, it allows one to see how it was made with fabric being part of the material.  I would think that would have more interest than the remains of the tobacco smoke.  The phones of this type I see here, I have not seen anywhere else before.  Thanks for sharing the pictures.
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke

Offline dsk

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Re: Amtsanschließer 33 German wwii telephone / trunk
« Reply #5 on: April 29, 2019, 10:16:17 AM »
Looks like it just was upgrade to get it cleaned.  ;)
The only jack you may need will be the Vermittlungsklinke, and yes a 1/4" plug fits...almost.  You ma get one of those with molded plastic, and trim off a little, and it fits. (or you may adjust the jack in the phone)  Then it will actually fit as a trunk for the American field exchange SB-22/PT to.  ;D 


Not sure about what handset DB used, but this is different from what the German forces used. (maybe older)


dsk


PS, the capacitors may be bad, smart to test if you think about using it.  DS

Offline countryman

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Re: Amtsanschließer 33 German wwii telephone / trunk
« Reply #6 on: April 29, 2019, 12:33:04 PM »
Thanks for the tip! The caps test OK so far (with low voltage) but I do not plan to use it as a trunk to field phones. As you stated above, even good capacitors are a poor protection, more so when the phone is hooked to a computer system like I do.
Indeed the handset does not look original. It should have a push-to-talk switch. It looks like a W28 handset (older Siemens model).
It is often said that he "shabby" look comes from inferior materials. But in fact the phone survived almost 80 years, some obviously under rough conditions, without cracks and the bakelite still has a certain flexibility.  My guess is, the military just did not want a glossy black look. 
The pic is from the cleaning operations. I used plastics cleaner in a pump spray can, like suggested for outdoor furniture etc., that worked good.