German WWII, WW2, Feldfernsprecher 33, FF33, field telephone

LA6NCA

WW2 GERMAN RADIO PAGE

German WW2 Telephone Equipment

Amtsanschließer 33

I think this is one of the finest telephones that are produced.

HD

Amtsanschließer 33 is here connected to my analogue SB telephone line.
I can now use it as a normal telephone.

Amtsanschließer 33 can be opened with a screw at the bottom of the device.

HD

Here is the Pulse Dialing System. A speed regulator ensures that the pulses are getting the right speed.

Amtsanschließer 33 underside. I got this devise from LA8AK’s collection.

Amtsanschließer 33 schematic

AMTSZUSATZ für den kleinen Klappenschrank zu 10 Ltg.

HD

This is a dialing device for the small 10-line telephone exchange.

All connection is on the top of the Amtszusatz device

Schematic diagram of the Amtszusatz device

My analogue telephone line is here connected to the Amtszusatz device.
An FF33 is connected to the Amtszusatz device. I can then use a FF33 as an ordinary SB
telephone for incoming and outgoing telephone calls.

This switchboard was used of the Norwegian army after the WW2.
The name is SB-10T, Nato number 5805-25-101-8968
Was in use in at least 30 years.

Inside the switchboard. Very nice cabling.

The wooden case. Very fine work.

I have here connected a FF33 to the switchboard.
My analogue telephone line is connected to the AMTSZUSATZ.
I can now use the FF33 as a normal telephone.

Here is the switchboard ready to use.
I have connected a DC-bell and a bell battery.
The bell and battery is for detection of incoming call on the SB line.

Here is the connection to the Amtszusatz device.
The SB line is connected to La/Lb.
The switchboard operator uses an FF33 to answer calls.
This FF33 is connected to Abrf. Connectors.
The bell is connected to W and the bell battery to WB.

This is a small switchboard for one line.
Two or more can be connected together.
Several FF33 can be connected together with this system.

Here is inside the Vermittlungskästchen.
FF33 can be connected at the terminals on the top of the unit.
Units can be connected together with the screw on the left and right side.
A “call memory” can be connected on top of the Vermittlungskästchen.
When an incoming cal is on the line, we can se it on the “call memory”.
A “call memory” reset button is on the top of the unit.

The “call memory” to the right comes from Silkeborg bad in Denmark.
This was the Wermacths headquarter in Denmark.
Aggerholm was the house where the Nachrichten/Stabshilferinnen live.
So when they call,„Aggerholm” shows in the display.

Here is the electrical scheme.
This is actually an end-pulse generator.
It sends a signal to switshboard operators to when the call is finished.
This system is not used anywhere anymore.
SB-Zusatz 33 can not be used for anything.
I therefore decided to change the device to a SB-interface for FF-33.
FF-33 can then be used in a standard analog line.

Switch contacts A and B are switched. A plastic insulator C must be implemented.
When you now lift the handset you will get a dial tone.
One can however only receive incoming calls with FF-33.

Feldfernsprecher 33 (FF33)

This field telephone is developed in 1933. It was used as standard telephone in the German army.
After the WW2 the Norwegian army used the FF33 until the 1970’s.

Inside the FF33.
From left: Inductor, bell and battery box.
Over the inductor is the audio transformer.
At the top of the telephone is the line terminal.

Here is the FF33 telephone receiver disassembled.

Battery box with the 1.5 Volt carbon/zink cell.

FF33 schematic diagram.