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← Germany WWII Abwehr
The set consists of an S-74/12 transmitter with an output power of 12 Watts,
an E-74 receiver and a matching mains power supply unit (PSU),
mounted together in an unobtrusive suitcase.
At present we do not have a picture of this suitcase radio set,
but from surviving documents in the British National Archives, we know
some of its properties [1]. When German spy Franz Mayr was arrested in
Iran (Persia) in August 1943, he was in possesion of a large quantity
of paperwork – including
instructions for the SE-74/12 –
most of which were translated by MI5/MI6 [1].
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It is very likely that these instructions were for the SE-74/12 radio sets
that had previously been used by the German Embassy in Tehran (Iran).
When the Germans were forced to leave Iran, they handed the radios over
to the Japanese, who kept them until they were forced to leave as well.
When the radios finally ended up in the hands of the British, they
were no longer operational.
It is believed that the circuit diagram of the transmitter is similar
to that of the S-87/20
that was released in 1939, given the fact that the
same valves (tubes) are used in the design. The output power of the S-74/12
is somewhat lower than that of the S-87/20 — it delivers 12W instead of 20W —
because standard valves were used, whilst the S-87/20
came with special selected valves.
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OKW = Oberkommando der Wehrmacht (Supreme Command of the Armed
Forces) in Nazi Germany during the Second World War.
Aussenstelle = Outpost.
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PLEASE HELP —
At present no further information about the SE-74/12 is available and we
have so far never seen a picture of the set. From surviving documents we
know that it existed, however. If you have any information,
documentation or image(s) that might help us to expand this page, please
contact us.
Output 12 Watts
Valves EDD11, 2 x EL11 (or EL12)
Stages Oscillator, Power Amplifier (PA)
Frequency 4,730 - 7,530 kHz and 8,020 - 12,640 kHz
Tuning Variable Frequency Oscillator (VFO)
Antenna Symmetrical dipole (wire)
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Valves 3 x EF12
Stages RF amplifier, Detector, AF amplifier
Frequency 4,250 - 13,650 kHz
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Input 220V AC (other voltages available)
Valve AZ12 (rectifier), GR150 (stabilizer for RX voltage)
Fuses 2 A (input), 500 mA (output)
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Obtained from Frank's Electron Tube Pages [3].
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© Crypto Museum. Created: Friday 30 March 2018. Last changed: Saturday, 12 May 2018 - 16:12 CET.
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