The Torn.Fu.d2 transceiver was introduced in 1936. It is one of the first models of the "new generation" of military radio devices developed by order of Adolf Hitler to re-arm Germany. The vacuum tubes in the Torn.Fu.d2 are the RV2P800 and the RL2T2 types.

The Torn.Fu.d2 uses one filament battery (2,4NC38) and two 90 Volt anode batteries.

Torn.Fu.d2 is a small, portable, high-frequency transceiver consisting of a three-stage transmitter and a six-tube super-heterodyne receiver.

Translated from "Die deutschen Funknachrichtenanlagen bis 1945 - Band 2 "Der Zweite Weltkrieg" by Fritz Trenkle

The Torn.Fu.d1 transceiver was introduced by Telefunken for signals training in the Infantry Signals School with a different schematic from the Torn.Fu.d. The Torn.Fu.d1 was introduced in 1936/37 with the frequency range of 33.8 - 38 MHz and was equipped with new Wehrmacht vacuum tubes. The tunable transmitter was designed with three stages (2 x RV2P800 and 1 x RL2T2). The six-tube heterodyne receiver featured HF, mixer, local oscillator, IF, detector and LF stages that utilized the RV2P800 pentodes. There was a two-stage filter with a quartz crystal between the mixer and IF stage.

With minor modifications (changed type description, IF filter without quartz, and the volume control in another position), the Torn.Fu.d2 was produced in large numbers from 1937 and distributed to the Infantry and Airforce (Heer and Luftwaffe). It was exported with the identification plate "ASE113". This transceiver featured separate scales for the receiver and transmitter, and the 33.8 - 38 MHz frequency range was not directly tuned, but corresponded to 100 channels (0-100) at 42 KHz increments. The transceiver was housed in a portable case and equipped with a set of six rod antennas and a base. The anode and filament batteries were carried in a separate accessary case along with the microphone, telegraphy key, headphones, antenna items, etc.,. The power cable was long enough to allow two soldiers to walk together while the radio and batteries were connected. Both cases weighed 18 kg. The range was about 4 km with the 0.4 W output of telephony operation, and about 10 km with 1W output during telegraphy operation. The receiver's sensitivity is around 3 micro-volts for 1 volt output voltage across 4000 Ohms.