Tornistor Empfanger b (Bertha ).
The receiver is build in 1940 by Telefunken.
This shortwave receiver is a direct conversion, 2 stages HF , 1 “Audion” detector and a LF stage. All tubes are of the type RV2P800. The feedback or reaction gain in the detector stage is tuneble with the little knob below the small scale of it. This makes the receiver suitable for CW and even SSB and becomes then very sensitive and selectief.
It is a very well working receiver for listning at the amateurbands.
The headphones is the DFha. The elements have an impedance of 2000 ohm.
It is used by the army (Wehrmacht) in the field, it could be carried on transport, at the back of the wireless operator.
It was also used in radio vehicles as a mobil station.
Tornistor Empfanger Bertha from 1940.
This is the vibrator powersupply, type EWc, for 12 volt DC. Used in vehicles.
View on the upperside of the EWc. Left the vibrator and filement resistor lamp. At the right the spares.
Here in the mid, the vibrator powersupply, type EWb. In use for the Torn. Eb in portable situaties. The supply is the 2 volt DC from a lead battery. This battery is shown at the left, type 2B38. At the right a copy of the HT static battery for 90 volts DC.
All the 3 item are housed in a special battery case, mounted just under the receiver.