The Fprüf. e was a single-frequency signal generator that was used to calibrate the local oscillator of the 10W.S.c,h & Ukw.E.e,h; 24 - 33 MHz. This signal generator employed a quarz 3.030 kHz.crystal to generate the necessary test frequency. The Fprüf. e was powered from the same source as the receiver and used a special power connector shown below.

 

 

The Fprüf.e data plate and special power socket.

 

 

Tube servicing and tuning adjustment lid.

 

 

Headphone jack.

 

 

This is a terminal to connect the an antenna for transmitting the test signal.

 

 

Cover off. Crystal measurement port and resistor can be seen in the bottom left corner.

 

 

Cover off. Crystal measurement terminal and resistor can be seen in the bottom right corner.