Up for sale original WWII period German umformer E.U.a4 model. 

Were supplying power for Ukw.E.e receivers which worked with Fu 5 set.

Fu5 radios sets -  Ukw.Ee + E.U.a4 +10 Ws.C transmitter  were used in most type of Panzers  -

II/III/IV/ including Panthers and Tigers, and some models of armored halftracks like Sd.Kfz 251. 

Fu2 - itself  ultra short wave receiver Ukw.E.e + E.U.a4 + intercom. 

As well this type of umformer were used for supplying power for MW.E.c from Fu 8 radio sets for commanders tanks.

Excellent barn found, most probably working condition. Not tested. Check the pics.