em85-2.jpg (14394 bytes) 

Magic eye for side view.
The fluorescent target is U-shaped and the anode is connected to a centered rod giving one shadow with varying angle depending upon the control voltage. Mainly used as a tuning indicator.  
Equivalent 6DH7, 6DU6
Similar type  
With different Vf HM85 = 12DH7
UM85 = 19DH7
CV number  
Swedish Mil.nr.