Original TELEFUNKEN RES 094 used tubes H406D
closely matched pair from February 1938 - same code "zl"
      Screen-grid tetrode   RF/IF-Stage
Vf 4 Volts / If 0.06 Ampere 
 the tubes are used, 100% + emission:
 tube 1 - Ia = 4,0mA
 tube 2 - Ia = 5,0mA
where 100% for the new tube is 4,0mA
the tubes have Europe 4-Pin (4A, B4) base, top contact screw type
you will get the tubes you can see at the pictures
I always send the tubes by priority registered mail with tracking number within hours after receiving payment

                                                                                                                Santic [feat. Vera Hall] – Trouble So Hard