This is possible by the higher heater current of Cas
perfectly matched pair of probably unused tubes
of course I cannot be sure if the tubes were used or not,
but they look great and tested 150% and perfectly matched.
every of these tubes had it's own number - these tubes have pretty closely matched numbers:
82635 and 83133
made by VALVO Germany
these are extremely rare and beautiful sounding DHT in this shape
one of the best money can buy

tubes are in a great electrical and visual shape(as you can see at the pictures.
tested with the great 150% results, perfectly matched:
tube 1 Ia = 30mA
tube 2 Ia = 32mA
where 100% for the new tube is 20mA
Vf=3,6V / Ua = 250V / Ug1 = -12V
These are 4-pin Europe B4 base version of the tubes
same as RE604, RE134, and other known DHT's
base pinout and characteristics of the tubes you can see on the pictures
you will get the tubes you can see at the pictures
Price is for the matched pair (2 tubes)
I always send the tubes by priority registered mail with tracking number within hours after receiving payment