Original Philips Miniwatt CK1
used tube
OCTODE Frequency converter Controlling (mu)
UK1 13M1 UGDR
made by Philips Holand
The tubes seem to be unused, or used slightly tested with the great near 100% results:
tube 1 Ia = 7,8mA
where 100% for the new tube is 8mA
the tube is in a great technical shape.
the tube has Europe side contact base P8A
you will get the tube you can see at the pictures
I always send the tubes by priority registered mail with tracking number within hours after receiving payment