Made by Mullard in England for Telefunken in West Germany. Single halo getter, welded plates, hole in guide pin, and matching XF2/B date codes (b1b2). Perfect graphics!
Tested on West German Neuberger RPM 370 tube tester with excellent results. They test around 104 - new tube starts from 100. One tube has less deposit on the top. I put these in my amp, they biased equally and sound great.
SOLD!
