EL84 EI Yugoslavia Output Pentode ( 6BQ5) from 80s
Without boxes, but tubes and printing on tubes are perfect! I’ve seen these tubes under a lot of various logos like Siemens, Philips . . . I suppose that these tubes are from beggining of 80s, ring getter with dual getter arms and getter wings, stapled plates in three spots, three slots on plates. I have two batches, KM4 1A & KM4 0L Philips codes. EI factory code (circle that is broken at the bottom, with a dot in the center) is printed in front of date codes!