No info about factory , this tube maybe produced in one east european associated plant, Tungsram?
Photos show some comparabla particular of construction.
Hi, someone
knows us as "gibrilla-it", we have added a new nick to better follow
the tube world, our feedbacks are 100%, never neutral or negative feedback.
Contact us for information. Our website is www.oldtimeradio.it. Greetings
A&G