I have 2 strange brand 6SN7GT which is said CBS/Hytron. The printed brand is Premier, date code 5-56. If this date code is correct then this should be bought from other brand and resold under CBS/Hytron cause at this time, CBS/Hytron stopped manufacturing tubes themselves. I cannot find out which is the tube original brand cause the top round mica with spikes and the bottom round mica look quite strange.
Please help to give your comment.
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