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it's a early telefunken ecc81.the bottom is too narrow,missing a B,the code should be YKB ⊥6,so it's a telefunken ecc81 made in AUG,1953.
These Telefunken marked with philips codes are pretty rare, only about half dozen times I've seen these in about 20 years of tube collecting!
THis small tube had a paper label. One must remove the paper label before use the tube to avoid over heating??
Hi FULLRANGEMAN.I might be wrong (Won't be the first time - neither the last time) but look to me like thick textured paint, not paper ? ? ?Guy 13
Hi Guy,It was a paper sticker
Yes B329 made by Brimar
Siemens E82CC black plates gold pins