Telefunken 12AX7/ECC83-- possible counterfeit?

Tubes Asylum

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Was just looking at three different batches of Telefunken 12AX7's I have. One type is used and labelled "Dynaco"; the other type is labelled "Telefunken (the diamond logo), 12AX7/ECC83, Made in West-Germany", date coded "FL" and are pulls from a Harmon Kardon amp; the third are NOS Telefunken "Selected" tubes w/ the tips of the envelope painted orange-red and a "Selected" cloth sticker on each tube, these are labelled "Telefunken (diamond logo, slightly smaller than the other), Made in Western Germany, ECC83/12AX7" w/ date code "BRC01Wa". The first two types look indentical, but the third type has small differences in the plate from the first two. Also, the third type has four barely noticeable crimps in the tops of the tubes, so subtle that I just noticed them tonight and I've had them for months. I've never heard of TF 12AX7's w/ crimps in the tops, they have the diamond and say "Made in Western Germany"-- are these counterfeit? Or are they just made at a different factory or at a different time?

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Topic - Telefunken 12AX7/ECC83-- possible counterfeit? - 8eyedspy 00:36:30 09/07/03 (3)

Re: Telefunken 12AX7/ECC83-- possible counterfeit? - steve oda 10:43:55 09/07/03 (2)

Re: Telefunken 12AX7/ECC83-- possible counterfeit? - 8eyedspy 12:03:46 09/07/03 (0)

Re: Telefunken 12AX7/ECC83-- possible counterfeit? - volkerjeschkeit@dnet.it 11:53:40 09/07/03 (0)

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