My Telefunken mystery tube

Tubes Asylum

Questions about tubes and gear that glows. FAQ

Is there any way to visually identity a TFK 12ax7 vs 12au7 ribbed plate? I have a tube with absolutely zero label left except a tiny part of the TFK diamond label so I not sure what this tube is. I only have a Orange tube tester which isn't of much help but the tube tested "ok" as a 12ax7 by that tester. I only have another TFK ECC83 smooth plate to compare with here at home. So any help I'd appreciate
Sitting here on the Group W bench

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Topic - My Telefunken mystery tube - Permanent Waves 19:21:24 04/22/17 (4)

RE: Also try the freezer for a minute or 2 - DAK 17:30:05 04/23/17 (0)

RE: My Telefunken mystery tube - Michael Samra 22:13:12 04/22/17 (0)

Exhale onto the tube.... - viridian 21:54:35 04/22/17 (0)

RE: My Telefunken mystery tube - Tre' 20:58:45 04/22/17 (0)

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