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In Reply to: RE: Help Identifying 12AX7 tubes posted by lehmanhill on September 23, 2020 at 15:12:11:

Yes the manufactring codes can be tricky to figure out sometimes. I have some tubes that are re-branded to one manufacturer and are actually another. GE and Sylvania did this on more than one occasion. The trick that Jim mentioned is finding the code. IIRC GE is "188", Sylvania is "312", RCA is "274", Raytheon is "280". Again I could be off on my numbering, but somewhere online is a tube manufactring ID chart.

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Follow Ups Full Thread

Topic - Help Identifying 12AX7 tubes - lehmanhill 09:21:52 09/22/20 (7)

RE: Help Identifying 12AX7 tubes - Jim McShane 17:11:01 09/22/20 (6)

RE: Help Identifying 12AX7 tubes - Tom Bavis 07:34:46 09/23/20 (5)

RE: Help Identifying 12AX7 tubes - lehmanhill 08:55:37 09/23/20 (4)

RE: Help Identifying 12AX7 tubes - Jim McShane 11:50:38 09/23/20 (3)

RE: Help Identifying 12AX7 tubes - lehmanhill 15:12:11 09/23/20 (2)

Nice tube! - samstone 09/24/2007:25:58 09/24/20 (1)

RE: Nice tube! - lehmanhill 11:44:59 09/24/20 (0)

Follow Ups

Nice tube! - samstone 09/24/2007:25:58 09/24/20 (1)

RE: Nice tube! - lehmanhill 11:44:59 09/24/20 (0)

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