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Original Message
Nice tube!
Posted by samstone on September 24, 2020 at 07:25:58:
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.