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75.5.35.15
Does this mean the tube was made at the Blackburn plant in 1961?
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Thanks for the help.
No lower-case alphabetical letters in code. Reads: Upper-case letter eye, numeral six, numeral one. Upper-case letter bee, numeral nine, upper-case letter eye. Re-read previous replies or search this forum for codes or follow link below:
I have a few mullard 12ax7's with approximately that code, made in 1960. They have codes I61 B0K, short-plate. Have you misread the code? If the getter is held by 2 posts, I would hazard a guess that it is I61 B9I, made in 1959.
Hi ,
Unsure , recheck and report . The code should read I61 Bxxx or I63 Bxxxcheers
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