franzbassist Posted May 16 Share Posted May 16 (edited) I've had these a while, using them in various amps with valve preamp stages, but my move away from such amps means they are now surplus: Mullard ECC83 - code B6B3 means made in Blackburn, third week of February in either 1956, 1966 or 1976 = £50 Mullard ECC83 - (code backward3)91 means made in Chelmsford for Mullard by Marconi, but not sure how to date the rest = £50 Mullard ECC81 - no code that I can see = £25 Phillips JAN (US military grade) 12AX7WA - in box dated 1986 = £25 Caveat Emptor: I have tested them in my Demeter amp and they are all working fine at time of writing, but as always with old valves be aware they can fail at any time. Please do bear that in mind before you buy. Edited May 16 by franzbassist 1 Quote Link to comment Share on other sites More sharing options...
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