TAKE THE TUBE WORLD SURVEY!
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What is your favorite sounding USA/Canadian 12AX7/12AX7A of all time?
12AX7 RCA Black Plates 1950's
12AX7 Tungsol 1950's-1960's
12AX7 Sylvania black plates 1950's
12AX7 GE ribbed plates 1953-1963
7729=12AX7 Raytheon early 1960's
12AX7 Raytheon black plates
12AX7A RCA 1960's - 1970's
12AX7 Westinghouse and RCA Canada
12AX7 Marconi Radiotron Canada
12AX7A Sylvania
12AX7A GE
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Be sure to vote for your favorite European 12AX7, too.