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1 X 12AU7 TUBE. NEW OLD STOCK IN ORIGNAL BOX.
BRAND: GENERAL ELECTRIC. 1950s PRODUCTION.
GREY PLATES, D-GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
77/99% EMISSION (EM) 90/100% TRANSCONDUCTANCE (GM) 0.6/0.6mA/V GAS