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1 X 12AU7A TUBE. USED.
BRAND: SYLVANIA. 1960s PRODUCTION.
17MM GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 6.5mA
8.6/8.5mA EMISSION (EM)
CH166U1