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1 X 6189 / 12AU7WA TUBE. USED.
BRAND: SYLVANIA. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, 3 MICA, COPPER RODS.
ONE THE SYSTEMS IS LOW, BUT ABOVE 60%
TESTED IN AMPLITREX AT1000 TUBE TESTER:
71/62% EMISSION (EM) 90/72% TRANSCONDUCTANCE (GM) 0.2/0.2mA/V GAS
CH165U1