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1 X ECC81 TUBE. USED.
BRAND: TELEFUNKEN. 1950s PHILIPS HEERLEN PRODUCTION.
GREY PLATES, D-GETTER, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
78/73% EMISSION (EM) 85/81% TRANSCONDUCTANCE (GM) 1.2/0.6mA/V GAS
CH168U1