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2 X EL34 TUBE. USED.
BRAND: -. 1960s MULLARD PRODUCTION. B2I4 / B6B4 DATE CODES.
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN ROEHRENTEST TUBE TESTER:
98% 98.31mA EMISSION (EM) 11.87mA/V TRANSCONDUCTANCE (GM)
129% 129.21mA EMISSION (EM) 14.63mA/V TRANSCONDUCTANCE (GM)
CH168U1