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1 X EL34 TUBE. USED.
BRAND: MULLARD. 1960s PRODUCTION. B4K4 DATE CODES.
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN ROEHRENTEST TUBE TESTER:
61% 61.18mA EMISSION (EM) 10.63mA/V TRANSCONDUCTANCE (GM)
CH168U1