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1 X ECC81 / 12AT7 TUBE. USED.
BRAND: ADZAM. 1960s MULLARD PRODUCTION. B9K4 CODES.
GREY PLATES, HALO GETTER.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
72/102% EMISSION (EM) 80/98% TRANSCONDUCTANCE (GM) 0.2/0.4mA/V GAS
CH166U1