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2 X ECC81 TUBE. NEW OLD STOCK.
BRAND: SIEMENS. 1950s SIEMENS UND HALSKE PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
88/84% EMISSION (EM) 90/87% TRANSCONDUCTANCE (GM) 0.4/0.4mA GAS
78/92% EMISSION (EM) 80/87% TRANSCONDUCTANCE (GM) 0.2/0.4mA GAS