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2 X ECC81 SIEMENS TUBE. NEW OLD STOCK.
BRAND: SIEMENS. 1960s SIEMENS UND HALSKE PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
78/87% mA EMISSION (EM) 4.49/5.13 mA/V TRANSCONDUCTANCE (GM)
87/91% mA EMISSION (EM) 5.21/5.34 mA/V TRANSCONDUCTANCE (GM)