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2 X ECC81 VALVO TUBE. NEW OLD STOCK.
BRAND: VALVO. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
91/84% mA EMISSION (EM) 6.06/5.7mA/V TRANSCONDUCTANCE (GM)
89/86% mA EMISSION (EM) 6.01/5.5mA/V TRANSCONDUCTANCE (GM)