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4 X ECL82 / 6BM8 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: NATIONAL. 1960s TUNGSRAM PRODUCTION.
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN ROEHRENTEST TUBE TESTER:
113/69% 3.957/24.319mA EMISSION (EM) 2.59/4.12mA/V TRANSCONDUCTANCE (GM)
99/126% 3.455/44.03mA EMISSION (EM) 2.58/6.5mA/V TRANSCONDUCTANCE (GM)
103/126% 3.62/44.18mA EMISSION (EM) 2.53/6.88mA/V TRANSCONDUCTANCE (GM)
104/96% 3.657/33.75mA EMISSION (EM) 2.6/5.88mA/V TRANSCONDUCTANCE (GM)