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2 X L63/B TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: MWT. 1950s PRODUCTION.
BLACK PLATES, INVERTED CUP GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
73% EMISSION (EM) 2.44mA/V TRANSCONDUCTANCE (GM)
68% EMISSION (EM) 2.63mA/V TRANSCONDUCTANCE (GM)