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1 X 4П1Л / 4P1L TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: TESLA. 1960s PRODUCTION
GREY PLATES, DUAL GALO GETTER, VERY RARE PROTOTYPE TUBE
TESTED IN ROEHRENTEST TUBE TESTER
94% 32.87mA EMISSION (EM) 5.13mA/V TRANSCONDUCTANCE (GM)