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1 X 5751 TUBE. NEW OLD STOCK.
BRAND: DUMONT. 1950s .
BLACK PLATES, D-GETTER, 3 MICA, COPPER RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
80/110% EMISSION (EM) 75/83% TRANSCONDUCTANCE (GM) 0.0/0.0mA/V GAS