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2 X N77 TUBE. NEW OLD STOCK.
BRAND: MWT. 1950s PRODUCTION.
BLACK PLATES, SQUARE GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
83% 13.227mA EMISSION (EM) 2.25mA/V TRANSCONDUCTANCE (GM)
97% 15.514mA EMISSION (EM) 2.47mA/V TRANSCONDUCTANCE (GM)
CH168U1