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2 X 6X4W TUBE. NEW OLD STOCK.
BRAND: TUNG-SOL. 1950s PRODUCTION.
BLACK PLATES, D-GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
96/100% 33.67/35.17mA EMISSION (EM)
142/139% 49.79/48.21mA EMISSION (EM)
CH166U1