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2 X 5687 TUNG-SOL TUBE. 1950s PROD. BLACK PLATES D GETTER TUBE. MATCHED PAIR. NEW OLD STOCK IN ORIGINAL BOX.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
85/94% EMISSION (EM) 88/92% TRANSCONDUCTANCE (GM) 0.8/0.6mA/V GAS
72/85% EMISSION (EM) 61/88% TRANSCONDUCTANCE (GM) 0.4/0.4mA/V GAS