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2 X 5687 TUBE. NEW OLD STOCK IN INDUSTRIAL BOX.
BRAND: 1950s TUNG-SOL PRODUCTION.
D-GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
95/75% EMISSION (EM) 96/85% TRANSCONDUCTANCE (GM) 0.6/0.4mA/V GAS
86/81% EMISSION (EM) 88/85% TRANSCONDUCTANCE (GM) 0.6/0.4mA/V GAS