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2 X 12SN7GT TUBE. TUNG-SOL BRAND. MATCHED PAIR. NEW OLD STOCK IN INDUSTRIAL BOX. 1940s PRODUCTION
TESTED IN ROEHRENTEST TUBE TESTER:
93/111% mA EMISSION (EM) 2,55/2,65 mA/V TRANSCONDUCTANCE (GM)
96/100% mA EMISSION (EM) 2,45/2,35 mA/V TRANSCONDUCTANCE (GM)