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2 X 12SN7GTA TUBE. TUNG-SOL BRAND. PAIR. NEW OLD STOCK IN INDUSTRIAL BOX. 1960s PRODUCTION BLACK PLATES.
TESTED IN ROEHRENTEST TUBE TESTER:
81/150% mA EMISSION (EM) 7.28/13.49 mA/V TRANSCONDUCTANCE (GM)
93/190% mA EMISSION (EM) 8.41/17.08mA/V TRANSCONDUCTANCE (GM)