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2 X 12AU7A / ECC82 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: NATIONAL. 1960s TESLA PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
93/108% EMISSION (EM) 100/104% TRANSCONDUCTANCE (GM) 0.2/0.2mA/V GAS
99/104% EMISSION (EM) 104/104% TRANSCONDUCTANCE (GM) 0.2/0.0mA/V GAS
