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2 X 12AT7 / ECC81 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: HALTRON. 1950s SIEMENS UND HALSKE PRODUCTION
GREY PLATES, HALO GETTER
TESTED IN AMPLITREX AT1000 TUBE TESTER 124/114% EMISSION (EM) 113/110% TRANSCONDUCTANCE (GM) 2.8/2.2mA/V GAS 98/92% EMISSION (EM) 98/98% TRANSCONDUCTANCE (GM) 2.0/1.2mA/V GAS