Pair 6H9C Vacuum tube 6SL7 Gray Plate Foil Getter Made in Russia Tested 100%
Since vacuum tubes were made 30 ?. This includes poor print, oxidized pins, faint discoloration, or poorly box. Tube 1 ( 62/60 GM ) Tube 2 ( 62/61 GM ). Tube : NOS. TESTED IN A HICKOK VT-7D/U. Tested on Amplitrex AT-1000 Balance on Autobias.