10DC-1 dual diode COMMON CATHODE by International Rectifier. Package: Unique 3-pin Plastic and BLACK coloured resin tombstone block. Please note these items although clearly marked IR were originally sold by National Panasonic and used as a basic rectifier in audio equipment paired with the common anode version. Can also be found in Sansui and Yamaha audio amps of the same era. Status: NOS (New Old Stock) Tested components: YES RoHS compliant : no *** note: (Black resin back indicates common cathode - these ones ! ) *** *** note : (RED resin back indicated common Anode - NOT these ones ! - see 10DC-1R) ***