STK0050+ for Pioneer SX-780 or Marantz SR4000; replaces STK0050/30/40
The STK0050+ fits these models and probably a lot more SX-780, SR4000, KR-5010, RS-2004A, JA-S44, JCX-2050. STK0050+.SX-780, SR4000, KR-5010, RS-2004A, JA-S44, JCX-2050. YES, every module tested in our Pioneer SX-780 or Marantz SR 4000.