I purchased a STK-0029 from their website. Their datasheet says it will work for a Pioneer SX-580.
I purchased 6 of them for $ 4.50. None of them worked. UTSource asked if I would be happy for a 50% refund. Why would I? Their Datasheet specifically says it will work for SX-580 even though the ones they sent were STK0029 (without the dashes). They claimed it would work and was the same. I also had to wait 3 weeks for the part since China based. I am trying to dispute the transaction with my bank since they did not help me. I will never purchase from them again. I also purchased some transistors from them in the past very cheap quality. thin legs that broke on the T-220 transistor. I have learned my lesson. By the way I purchased the same power packs on ebay and they worked fine. Terrible Fraudulent company with awful customer service. Stay away find another vendor!!!!