I don't know if this will help, but my first piece of stereo gear back in the 70's was a Sansui 3000A receiver. It would blow the fuse about every other time it was turned on. As I began to upgrade, I passed it to my dad. He contacted Sansui and they told him that they had developed a fix for that phenomenon which they sent to him at no charge. You might contact Sansui and ask whatever question you have. I have found that manufacturers can be surprisingly helpful.