Pioneer Sm-3000 blowing speaker

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I might be posting this in the wrong section, if so plz tell me. I recently was given a Pioneer SM-3000 amp. I have no experience with amps or audio equitment in general, so please bare with me. I attatched both speakers to A and did the same with the dial on the front. But when turning on the amp with no input coming in the left speaker smoked and is now blown. the right works completey fine. I have blown two speakers this way. I took the amp apart and did not see any noticeable damage. What could this be? The right speaker works as expected and plays music fine.
 
Hey, I left this project alone for awhile and wanted to get back on it. I have the amp apart and see the output transistors. Can someone explain how to test transistors once removed from circuit? Also, I hear there are lots of fake toshiba transistors so can someone give me a reliable source? They are toshiba 2SC1079 transistors. I am able to solder and desolder and and have replaced small parts on pcb in tvs and other computers. Also, do I need to replace capacitors? None are blown so I assume no, and I also want to do the minimal to get it working without breading it. Can I reuse the thermal tape on transistors? These might all be really simple questions but I'm new to this and am only 12. If you want I can send pics through email. If your reading could you please respond and give me some advice. Also, I also have working preamp for this set and a pioneer tuner of the same year. How is the sound qaulity and how much are these worth? Should I take them to a technician and spend the money to get it fixed or diy it? Thanks for all responses, I really appreciate it.
 
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