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Pioneer M-90 Right Channel Problems

I tried with ksa/ksc 3503/1381 and amp won’t click anymore. Triple checked orientation and all that but nothing. Only replaced a pair to start with so i know everything else is ok…
Maybe this semion trannies are not that suitable
 
My M90a now works great, it was hard work but very passionate. Here I learned a lot, thanks to all of you. KSA1381E and KSC3503D are not the right choice, they are very slow transistors especially the KSC with letter D. I used Toshiba's TTA004B and TTC004B. They are very fast and reliable pre drivers. KSA1013Y and KSC2383Y are also great pre drivers, but they have a very high COB and that's not good. Ask, I'll be happy to help you.
 
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