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Thanks for the reply! I found alternatives for the 2n6428 in the 2n5210 with hFE 200-600 and the 2n4401 with hFE 100-300. I'll try both...

Would anyone know if AC125 with hfe 120-130 would be a good alternative to the 2sd352 here? I am also finding it hard to find 2n6428...