pioneer m-90

I`m currently working on a Pioneer m-90 which belongs to a friend. It was in need of a complete service and also from time to time the left channel makes cracking noises. Sometimes it works fine for an hour, sometimes the cracking noise appears right after startup. It's only for one or two...

Hey im new here first time. Living in the netherlands First of all very happy with my pioneer m90 with sonus faber consertos but to my issue here first of all i when i notice the protection/power protection power indicator wont lid this is my method of connection connected to Line direct ->...