Thanks for your replies. Yes, the transistors blew when volume was up too much and transforming from 220 to 110 volt might have have made the system less stable. Does a down-transform lower impedance so that too much current flows in the system at a given voltlevel - i am a listener and not an engineer? I live in Bangkok, Thailand so service is limited. Will check the transistor specs.
I also have an E100 amp from MF. Maybe it uses the same transistors as the E11 and I might be able to swithch - any knows about the E100 setup? Alos have an E61 CDplayer. The E11 surpasses both of them in sound quality.