Tell me, how can i get kinda Iron Maiden sound, that its not dirty, almost clean and rings long time... if ya know what I mean... my english ain't so good... sorry...

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very little distortion, and lots of sustain.

meaning:

less gain on your distortion
fuck around with your amp and distortion settings so you can get the most sustain possible
and regualary changing strings.....new strings ring/sustain for longer

also good pickups give great sustain !!!