I just put together an AT95e cartridge with a Dual 1242 turntable. The Dual has a mono ,stereo selector on it. Will changing it to mono affect the play of a mono record, or would I need a mono stylus? I have the first Grateful Dead mono album that does not mention that it is ok to play with stereo equipment. Would I do any harm by playing it in stereo? Finally, when a reciever(Harman Kardon 330C) "pops" when you turn off the power how bad a sign is that? Good listening to you all.