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HelloI have a hum going through my system, it is even worse with my new, very efficient speakers, when I place a hum eliminator in between the power amp and pre amp the hum goes away, the only problem is I seem to loose some sound quality. My questions are, why would the hum go away with the hum eliminator and is there anything else I could do to achieve the same results, also has anyone used a particular brand of these gadgets that worked without lose of dynamicsRegards from Australia Roger
a) is this hum volume dependent (ie. does it get louder when you turn up the volume control on your preamp)? NO, CONSTANT HUMb) if you disconnect the IC between your pre and power amp, does the hum go away? VERY SLIGHT WITH EAR AGAINST SPEAKERc) if you have the pre connected to the power amp, does the hum go away if you take out the IC between source and pre? NO STILL THE SAMEd) what are the mains connections on your pre and power amps. By this I mean: - do they have 2-wire mains or a proper 3-wire (grounded) mains cord? 3 WIRE - if so, is there a connection between the earth pin (the central pin) of the IEC socket and the chassis? Or in the case of a captive mains cord, is the earth wire attached to the chassis? YES - if the component has a conventional PSU (with power transformer), is the centre tap of the mains transformer connected to the chassis? YESe) is any part of a component connected to the chassis ... eg. input RCA sockets? ... speaker return BPs? ... PSU earth? NOT SUREf) do you have your system components plugged into just 1 mains circuit or several? JUST ONEThanks for the reply Andy, hope this helps, I have valve pre (bottlehead) diy class a amp with sep power supply (altronics) pi 2 tower speakers Zhaulu dac
Thank you all for your replies, I will try to fix the problem by tying the audio signal of my bottlehead pre to its chassis/safety ground to see if that works, I will let you know how I get onRegards Roger