Midrange hiss....VERY slight...with my Dared pre


Let me start by saying that I've never owned a Tube preamp. I bought this piece 2nd hand, it has 'upgraded' tubes (installed by the previous owner, who seemed to know his stuff). The model is the SL-2000A. Anyway, after listening I noticed that there is a rather prominent hiss in the midrange. It sometimes is VERY unnoticable...but when the sound is playing in a certain range (perhaps around 2-5khz) the infromation is played with a slight hiss. Is this just what tubes do? Any help would be GREATLY appreciated.

Thanks.
radium141

Showing 1 response by dlstephenson

What type of tubes are in this unit now? Do you know how old the unit is or really how many hours the tubes have on them. What is the efficiency rating of your speakers and what brand? Single driver or multiple?