So when I turn on the amps only, not a sound. When I turn on the preamp, but keep it muted, I hear a hum in both speakers. It’s a hum with a slight buzz. When I unmute the preamp, I have a hiss over the hum. Is it the preamp or something before it in the chain?The tubes in the preamp are over 10 years old.
Hum from speakers
Hello all. I have a 10 year old EAR 890 amp. Recently, I've noticed a low hum or buzz coming from my speaker tweeters. I don't notice it when playing music, but it is annoying nevertheless. It wasn't there before. Only recent change is I had my dac, a Bricasti M1, upgraded by Bricasti to the new MDX board. Any ideas what is going on?