Hi Sifus,

I just bought an used tube pre amp , namely Antique Sound Labs to partner with my SS dual mono power amp. I love the warm tube sound.

However, I find this tube amp ( about 10 years old ) is giving loud hum sound. On top of that, after 3 hours of testing, it started to produce some electricity current noise ( woo sound ) through speakers.

Since this is the first time I am using tube amp, I wonder it is a norm for tube amps. No problems with my other SS amps I am having.

I am using 2 12au 7 (EH ) new and 1 12ax 7 tube ( 66% ) used Sovtek tube.

Any comments from any sifus are much appreciated.

This post has been edited by SKY 1809: Jul 25 2008, 09:27 AM