Tubes can make a hissing sound sometimes called tube rush. I have a tube preamp and when I put my ear up to my speakers with no music playing I can hear a steady hiss in one channel.
Tubes do have many fine characteristics but they can be noisy. Some can be dead quiet too. I'd swap some tubes if you have extras and see if it affects the noise.
You should be able to buy some very quiet tubes if that is your problem. Some sellers grade their tubes on how quiet they are. Phono stage grade being the most quiet.
Tubes do have many fine characteristics but they can be noisy. Some can be dead quiet too. I'd swap some tubes if you have extras and see if it affects the noise.
You should be able to buy some very quiet tubes if that is your problem. Some sellers grade their tubes on how quiet they are. Phono stage grade being the most quiet.