Tube Amp Noise with Klipsch Cornwall II

Your new speakers are significantly more sensitive than your old speakers, so you're going to hear more system noise as a result.

The first step is to systematically replace the tubes in the Rogue with new tubes tested for low noise. I suggest Vintage Tube Services or Upscale Audio as sources for tubes tested for low noise.

Start with the small signal tubes. The EH and Sovtek tubes can be improved upon, and you likely will hear the results without any effort.

The horns that Klipsch used are brutally efficient/bright, and any noise upstream(like the preamp section of the integrated) will be brought out without mercy. Replace the small signal tubes with "Platinum Graded" ones from Upscale Audio, ie: the choices here- (http://www.upscaleaudio.com/12AU7ECC82_c_44.html) and (http://www.upscaleaudio.com/b12AX7ECC835751b_c_40.html) If you click on the tubes, you will be presented with the various grades available. While you're at it; upgrade to some quality NOS tubes and you'll be rewarded with a much improved presentation.

The sensitivity of the Klipsch is going to drive you crazy with tubes. There will always be noise, how much will depend on the tubes. You may be in for a lot of 'tube rolling' before you are satisfied. Your search for a quiet amp may be endless.