Tube Amp Noise with Klipsch Cornwall II

Magfan,
Adjusting a gain very often is a feature of amplifier without any kind of re-dedign. It's rather 'adding' to an existing functionality and making the unit less-depended on tube quality. Most-likely, if higher quality tubes are purchased at the more than half-price the amp worth, the noise may still be an issue.
Tube amps are flexible in general in terms of adjusting a gain and/or lowering input sensitivity. The pot you need to install instead of feedback resistor to figure out the value at which the noise dissapears. Adjusting bias may or maynot be necessary neither on small signal or power tubes.

Congrats on your new speakers...I used to own Chorus in the late 80's. Klipsch'r really great w/the right tube amp. The Rogue is decent & very ballsy but noisy & somewhat unrefined & not quite 20/20 vision if you know what I mean. I was once the proud owner of a new Cronus hot-rodded to the max by Rogue w/their choice NOS tubes & it was somewhat noisy even w/my 92dB speakers & the bleed thru on the speakers while using the headphone section drove my better half crazy late at nite. I think if you find something more refined & perhaps triode driven you'll be in heaven. I'd love to try something like an Almarro 318B w/Corns....good luck.

Just get some small signal tubes that are graded low noise(even if they are cheap ones), and see if that doesn't ameliorate the problem. If your sources are not tubed, chances are they are not generating any hiss.

Many thanks for all your suggestions - I am going to explore them over the next few days. Mark O'Brian has always been super friendly and helpful - but I was really interested in what my Audiogon community had to say about the amp/speaker combo. I am going to try some new tubes first. And recheck all connections. The Cronus is my first tube amp and I love it - though part of the fun of this hobby s exploring new frontiers of sound - which I am getting in spades from these Klipsch Cornwalls - the sonic leap forward is huge.

Get the Quicksilver Horn Mono amps. No noise, no fuss and they sound great on high efficiency speakers.