Lowering Tube power amp output

Even if you are able to remove tubes and reduce power, this will often impact the impedance, which may cause other issues.

Why are you looking to do this, and what do you want to accomplish?

Agree with contacting Rogue and getting a direct response/recommendation. This avoids any unintended or unforeseen problems.

Charles 

If you don't want or need that brute, sell it and buy a more modest amp. 

No other way to reduce heat generation other than remove some tubes but I don’t know if your amp supports that. Likely this won’t work because of bias circuits that depend on two tubes to compare. You need someone that understands the amp well.

I have an Ayon amp with 4 x 6c33c tubes and makes 400 watts of heat. cant use it in the summer. In the summer I use my Decware. I’ve got it to dialed in I may end up selling the Ayon rather than switching back in the winter.

Jerry