I am using a rather smart little Denon SS amp 'pre only' to drive various
valve power amps - giving instant confirmation/reaffirmation of my
preference for valves every time I do it!

This entails using the amp's 'Pre Outs' and switching Speakers A and B
*both* off.

Could someone confirm that this, at least, *unlikely* to harm the amp when
used thus for long periods (all day long, when it's not as hot as today) -
I'm *certain* it doesn't harm the amp, but there's always that little tiny
doubt nagging away!

(I don't want to burst the casework open with a build-up of sound pressure!!
:-)