+1 to what @larryi wrote, quote:
"@larryi ...They had the kind of sound I associate with inadequate output transformers.
I am not saying that they are horrible amps; they are decent for the money, but, for my taste, they are not the "giant killers" that many claim them to be. Good tube amps are not cheap because the good parts, particularly transformers, are not cheap".
Worth noting while ensuring the speakers are a good match. For years it took me a while to realize and understand again why my 50-year local retired radio-audio tech kept telling me over and over - to ensure there are "very high quality and rightsized transformers in your next amps".