Does'nt the question depend on output too? In simple terms, a 20+watt SET will give you more slam than an 8watt one. Tube choice is a factor too. Having had both, it is my impression that 845's are more even across the spectrum than 300B's say.
My Viva Solista, 22 watt 845 SET, really drives the 89db Acoustic Zen Adagios I use in a 20 by 20ft room. There is real, deep, tight base there. In fact, it sounds louder, with better grip, than a 180 watt SS amp I also use
My Viva Solista, 22 watt 845 SET, really drives the 89db Acoustic Zen Adagios I use in a 20 by 20ft room. There is real, deep, tight base there. In fact, it sounds louder, with better grip, than a 180 watt SS amp I also use