Tube Amps Watts vs SS amp

My understanding is that the concept of “bandwidth” is very important. Perhaps more important for tube amps than solid state. But I have a First Watt SIT-3 which is a low watt solid state amp. It apparently has some bandwidth to it because it drives my Magico A3s well. They have a sensitivity of 88dB, an impedance of 4 ohms and recommended minimum power of 50 watts. The SIT-3 drives them just as well as my Bryston 4B3, which has a lot more power. But what I would like to know from the group is: how is bandwidth measured? How do you calculate bandwidth? Thanks. 

I am driving 85 dB sensitivity speakers with 200 WPC of pure analogue tube power using 8 KT150s. I can drive these to 98dBA spl with little effort and NO clipping and more to go. It sounds better than the comparable powered SS amp that I replaced.


Rollin

It's most likely been already covered but a watt is a watt whether it is sand or glass. All other factors will influence how amps work in their installations but a Watt is the same no matter where it comes from.

It is the clipping that is important. Glass clips softly, sand hard.

May want to consider a solid state amplifier with a little more ‘meat on the bones’ to emulate (75% or so) tube sound but maintain the high damping factor and needed power. Consider used GamuT D200 or possibly older Clayton Audio amplifier. Both amps are built to last.