Tube Amps Watts vs SS amp


Can someone explain is there is a difference between the watts of a tube amp vs vSS amp, Looking to get a tube amp ,but i see that the watts are much less than the SS amps, So how do these Tubes amps with 25 -70 - wpc drive these high end speakers, I have a vintage pair of AR 9s and 2 mcintosh MC2200 amps in mono (400 WPC) to drive these ,what tube amp will power these under 3-4k new or used, Thanks 
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Showing 1 response by audioman58

With tube amps it is not all about the advertised wpc, the transformers ,power supplies are the key and the quality .
i have seen a 18 watt parallel SET amp with great monolith transformers destroy a very respectable 100 watt SS amp 
by having big high headroom transformers  that makes all the 
difference in the world.