Tube Watts Vs. Soild-State Watts?

The tube amp that I am looking at is about 80wpc single-ended class A. My current amp is solid-state 400wpc class AB. My speakers are Tekton Design Double Impacts. My previous experience with tube amps was mixed, as the amps had some characteristics I liked, but were not very dynamic. I like the sound of my solid-state amp, but am wondering if I could get more detail out of my music by going to a tube amp.

It's a transmitter tube amp, and the tube is the size of a coffee can. The solid-state amp I'm using certainly is dynamic with the Double Impact speakers. But, I feel like I'm not getting as much detail as I could be. I've upgraded everything else in the system, which just leaves the amp.

Yep, I went ahead and bought the NAT Transmitter amp. I'll have to go on Ebay and get some spare QB5/1750 tubes for it. NAT equipment looks very impressive, I hope the sound is as good. My solid-state amp was very dynamic, but somewhat lacking in detail. We'll see if the tube amp can fix that.

I finally got my transmitter amps and hooked them up to the Double Impact speakers. Glorious sound, very detailed yet rich. I was afraid that I would lose some bass coming from the large solid-state amp that I had before. That was not the case, bass was quite impressive and plenty loud.
Now the bad, after a few hours of use, the right channel suddenly dropped in volume to about half of what the left channel was playing. I replaced the input tube but that had no effect. Is this a tube problem, or something else?