I've never used the valve heads but some say they are the holy grail of bass heads. I had an Ampeg solid state 450w head (SVT 3-pro? can't remember). I was immensly underwhelmed by it in a live situation. It really didn't seem that loud and the tone was pretty average.
I have owned Peavey in the past and also used a number of different stacks and you can't beat them for bang-for-buck. I thought the 700w Fire??? head they made was pretty potent.
There are many, many bad reviews of the SVT valve head having reliability issues. I would never own a valve head as I would be worried about the roadworthiness. And I would never own an Ampeg after my experiences.
Ultimately you need to follow your ears. Good luck!
Firebass 700. I just re-acquired one. They have a consistent track record of reliability and a very favorable dollars-to-watts ratio, especially now. I'm satisfied with the sound and performance.
If necessary I will trade a little tone for reliability and cost-effectiveness. No one hears your tone when your amp is broken or your power gets shut off because you didn't pay the bill.


