I've used DHA pedals, VTDI pedal, Orange Terror amp, Randy Jackson Markbass head and then an Ampeg PF500 etc all to get that near impossible wish of a lightweight, loud Ampeg valve head sound. Then in a moment of unusual personal clarity I thought 'what I really need to buy is a fudging valve amp!' D'oh!
I discovered/bought a PF50T shortly after that! Couldn't be happier.