So I have decided it's time to join the beautiful world of the head and cab. I have a GK 4x10 cabinet which I've had for quite a while now but have always used it combined with my peavey combo amp. All I need is an amp head but I wanted some input from the bass community. I know of tubes and solid state and would prefer a tube but they're pricey and my wallet can only hold about $400 so if anyone has some suggestions or tips on what to look for, it would be much appreciated if you shared your knowledge. I'd be playing through it with a Fender Geddy Lee Jazz bass.