Guys newer to recording. Looking for a decent tube pre amp for guitar and bass. I have the presonus blue tube. It doesn't seem to do much. I'm recording a variety or distorted tones. From a old marshall jmp to a laboga mr. hector. I've been looking at pre amps. There's a million different kinds out there. What's the best bang for my buck? I'm using presonus interfaces. Looking to send under 300 bux.