alright, here's my story. we're playing a gig, and after i little while, i'm getting a whole lot of static from ampeg svt3. massive loss of low end and sound in general. after checking multiple instrument chords, i find that: 1. most of our spare cables are duds. 2. something is wrong with either the input jack or the preamp in my amp. i finish the gig with my bass plugged into the back panel's "power amp in" jack. now let me tell you. my tone was awesome in this new configuration. i play a modulus quantum 4 with stock emg pickups and 18v emg preamp and my tone was soooo punchy and warm going through my 2 15" svt cabs. so here's my question. is it advisable to continue gigging in this manner? i love the tone but i'm afraid i might be pushing too much signal directly into my power amp. i've also been experimenting with my sansamp bass driver pedal. i've been plugging it into the same power amp in jack. it still sounds super good, except it seems to have just the right touch of grind. am i courting danger with this method as well? i imagine that if i just go ahead and get my amp fixed, it will sound much better than it did right before it went freaky. but that takes time and money, and everything sounds good for now. what do you all think?