Can anybody who is familiar with the all tube Ampeg heads give me some help. The SVTCL head has an input gain control as well as a master volume.The amp has no input gain led so where to set the input gain is a bit of guess work. When i first got the amp i used to have the input gain on about 3/4 with the master volume at approx 4 for medium sized gigs. I play a musicman active bass, fingerstyle, and i connect it into the normal input. I have never used the -15db input on any of my amps as i play fairly lightly and my eq on the active bass is about flat so no major boost in signal. My eq settings on the head are, bass about 7, mid 8,mid pos control no. 4, treble about 8, the ultra low is out, ultra high is in. Where is the best place for the input gain, should i turn it down and turn up the master volume to work the power tubes more, or turn up the input and get the dirty Ampeg sound and turn the master volume down, or will it not really matter. I dont want to cook my preamp tubes by having too much input gain. Any help or ideas ??