yeah, i just started fiddling and switching the power on and off in between moves.
here are some pics as a reminder of what i'm looking at:http://www.fivefishstudios.com/forum/vi ... .php?t=392
i've been using the preamp with delight, but i've started to notice a little buzz at extremely high gain. those samples i pasted above are at full gain.
so i moved the trafo a bit, and the noise went down to -71dB (according to the continual reading on the RMS Buddy plugin i'm using). which is very good. but when i put the lid back on the case, a little buzz comes back and it goes up to -66dB...which is still pretty good. i just wish i could find out what's happening when i put the lid on...i suppose some wires are bending is some way. could the wires touching the underside of the lid be cause a problem? could i insulate the top of the lid with electrical tape or something like that?
either way, thanks! i've been enjoying my SC-1...just trying to make it even better since i've got nothing else to do tonight!
You know at max full gain, that's 72dB. In simple words, any little microscopic amount of noise you have, it will amplify it to 4,000X and that's the noise you hear.
You'd always have some little noise at the very max gain. (That's why most pres out in the market are limited to 54dB, or 60dB. or 66dB at most)
From 66db to 72dB, that's a doubling of amplification.
Try laying the wire flat/taped on the bottom case. Maybe the top cover isn't electrically grounded to the bottom case (i.e. paint acting as insulator?)
And lastly... you have a very small case, with a big transformer in it. It's going to be impossible to make it 100% noise free. But the numbers you're getting, if you say there were at 72dB gain, it's pretty good.