Is this a good preamp. Do I need some tweaks to make it work better. Btw this are the exact parameters I need so if any tweaking is required id prefer to keep the input output values as they are. Well the output should be 900mv max but it doesnt really matter when its +/- 10% ;) if someone knows a better circuit please tell,show etc. The transistor is low noise bc179 or bc177 and as for the power supply I presume a pretty well regulated one should be used to minimize distortions. Perhaps a lm7812 would suffice.