The pre-amp is a circuit found on Rod Elliott's site. It is a fully discrete minimal parts gain module designed to drive his DOZ power amp. It runs off a nicely regulated power supply utilizing an AC power pack. Shows good specs but I cannot speak to the sound quality as yet since the unit isn't up yet. The boards are stuffed and that was not easy since I tried to use high quality parts and as such needed to drill out some of the traces on the board. But it looks nice and if I don't screw up the transformer again it might be running next week. I built it to drive the Gainclones. It has 3 outputs. Oh yeah; I changed it from AC power pack to transformer thinking that might sound better. I am noticing the Pi4's really like the GC's so this will be my system for awhile during the Groupbuild effort.
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