I had an Egnater Tweaker head for about 3 months, it sounded ok, the stock tubes were absolutely terrible though. There was a problem with the fx-loop in mine, (which turned out to be bad pre-amp tubes) the egnater support was great, I e-mailed them and they re-embursed me for some new tubes (the tubes are warrantied for 90 days), but I ended up returning the amp anyway, I had some financial problems arise, and in the end the Tweaker didn't do it for me anyway.