Quote:
Originally Posted by Dj_AmTraX
I like the 845 tube paired with a solid state preamp. I don't understand the feedback knob so I don't touch it. Do you understand it?
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I hadn't used it myself until just recently. It's there in case you need it (for your speakers). It would raise the damping factor which could be a good thing if your bass is a little mushy. You can't mess anything up so give it a try. Rotate it clockwise, you'll hear a click, then it's variable from a couple db to 10 db. I find the more you dial in, less of the "magic" comes thru. Try about 5 db (the noon position) and see how your system sounds. If not better, just rotate it back and click it off. If you can get away without any, just leave it off.
In my case with the Maggies, I love this amp with a lot of music but when I listened to other music that was more dynamic, it would get a little fuzzy. That's when I tried the feedback for the first time. With the Maggies, it's a good thing. I don't lose much of that beautiful midrange but I gain a lot in the ability to start and stop that huge 4 ohm panel.
One other tip. The manual calls for the bias for the 300b to be 60 mA. That's a good mid point for the 300b. I found 52 to 57 sounds better in my system. If you like the lower bias your tube will last longer but 60 isn't running it hard. Let your ears guide you.