Tube Amps / Music Electronics
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|previous: Rick Erickson Dave, ||View Thread|
|11/27/2000 8:38 PM|
|Steve A.||Re: Bedrock MV|
... one way sends the wiper to the power tubes, the other has the wiper connected to the output of the p/i, running the p/i's plates (through the coupling caps) toward ground. The latter method produces a good bit more distortion than the former.
I'd been wondering about that! Dan Torres' post-PI MV is wired up the second way while Bruce Collins always recommended the first way (not unlike a stereo volume control). Diff'rent strokes for diff'rent folks, I guess! If you are looking for a lot of distortion at lower settings from a vintage design then I guess you would want to go with Dan's design. (I believe that the Trainwreck Papers show the MV wired up the first way.)
P.S. I really hadn't noticed the problem with NFB either! Then again I usually use a large NFB resistor like 22k to 56k. Sometimes I think that KO'C is a bit too much into theory than reality... FWIW some people who have tried out the amp designs in his books think that they are a bit on the buzzy side of things. "You have distortion... what ELSE do you want???" Well, good tone would be nice... Of course all of his suggestions do make good food for thought, which will presumably be digested and modified for one's own tastes, rather than just regurgitated whole... Speaking of which, I hope that everybody had a nice Thanksgiving dinner!
|Bruce First off the only reason to do thi... -- 11/27/2000 9:46 PM|