Re: [motm] I've got a tube up my a**
2000-10-31 by Paul Schreiber
I got a tube amp/overdrive BUILT AND TESTED! But the 250VDC power supply had "lawsuit" written all over it! :) Paul S. ----- Original Message ----- From: "J. Larry Hendry" <jlarryh@...> To: <motm@egroups.com> Sent: Monday, October 30, 2000 10:27 PM Subject: [motm] I've got a tube up my a** > WARNING: DIY content > > I've got a another DIY for MOTM project up my sleeve. My present and future > DIY stuff is something that I never expect Paul to even THINK about > releasing. I mentioned the "T" word to him once and he said, some comment > like, " no stinkin' tubes in my motm." That is not an exact quote. > However, it was sufficient for me to conclude that hell would freeze over > just before the release of the first motm tube module. > > I like tubes for certain things. I don't think they make a very good synth. > If you do, go pay mega-bucks for one of them "all-tube synths" and tell me I > am wrong. But, I do like what happens to audio signals that are pushed out > past the linear portions of the tube's characteristic curves. I like this > gentle distortion and interesting harmonics that start to show up much > better than the "cheap distortion" that is acheived by operating the plates > at very low voltages (aka PAiA tubehead). > > So, I have decided to start breadboarding and playing with a tube overdrive > circuit. I was planning something simple, but would love to hear from any > MOTM'ers that are into DIY and like tube stuff. What I was planning was to > use some common dual triode like a 12AU7. The audio would run through both > triodes. The module I was planning would have 3 or so inputs that mix > together (just a convienence feature). There would be two outputs. One I > would call "warm" and the other "drive." The warm output would have passed > through only one triode without any overdrive. The second output would come > after the signal passes through both triodes with the second one providing a > significant amount of variable overdrive. > > Of course, the inputs and outputs would be buffered to interface with normal > signal levels. The only control would be a "drive" control to provide for > the amount of overdrive. I was thinking about separate selector switches on > the input and output to select between "line" or 10v p-p" levels. > > Anyhow, right now, this is just a concept. But, back in my school days, I > did a lot of work with tubes and think I can make something like this work. > Obviously, a separate power supply would also be required for the higher > voltages needed for decent tube operation. > > So, I would appreciate any ideas and suggestions off list from any DIY'ers > think thingk something like this would be cool. > > Stooge Larry > > Disclaimer: I am not an engineer. I claim no expertise in circuit design.
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> I have nothing to sell. > > > > > >