MOTM

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.
> I have nothing to sell.
>
>
>
>
>
>