modules with different tubes?

[harry]

The BlueBox is an elegent design... far more sophisticated than it looks.
I did a spice sim of it... and it worked like shit !  I had designed the model
to be simplified... using a bipolar supply and eliminating the bias components.

So I did an exact copy and that worked. There is interaction between stages
via the bias supply. Lucky Accident... or Careful Planning ???  This made it
work much better.

As you know I've got a system running using the Gold patent / New England Digital.

It excells in not skipping octaves. Where it "should" skip the octave, it reverses
phase
of the square wave instead. MUCH less annoying than the octave jump.

The BlueBox works "ok" IMHO. I agree about the neck pickup... and the roll off.
But
I also find it works best when you get from about the 5th to 12th fret. I believe
this is
a combination of pickup position, and what harmonics are lost at that position.
The
best might be to use a pickup such as the Fishman or similar... mounted in the
bridge
saddles... with HUGE gain and rolloff....

H^) harry


Scott Gravenhorst wrote:

> IMHO, FWIW and YMMV: I've used a BlueBox and it's been pretty good
> to me.  *However*, I found that setting up the guitar for it helps.
> None of these circuits like to have a whole lot of harmonics,
> so I set it to use only the bridge pickup and turn the tone control
> all the way to bass.  It's ok for me because when I use the bluebox
> I usually use just the box's sound.  I have a feeling that you've
> already tried and passed on the bluebox...  I've thought of modifying
> mine with a switch so that I can get either 1 or 2 octaves down
> instead of only 2.  Or a panpot would be cool too.  I suppose if I
> wanted to mix the guitar with the box, I could build a simple pre
> EQ box to go between the guitar and the bluebox.  I have the bluebox
> schemo here, I believe it's on the web somewhere.
>
> harry <harrybissell at prodigy.net> wrote:
> >If ANYONE gets a really good octave divider for guitar, tube or otherwise,
> >LET ME KNOW !!!
> >
> >I'll build it even if it is TUBES....  ;^)
> >
> >(of course I doubt anyone will ....)
> >
> >H^) harry
> >
> >The Peasant wrote:
> >
> >> Hello, all,
> >> >
> >> > >One would think that the 6X8 might make a good octave divider
> >> > for guitar.  Do
> >> > >you know if anyone has tried it?
> >>
> >> I've been working with tube flip-flops as part of my tube ADSR design
> >> project (coming along nicely, BTW), and IMO a tube octave divider would not
> >> be at all difficult to implement. If I get a chance I can even post some
> >> flip-flop designs to my web site if anyone is interested.
> >>
> >> Take care,
> >> Doug.
> >> ______________________
> >> The Electronic Peasant
> >>
> >> www.electronicpeasant.com
> >
>
> -- Scott Gravenhorst : Done the Edge, Now What?
> -- Linux Rex, Linux Vobiscum  |  RedWebMail by RedStarWare
> -- FatMan: www.teklab.com/~chordman
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