a (no longer) new, reissue EH Small Stone that I hacked
into in a
number of ways.
Now, let's see if I can remember. . .
There's a 4PDT switch that switches all four filter caps
in one fell
swoop (drilled into the "S" in the word "small"). The down
stock, 0.0068uF on all four stages. The up position is
(0.15u, 0.22u, 470p, 4n7, or something like that). I tried
different values, and went with what sounded good to me.
If you want
more info on this mod, you can do a search on Google or
check out this
web site: DIY
Analog Guitar and Bass Music Effects.
The bright switch switches the input cap to the phase
stages (C3 in the
issue J layout), between the stock 10uF and a 0.1uf. It
kind of takes
the edge off of the Small Stone's inherent "darkness."
I installed a SPDT, center off, toggle switch on the
outgoing end of
each of the four filter caps. The stock setting is with
switches in the up position, all four stages configured as
filters. Switching any of them to the down position
diverts the filter
cap to ground, converting that stage to a low pass filter.
This is the
PhaseFilter mod that Mark Hammer came up with, except that
I did it on
all four stages instead of just the last two. It's pretty
cool when you
have all different cap values ('Vibe values) in each
stage. For more
info, see http://hammer.ampage.org/.
The center position on each of these four toggle switches
the connection at the outgiong end of each filter cap.
turns off the particular filter stage. And, guess what? A
Small stone actually sounds kind of cool. It's neat to be
isolate each filter stage when the caps are switched to
Then, there's the mono/stereo switch. This actually does a
things. Primarily, it's a vibrato switch, breaking the
part of the
circuit that blends in the clean, unmodualted signal,
leaving only the
modultaed signal at the main output. The other thing that
does is sent the clean, unmodulated signal to the second
that I added, providing pseudo-stereo outputs. See the
check out the sound clips that I recorded in stereo. (Man,
hole in the middle of the PCB is whacked, ain't it?)
Finally, I replaced the goofy 1/8" power supply jack with
2.1mm barrel-type jack.