Came across a schematic for this awhile ago as it seemed interesting. It’s supposed to be a fairly rare overdrive pedal fetching up to $500. Here’s some information I found about it:
The rare 1980s Bartolini tube-it
Distortion Overdrive pedal made in Livermore, California, USA. Makes any
amp sound like a Marshall. This may be the only pedal Bartolini ever
made. Three position switch for more or less overdrive — plus treble, bass,
sustain and output controls.
It was designed
to emulate the distortion characteristics of an early 80s Marshall
JCM-800. Probably made in the mid 80’s. Three way boost switch unloads tons of gain from mild to overkill. The
circuit is set in a giant block of epoxy so there are no clones or
schematics available.
Does anything from smooth, cleaner OD to straight up blistering,
sustaining lead tones. Has the three way boost for different tone
styles. Can do TS-9, Marshall, or its own thing all together. Controls
include bass, treble, sustain , and output.
Whip the
bottom off the tube-it and inside there’s a little trim pot for adjusting
the sound to be bit more, or less present. All models may not have this
option. The trim is a small plastic wheel (see photo in the Disqus section) similar to the color to the exterior paint job.
Some of the tube-its were said to be mercilessly treble boosted. The pedal can get
a sound like a healthy Tube Screamer in the first position. Now up the
boost one notch, to add a little more drive, and fullness.
Perfect for
lower output pickups. Need some grind? Just flip the boost switch to
position three. It’s at least double the increase in gain, as between
positions one and two. The circuit is now presenting significant
drive, and a fuller, slightly distorted tone. Let’s not forget the
absence of tone suckage when it’s not kicked in. A very fine, versatile
pedal.
The only thing I changed was make the high low switch 2 different switches so you can control each one independently.
