Used GT-500 F.E.T. Distortion + Boost/Overdrive Pedal in Very Good condition with Original Box.  

If you want this pedal, you can't get a new one from Fulltone because it's no longer in production.  So grab this nice used model while it's available.  

FROM FULLTONE:

Discrete F.E.T Hi-Gain Distortion and Overdrive Booster in ONE BOX. Think of them either as two separate pedals or as stages to be linked together for endless combinations. The Hi-Gain side has Volume and Distortion knobs with Bass, Mid, and Highs minipots. The Booster side has Volume and Overdrive knobs with Bass and Highs minipots. (These new Hi-Q sealed minipots don't break BTW.)

Hard clipped distortion (the way most pedals achieve distortion) at one point in a circuit can be cool, but stage after stage of FET (GT-500) is very real, very amp-like, has ridiculous amounts of sustain even at low volume, does the great chunky low string rhythm stuff and cleans up incredibly well when you turn down the guitar's volume. The GT500 contains 9 x FETs, 2 Mosfets and 1 x Transistor with no opamps or clipping diodes used.

The Hi-Gain side has a discrete Inductor-Driven Midrange circuit... never been done in a pedal before. Yes, there's a wah wah inductor inside the pedal that gives the Midrange control its ability to drastically increase or decrease the entire Low Mid, Mid, and Hi-Mid frequencies, to comical proportions. All this is done without any opamps because all of the active 3-Band EQs I've tried are horrible, killing all harmonics, all excitement, and sounding as sterile as the "EQ" in a Digital Recording Program. Nope, this has 100% discrete matched FET's ;)

This Mid control mixed with a strong Bass and Treble control help give the GT-500 the ability to dial in more variations than a simple tone control, which can only roll off the Highs.

The Series Select Switch allows you to choose which pedal comes first (allowing you to instantly change the order of the 2 circuits).   Booster --> Distortion ~OR~ Distortion --> Booster