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This is really in mint cosmetic condition. Looks barely used, which always makes me suspect it was lost in a warehouse, at the back of a music store or in someone's closet for most of its life. Did not work when I found it, which also means it could have been flawed from the factory. The two most important capacitors in there were badly faded - the 100uf power filtering cap and the more important 47uf effect chip biasing cap. The biasing caps in these old Boss pedals are rated at just 6.3v so are much more prone to failure, which wreaks havoc on modulation effects. After replacing those, it still didn't work. Turned out to be that RC3403ADB long chip, which drives the effect and LFO These are quad opamps, but are also "ground sensing" which, apparently, means they do an improved job or regulating voltage (not an expert here). Anyway, this had failed. Fortunately, I have a nice lot of NOS 1980 chips, same make and model. Popped that in (using a socket) and the effect came back to life. This is a sweet little filter - very warm and pick attack responsive. Has the two basic controls for setting the parameters for your particular setup, and an Up and Down toggle. If you want to hear a dramatic use of a filter (not this one) with the down control on, listen to U2's "She Moves in Mysterious Ways." Finally, I did the 9v mod - correctly flowing voltage is everything in an effect like this.This is the older version with the clear switch, 4-digit stamped production number, washers on the base-plate screws, cardboard insulation and the black painted bottom plate, among other things. Be advised it also has the ever popular momentary LED - doesn't stay on when the effect is on. Works perfectly, sounds great and is in minty fresh condition.
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