Dating yamaha guitars by serial numbers

From looking at the version "A" photo, it appears the one op-amp is used per string to both amplify the signal and create the hex fuzz sound.If you look at IC6, at the top of the version "B" and "C" card, you can see resistors just to the left of the chip creating gain in the negative feedback loop, and additional diodes just to the right side of the chip for generating fuzz. After years of working with Roland vintage electronics, I finally noticed that there were two variations on the familiar hex pickup.Which made me wonder if the op-amp information in the original G-303/G-808 Service Manual Schematics refers to the very rare "version A" board.It is difficult to see in the photos, but on the standard cards, version "B" and "C", three op-amps, IC1, IC2 and IC3 are used to amplify the signals to line-level for the GR-300.If there is one guitar that has become the "gold standard" of guitar synthesizers, it has to be the Roland G-303 guitar.No doubt much of the popularity of the G-303 comes from Pat Metheny, who has played this guitar year after year on stages across the world, always amazing audiences with the moving and emotional quality of the G-303 and GR-300 rig.

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The G-202 has a different hex fuzz circuit, so only six resistors need to be changed.In addition, the standard 1/4” output jack solders directly to the PCB, rather than the ribbon connector.The first time I tried to repair a failed op-amp in a G-303, I realized that the pin-out documentation was wrong on the schematic.The pin out information was correct on the G-505 Service Manual Schematics schematic, which uses almost the same circuits.All the G-303s and G-808s that I have checked have op-amp pin outs consistent with the G-505.

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