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He mentioned he had misplaced the paper they sent with the pickup explaining what parts to replace when he installed the new pickup. View the original note from Roland sent to Jonathan Prince. But Mark Wire was able to find a replacement hex divided pickup! 413100 Mark goes on to outline the resistors that need to be changed for the new #610 pickup.I emailed back that his memory was probably fooling him, as there was no official Roland documentation on the pickup change. "We don’t have any humbucking pickups for your G-808 (I physically went out to parts dept. And Mark notes the serial numbers of the new and old pickups: Old type: #601 Pick-Up 22380601 New type: #610 Pick-Up 22380610. As it turns out, these are exactly the modifications that I outline in the notes below.I also have to add this: I picked up some G-707 electronics pulled from a guitar some years ago, and I did find a G-707 circuit board wired to support the older, narrow pickup.
I was contacted by a G-303 player in the States and a G-808 player in Norway both using the first run, early "prerelease" version of the guitar electronics.
When switching from the 80 ohm (narrow) to 900 ohm (wide) pickup, there is a 10:1 increase in impedance, likewise, it is necessary to change the negative feedback loop resistor by a similar ratio, from 330K to 33K, and from 1 M to 100K.
Mark also mentions that the pick guard must be slightly enlarged to accommodate the wider pickup, but only on the G-202 and G-505, the only guitars with pickguards.
Mark lists the serial numbers of guitars that use the older style, #601 (or part number 22380601) divided pickups: G-202 before serial no. For the G-303, G-505 and G-808, each string needs two resistors changed, one effecting the synthesizer signal, and the other effecting the hex fuzz signal.
The G-202 has a different hex fuzz circuit, so only six resistors need to be changed.