I've added a album to the photo section of this blog entitled M15 HARD SYNC. It shows the location of R28 on both the Rev 1 and Rev flavors of the Model 15. To do this, either remove R28 altogether and replace it with a 10K, or bridge a 12 K over the existing 56K. The good news, based on where R28 is located onthe rev 2 you don't have to open it up to do this (thank god). - P
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Increasing Sync on Model 15 VCOs
2008-02-28 by (i think you can figure that out)