Well I dropped the action to 5/32" (4mm) and 9/64" (3.6mm) and the GC-10 plays better than I have ever known! I'd say that ease of playing has increased by around 30%. The voice is still robust enough for very good dynamics and tone colour has improved. I can also shape the tone and character of notes with less effort. Not bad! I now notice a slight decrease in the bass power, but this is comparing the Augustine Blue basses to the D'Addario EJ44C basses. This is I think due to the lower average tension of the bass strings: Augustine - 16.28 lbs. versus D'Addario - 17.33 lbs. There are no problems with buzzing so I haven't gone too low.
Now on to intonation which still needs to be adjusted. I suspect I will need to move the front edge of the saddle slightly back, mostly under the bass strings. Yamaha's later concert models (GC70/70C & 71, GC82S/C) all appear to have a slightly angled saddle which is further back on the bass side...so this makes sense as my saddle is parallel to the bridge.
Any suggestions on how best to accomplish the adjustment...trial and error?
Last edited by Beowulf on Fri Mar 03, 2017 2:28 am, edited 1 time in total.
1971 Yamaha GC-10 (Hideyuki Ezaki)
2017 Yamaha GC82S (Akio Naniki/Naohiro Kawashima)