Guitar It is flat on classical guitars and slightly curved crosswise on acoustic and electric guitars. The curvature of the fretboard is measured by the fretboard radius, which is the radius of a hypothetical circle of which the fretboard's surface constitutes a segment. The smaller the fretboard radius, the more noticeably curved the fretboard is. Most modern guitars feature a 12" neck radius, while older guitars from the 1960s and 1970s usually feature a 6-8" neck radius. Pinching a string against a fret on fretboard effectively shortens the vibrating length of the string, producing a higher pitch. Fretboards are most commonly
Tenor guitar Freeman to have a better six string guitar sonority for rhythm guitar work than the normal tenor guitar with its very high A string. However, it was still tuned CGDA so that it could still be played by tenor banjoists. The Eddie Freeman Special was based on a six string model and it had a larger six string body and a six string scale length of 25.25 inches, rather than the tenor's smaller body and normal 23 inch scale length. The CGDA tuning used was re-entrant with the C and D tuned in the same octave and the G and