Ovation Adamas 1687-2 Guitar #60 Internal R&D Testing Document

This is an internal Ovation research and development document from 1976 detailing the construction specifications and acoustic testing of an Adamas model 1687-2 guitar with serial number 0060. The first page includes detailed build notes such as top angle, brace dimensions, bridge measurements, and deflection readings (RL, SN, K, FF columns), with entries dated between 10/19/76 and 11/2/76. The second page contains a frequency response graph measured by technician D. Johnson on 11-30-76, annotating key resonance peaks and a note that overall amplitude is probably too low by 2.5 dBa.