The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Text excerpt from page 6 (click to view)
ELECTRICAL ADJUSTMENT
PRACTICAL SERVICE FIGURE
< FM SECTION >
Sensitivity: (THD 3%) Distortion: Intermediate frequency: Less than 18dB (at 88/98/108MHz) Less than 2% (at 75kHz) 10.7MHz
< AM SECTION >
Sensitivity: (S/N 10dB) Distortion: (100dB 60%) Intermediate frequency: Less than 52dB (at 600kHz) Less than 50dB (at 1000/1400kHz) Less than 3% (at 1000kHz) 455kHz