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 28 (click to view)
Audio (English) A TitleAdjustment
Equalizer Curve Fine Adjustment
You can adjust the center frequency and the Q factor (curve characteristics) of each currently selected curve band (EQ-LOW/MID/HIGH). Adjusted equalizer curve settings are memorized in �CUSTOM�.
Level (dB)
Q=2N Center frequency
Q=2W Frequency (Hz)
1. Press the AUDIO button for 2 or more seconds to select Equalizer Curve Fine Adjustment. 2. Press the AUDIO button to select the desired band for adjustment. 3. Select the desired frequency with the 2/3 buttons.
LOW: 40 + 80 + 100 + 160 (Hz) = = = MID: 200 + 500 + 1K + 2K (Hz) = = = HIGH: 3K + 8K + 10K + 12K (Hz) = = =
4. Select the desired Q factor with the 5/� buttons.
2N + 1N + 1W + 2W = = = Note:
� If you make adjustments when a curve other than �CUSTOM� is selected, the newly adjusted curve will replace the previous adjusted curve. Then a new curve with �CUSTOM� appears on the display while selecting the equalizer curve. (Refer to page 24.)