Abbingdon Music Research PH-77 Reference Class - Manual (Page 9)

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Section 2 - Component Overview
F1. STANDBY: to place the PH-77 in active or standby mode.
F2. SELECT: to select between the 3 different inputs or to select the different EQ curves (software configurable).
F3. MENU/OK: to operate the Menu system for setting cartridge parameters and other functions.
2.1 PH-77 Front Panel