Single pickup preamp with a variable Q filter. Filter has a stacked pot with Q level on the top and frequency on the bottom. A push-pull volume control engages an FT "pick attack" to bring sparkle back to low filter settings.
Upper Filter Control: Variable Q (0-13dB) with center detent.
Lower Filter Control: Frequency (200-5300 Hz).
Treble boost: 1 to 13 dB (adjustable) @ 4700 Hz.
BP Buffer for passive and most active pickups.
Idle current: 1.4 mA