Hard-to-find Aguilar DB 659 for sale! I need the bucks, so I'll take $475 for it! This preamp is in perfect working order, and excellent cosmetic shape. There are minor scrapes around the mounting holes and a couple of small scratches areas on the bottom from rack mounting. Other than that, everything looks great. The DB 659 is the Aguilar sound in one rack space. Using two 12AX7s, the DB 659 packs the punch of a heavyweight in the frame of a flyweight. Descended from the acclaimed DB 680, the DB 659 shares much of the sonic signature in a user-friendly, diminutive package. The DB 659 is equally comfortable on stage or in the studio, providing lush bass sounds with minimal tweaking. Active/Passive inputs: One active and one passive input, for matching with the output gain of your bass. Controls the input gain to the preamp. Deep Switch: The deep switch adds 3db of broad band boost at 30 Hz. This is the instant fatness switch that makes bass sound warm and full. Equalization: Treble: Tube driven shelving type, boosts/cuts up to 12 db. The center frequency is set at 4k Hz. Bass:Tube driven shelving type, boosts/cuts up to 12 db. The center frequency is set at 40 Hz. Midrange:Tube driven shelving centered at 400 Hz. This pot is very smooth and useful for scooping the mids for funk, or adding mids that are clear and musical. Bright Switch: This switch is a passive RC pre-emphasis circuit @ 5-7 kHz. The bright switch will add a brighter timbre to the entire range of your bass. Effects Loop: The Send pot is push/pull for line or instrument level. This allows you to use a studio efx unit (line level) or a stomp box (requires instrument level) in the efx loop. The parallel/series pot is push/pull for parallel or series option. Master Output Control: This pot controls the output level to your power amp. Noise: > -80 db (unweighted) Fuses: One external 1/4 amp slo-blo for 100-120 volt operation, or one 1/8 amp slo-blo for 220-240 VAC operation. Preamp tubes: Two 12AX7s. Power supply: Regulated high voltage plate supply, regulated filament supply for lowest noise. Outputs: Two unbalanced 1/4 outputs, one XLR balanced output with Jensen transformer. Inputs: One active input -39K ohm, one passive input -1meg ohm. EFX Send: Variable send level. EFX Return: One return with -20 db to 0 db compatibility. Weight: 6 lbs. Chassis: Aluminum construction provides sturdiness without excessive weight.