Demeter HBP-1 Tube Bass Preamp Works and sounds great Excellent condition $350 Paypal shipped Fedex to the lower 48 US High voltage (250V) tube front end (providing all of the preamplifier gain and passive tone controls) Separate Active & Passive inputs 3 band classic Fender tone stack Switchable two band solid state fully parametric equalizer that is tuned for bass Fully adjustable active effects loop with controls up front Tuner output Mute switch Full balanced output with switchable mic or line level Both a balanced TRS line level output and an unbalanced line level output for amplifier connections hand-wired using the finest components and assembled in the U.S.A. Specifications Input impedance: > 1megohm Minimum load impedance: 600ohms Maximum output: + 24dBV @ 600ohms + 28dB Gain: Adjustable to + 10dB Mid 440Hz to 4KHz EQ gain : + or - 15dB Signal to noise ratio: - 80dB THD : .5% Frequency response : 10Hz to 40kHz Tube: 1-12AX7a selected Parametric EQ: Q or width continuously variable Low 40Hz to 440Hz Mid 440Hz to 4.4KHz Inputs: 1/4" (passive and active) Outputs: 3-pin balanced mic/line, TT, XLR & 1/4" Chassis: Single space rack Operating voltage: 115V/230V AC switchable Power supply: 250V fully regulated Filament: 12.6V fully regulated