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After 20 years of production the Demeter Amplification Tube Bass Preamplifier is still the only musical instrument preamplifier to incorporate truly modern tube design technology with circuit features found on only the most expensive and esoteric, tube hi-fi equipment. The Preamplifier has the warmth and dynamic range that only tubes can produce, yet has lower noise specs than most solid state devices. When the preamplifier is driving a quality power amplifier, it delivers the punch and clarity of the best tube amplifiers plus the almost unlimited power of today's modern power amps.
The Tube Bass Preamplifier uses a regulated B+ power supply which provides quick transient response with extremely low noise. Regulated DC is supplied to the tube filament which gives the unit extremely low noise. We use only the finest 1/2 watt, 1% metal film resistors, polypropylene capacitors, high quality, computer grade switches, and a 7025A vacuum tube, factory selected for lowest possible noise and distortion. The Preamplifier also has a low output impedance which lowers distortion and insures proper power amplifier input matching. Custom toriodal power transformer. New single space rack mount steel chassis.
Each preamp is carefully hand wired using only the highest quality parts and tested at our factory in Van Nuys, CA. You can see as well as hear the quality and attention to detail on both the inside and out.
Inputs
Two inputs are provided: Passive, for normal musical instrument inputs. Active, for high level active instruments. When both jacks are used the inputs are mixed equally.
Tone Controls
Treble: The treble control gives 6dB of boost or cut at 4 kHz (6 dB per octave, shelving type).
Middle: The middle give 6 dB of boost or cut at 500 Hz (wide Q, peaking type).
Bass: The bass control gives 9 dB of boost or cut at a selectable frequency of 60 or 120 Hz (6 dB per octave, shelving type).
Presence Control: The presence control gives up to 12 dB of boost at a selectable frequency of 2 kHz or 4kHz (active type, 6 dB per octave).
Bright Switch: The bright switch gives up to 6 dB per octave of boost from 2 kHz.
Internal Volume Trimmer: This control is designed to match the output volume of the Tube Bass Preamplifier with the input sensitivity of any power amplifier.
Studio Output: The Tube Bass Preamp features a Jensen DB-E output transformer for a balanced studio output.
Tuner Output: This output is unaffected by controls.
Mute Switch: Mutes the audio out.
Effects Loop: Has in/out switch and level controls.
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