Darkglass Microtubes 900 V2 Bass Head

900 Watt
1 Channel 
Analogue Preamp
B3K /VMT Mode Button
Studio-Grade Compression
Impulse Response Cabinet Emulation
MIDI Control
Compact Size
incl. Footswitch

Darkglass Microtubes B1K

CMOS Bass Overdrive
Level- and Drive Control
Clean / Overdrive Blend
Tone Control
MBoost Control
Grunt - Provides a low-end boost to massively thicken your sound when engaged
9V DC Adapter is NOT included! (with Center Negative Plug)

Darkglass Microtubes B3K V2 Bass Overdrive

With the Microtubes B3K v2 you get all the features of the original, with the ability to restore the mids for natural character. The attack switch has been replaced by the tone knob, giving much more control of the higher harmonic content (3 kHz to 8 kHz). The grunt switch is still present, as you would expect. The addition comes in the form of a mid boost, giving you a subtle 6dB boost from 300 Hz to 1 kHz to help you cut through a bit more.

Features

Blend: Mixes the clean input signal with the overdriven signal. The clean signal remains at unity gain while the volume of the overdriven signal is set by the Level knob, allowing for fine control of the blend ratio.
Tone: Controls the high frequency content of the sound. A variable low pass filter from 3kHz (ccw) to 8kHz (cw).
Level: Sets the volume of the overdriven signal.
Drive: Sets the amount of saturation in the overdriven signal.
Grunt: When engaged provides a massive low end boost to really thicken your sound.
Mid Boost: Gives a subtle 6dB boost from 300 Hz to 1kHz to help you cut through a bit more.
DIMENSIONS: 11.3×7.5 cm (4.45×2.95 in)

Darklass Microtubes X Multiband Bass Distortion

The Microtubes X series brings the studio method producers have been using the years to cover the whole bass distortion spectrum: from articulate high gain to punchy mild overdrive, raw and gnarly fuzz and everything in between. You now have absolute control in constructing your vision of what the perfect bass distortion texture, definition, and size should have.

Controls: High-pass frequency, Low-pass frequency, Level, Drive, Mix, Mids
power supply is not included!
(Only use a regulated 9V-18V DC adapter with a center-negative plug)

Demeter HBP-1J Bass Preamp

With Jensen Transformer Output
The HBP-1 H Series Tube Bass Preamplifier by James Demeter uses the same all tube front end found in his classic VTBP-201 Bass pre-amplifier and combines it with the revolutionary H Series circuitry found in his professional audio H Series line. This preamplifier provides the best of both the tube and solid state world. It features high voltage (250V) tube front end (providing all of the preamplifier gain and passive tone controls), a two band solid state fully parametric equalizer that is tuned for bass, a fully adjustable active effects loop with controls up front, a tuner output, a 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 and a mute switch. As with all Demeter equipment, it is meticulously hand-wired using the finest components and assembled in the U.S.A.

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

Demeter VTBP-201S Tube Bass Preamplifier

After over 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 hi-fi tube equipment. The VTBP-201S has the warmth and dynamic range that only tubes can produce, yet has lower noise specifications 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 amplifiers.

The VTBP-201S 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 VTBP-201S 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 preamplifier is carefully hand-wired using only the highest quality parts and tested at our factory in Templeton, California. 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.
Treble Control: The treble control gives 6dB of boost or cut at 4kHz (6dB per octave, shelving type).
Middle Control: The middle give 6dB of boost or cut at 500Hz (wide Q, peaking type).
Bass Control: The bass control gives 9dB of boost or cut at a selectable frequency of 60Hz or 120Hz (6dB per octave, shelving type).
Presence Control: The presence control gives up to 12dB of boost at a selectable frequency of 2kHz or 4kHz (active type, 6dB per octave).
Bright Switch: The bright switch gives up to 6dB per octave of boost from 2kHz.
Internal Volume Trimmer: This control is designed to match the output volume of the VTBP-201S with the input sensitivity of any power amplifier.
Studio Output: The VTBP-201S 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.

EBS Pedal Bass-IQ

analoges Envelope Filter

EBS Stanley Clarke Signature Acoustic Preamp

The Stanley Clarke Signature Acoustic Preamp is a 2-channel preamp, built exclusively with premium components. It is engineered and designed by EBS together with the legendary bass player and composer Stanley Clarke.

Features
2-channel analog preamp (A/B or A+B)
Operates with Studio-grade signal quality
10 Mohm Impedance inputs (both channels)
Individual High Pass/Notch Filter for each channel
XLR microphone-input with Phantom Power (channel B)
Electret pickup support (channel A) 
Tuner output
Effects Loop (serial/parallel)
Balanced Output (with Speaker Simulator and Ground Lift)
Aux Input and professional-grade headphones output.
Dimensions (WxDxH): max 168 x 124 x 53 mm
Weight: 660 g
Dedicated 9V DC Power Supply included

Electro Harmonix Bass Big Muff

Fuzz / Distortion / Sustainer
Tailor your drive/distortion sound with sustain, tone and volume knobs
A dry switch that mixes your dry bass with the Bass Big Muff Pi's distortion
A bass boost EQ switch that reintroduces your low frequencies when tone is set for high frequencies
Based on the Russian Big Muff
True bypass
Tough and compact die-cast chassis

bass preamp with Distortion, EQ, Compressor, DI