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The HBP-1J with Jensen Transformer from Demeter is a hand-wired preamp specifically designed for bass guitar that provides both tube and solid-state tones. It features a high voltage (250V) tube front end with preamp gain and passive tone controls, a two-band solid-state parametric equalizer tuned for bass, and an active effects loop with send and return level controls. In addition, there is a balanced XLR output switchable for a mic or line level signal to connect to a mixer/recording console or a power amp with an XLR input, as well as both balanced and unbalanced 1/4" TRS line level outputs for connection to an amplifier. A dedicated tuner output and a mute switch allow you to tune up silently.
Balanced and Unbalanced Outputs
A fully balanced XLR line output is provided to feed the audio signal from your bass to an external mixing console
Active and Passive Inputs
Separate inputs are provided to connect active and passive instruments
Tube Front End
The HBP-1 uses a 12AX7a tube on the front end for gain and passive tone controls
Adjustable Effects Loop
External effects can be connected through the active effects loop. Send and return level controls are provided on the front panel
In the Box
Demeter HBP-1J H Series Tube Bass Preamplifier with Jensen Transformer
Limited 1-Year Warranty
Table of Contents
1/4" Active Instrument x1 1/4" Passive Instrument x1 1/4" FX Return x1 IEC Power Cable x1
1/4" Tuner x1 1/4" FX Send x1 1/4" Unbalanced Line Out x1 XLR Balanced Line Out x1
Front Panel: Volume Control x1 Treble Control x1 Middle Control x1 Bass Control x1 Presence Control x1 EQ In/Out Switch x1 EQ Low Frequency dB Level Control x1 EQ Low Frequency Hz Control x1 EQ Low Frequency Width Control x1 EQ Mid Frequency dB Level Control x1 EQ Mid Frequency Hz Control x1 EQ Mid Frequency Width Control x1 FX Loop In/Out Switch x1 FX Send Level Control x1 FX Return Level Control x1 Mute On/Off Switch x1 Power On/Off Switch x1
Rear Panel: Line Level/Mic Level Switch x1 Ground Lift Switch Voltage Selector Switch
Minimum Load Impedance
+24 dBV @ 600 ohms + 28 dB
Adjustable to +10 dB Mid 440 Hz to 4 kHz EQ Gain: +/-15 dB
Signal to Noise Ratio
10 Hz to 40 kHz
Q or width continuously variable Low 40 to 440 Hz Mid 440 Hz to 4.4 kHz