LHZ -01 Installation Instructions Manual
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LHZ -01 Installation Instructions Manual

Bass preamp
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INSTALLATION INSTRUCTIONS
LHZ-01 BASS PREAMP

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Summary of Contents for LHZ LHZ-01

  • Page 1 INSTALLATION INSTRUCTIONS LHZ-01 BASS PREAMP...
  • Page 2 (make sure it includes solder in the kit) from your local hardware store, and practice soldering wires together to get comfortable. Most people are ready to start working after less than 30 minutes of practice. LHZ-01 INSTALLATION INSTRUCTIONS 2 of 28...
  • Page 3 ABOUT THE LHZ-01 The LHZ-01 is a compact PCB (Printed Circuit Board) employing the same vintage HazLabs® preamp circuit design as used in the 80’s Spector® NS2 bass guitars. The preamp circuit is designed around the LF442CN JFET OpAmp. Unlike high-fidelity audio OpAmps used in modern equipment, the LF442CN is designed for instrumentation use, and was renowned for imparting unique harmonic overtones that helped shape the overall tone of the NS2.

  • Page 4: Preparing For Installation

    The volume and blend potentiometers can vary from the standard (which is based on the potentiometers in the original HazLabs® preamps) significantly and will not impact the LHZ-01 operation. It is not uncommon for volume & blend potentiometer to range between 25k and 500k, as the values are specific for the type of pickups being used. (Consult pickup manufacturer for specifications.) These variations will not impact the performance or tonal characteristics of the preamp.
  • Page 5 BEFORE working on the bass. • Wire the Treble and Bass potentiometers to the VR4 and VR5 connection pads on the Top of the LHZ-01 board using approximately 4 to 5 inches of wire. •...
  • Page 6 Cut the power, pickup, and output jack wires. Make each cut in a location that BOTH: o Leaves enough wire to connect to the LHZ-01 preamp, and o Leaves enough wire on the original components to allow them to be re-attached in the future. (Just in case you ever want to re-install the original components.)
  • Page 7 Use cardboard or non-conductive foam strips to prevent the LHZ-01 from touching the wall. o Fold up a dollar bill and tuck it behind the LHZ-01 to act an insulator. (It works well and will surprise you in a few years when you open up the control cavity!) •...
  • Page 8 UNPLUG WHEN NOT BEING USED The LHZ-01 preamp requires very little current, so a typical 9-volt alkaline battery will last a year or more of normal use. The preamp is powered whenever a guitar cord is plugged in which enables power to the preamp circuit. This is a standard design used for almost all pre-amps.
  • Page 9 VOLUME An A/C audio taper potentiometer provides the most natural volume roll off across the entire range of the potentiometer. BASS/TREBLE The LHZ-01 uses a Bandaxall circuit designed for Linear taper potentiometers. LHZ-01 INSTALLATION INSTRUCTIONS 9 of 28 Revision 1.7e...
  • Page 10 POTENTIOMETER NOTES This diagram replaces the VOLUME and BLEND potentiometers with the modular Active Balance and Active Volume controls from EMG. In this mode, the LHZ-01 receives the output from the EMG This wiring completely bypasses the VR1 Blend and Volume control into two pins on the VR3 header, and acts as an active EQ.
  • Page 11 Be sure to use NON-CONDUCTIVE double-sided foam tape if you choose to adhere the LHZ-01 board to the grounded control cavity walls. LHZ-01 INSTALLATION INSTRUCTIONS 11 of 28 Revision 1.7e...
  • Page 12 The TW pickups are wired to the EMG controls, then the from the battery and routes it through two-wire output is connected to the LHZ preamp. the S and R pins of the output jack. The switched ground from the jack is used for all the GROUND connections on the LHZ.
  • Page 13 Transient sounds (fret slaps and aggressive picking) will have more volume, and less of the legacy only designed for 9 volts on an 18-volt preamp overtones. system will permanently damage your pickups! DO NOT SUPPLY MORE THAN 18 VOLTS TO THE LHZ-01 PREAMP. LHZ-01 INSTALLATION INSTRUCTIONS 13 of 28 Revision 1.7e...
  • Page 14 0% (very high resistance at 100k ohms) when going into the preamp. This is a non-traditional wiring method that works best with active pickups and an Audio taper on the Balance potentiometer. LHZ-01 INSTALLATION INSTRUCTIONS 14 of 28 Revision 1.7e...
  • Page 15 50k pots and adding a 50K resister to Pin 1 of each potentiometer. The keeps the total potentiometer resistance at 100k across pins 1 &3, which ensures the preamp EQ curves are not impacted. LHZ-01 INSTALLATION INSTRUCTIONS 15 of 28 Revision 1.7e...
  • Page 16 DON’T FORGET THE JUMPER! Since two independent volume pots are wired to the VR1 pads, a jumper is installed on the VR3 pad since a master volume pot is not connected. LHZ-01 INSTALLATION INSTRUCTIONS 16 of 28 Revision 1.7e...
  • Page 17 Care must be taken as the 6 pins on the B122 header are wired to different pins on the pot. The diagram below shows the internal wiring of the B122 board: B122rH LHZ-01 INSTALLATION INSTRUCTIONS 17 of 28 Revision 1.7e...
  • Page 18 VARIATION: SPECTOR® CONVERSION NOTES This variation shows how convert a stock Spector® two volume control so the same volume knobs are used with the LHZ-01. This diagram is messy, but is organized so that it is laid out in the same manner as the original Spector®...
  • Page 19 PAGE INTENTIONALLY LEFT BLANK (RESERVED FOR FUTURE CUSTOMER-SUGGESTED MODIFICATIONS) LHZ-01 INSTALLATION INSTRUCTIONS 19 of 28 Revision 1.7e...
  • Page 20 PAGE INTENTIONALLY LEFT BLANK (RESERVED FOR FUTURE CUSTOMER-SUGGESTED MODIFICATIONS) LHZ-01 INSTALLATION INSTRUCTIONS 20 of 28 Revision 1.7e...
  • Page 21 PAGE INTENTIONALLY LEFT BLANK (RESERVED FOR FUTURE CUSTOMER-SUGGESTED MODIFICATIONS) LHZ-01 INSTALLATION INSTRUCTIONS 21 of 28 Revision 1.7e...
  • Page 22 PAGE INTENTIONALLY LEFT BLANK (RESERVED FOR FUTURE CUSTOMER-SUGGESTED MODIFICATIONS) LHZ-01 INSTALLATION INSTRUCTIONS 22 of 28 Revision 1.7e...

  • Page 23: Common Configurations

    Traditional 3-conductor jacks will typically have three separate connectors in a different orientation as shown below: IMPORTANT: Note that the connection of the solder tabs are in a different order! Always identify which are the T, R, and S connections before use. LHZ-01 INSTALLATION INSTRUCTIONS 23 of 28 Revision 1.7e...
  • Page 24 100 k 1.2k 22n F 100 k 22n F 4.7uF 100 k SWITCHED GROUND (VIA TRS) TITLE: Bass Preamp LHZ-01 PCB Schematic REV: LRW Media Company: Sheet: BUFFER AMP U1.2 BASS CUT & BOOST TREBLE CUT & BOOST HIGH FREQUENCY BOOST...

  • Page 25: Wiring Notes

    WIRING NOTES Every LHZ-01 is 100% tested before being shipped to ensure the preamp is fully functional and ready for use. As with any electronic devices designed for custom wiring, there is opportunity for installation errors that can adversely impact the operation of the preamp, and in certain cases permanently damage the preamp, pickups, or other components.
  • Page 26 • Verify solder connections are good. • Make sure underside of LHZ-01 is insulated and not making direct contact with metal components or conductive cavity walls. LHZ-01 INSTALLATION INSTRUCTIONS 26 of 28 Revision 1.7e...

  • Page 27: Trademark Disclaimer

    If you have a problem installing or using the LHZ-01 by following the standard installation wiring diagrams, please feel free to email us with your questions. Due to the volume of mail, please allow at least 1 day for a reply.
  • Page 28 PAGE INTENTIONALLY LEFT BLANK LHZ-01 INSTALLATION INSTRUCTIONS 28 of 28 Revision 1.7e...

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