Boulder 1008 Owner's Manual
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Boulder 1008 Owner's Manual

Boulder 1008 phono preamplifier owners manual
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Summary of Contents for Boulder 1008

  • Page 2: Owners Manual

    Boulder 1008 Phono Preamplifier Owners Manual V1.0 10/20/2009 Boulder Amplifiers, Inc. 3235 Prairie Ave. Boulder, CO 80301 www.boulderamp.com CARTRIDGE GETTING APPENDIX RECORDING EQUALIZATION OPERATION SET UP STARTED...

  • Page 4: Table Of Contents

    Placement of the 1008 Phono Preamplifier ........
  • Page 5 EQUALIZATION Equalization Curves ............4-1 RIAA Reproduce Curve .

  • Page 6: Getting Started

    Because the preamplifier is heavy, a solid, stable surface should be used. The 1008 will generate some heat, so it should be allowed to have good air circulation. You may want to have some access to the rear panels for cable changes.

  • Page 7: Connecting To The Mains Outlet

    Make certain that the “O” is pushed on the rocker switch before connecting to your mains. Your 1008 has been configured for the voltage suited to your loca- tion. Exact voltage and frequency specifications are located on the rear panel, right of the AC mains connector.

  • Page 8: Connecting To A Turntable

    One pair of Boulder PHRCA Adapters are provided. These will convert 1008 inputs to RCA and give acceptable performance. A sepa- rate ground wire is provided. However, obtaining a dedicated cable with a connector specifically for your tonearm and with 3-pin connec- tors is preferred.
  • Page 9 PHONO CABLES CARTRIDGE 1008 PHONO INPUT 2-POS INPUT 3-POS INPUT 1-POS INPUT TURNTABLE CHASSIS CHASSIS CARTRIDGE 1008 PHONO INPUT 2-POS INPUT 3-POS INPUT N.C. 1-POS INPUT TURNTABLE CHASSIS CHASSIS CARTRIDGE 1008 PHONO INPUT 2-POS INPUT 3-POS INPUT 1-POS INPUT TURNTABLE CHASSIS...

  • Page 10: Connecting To A Balanced Input Preamplifier

    For maximum sonic advantage, connect your 1008 Preamplifier’s balanced outputs to balanced inputs such as provided on all Boulder Preamplifiers. With the 1008’s low output impedance, distances of more than 50 meters between Phono Preamplifier and Line Preamplifier are practical. Connect each preamplifiers input to the connectors labeled “OUTPUT.”...

  • Page 11: Connecting To An Unbalanced Input Preamplifier

    CONNECTING TO AN UNBALANCED INPUT PREAMPLIFIER A special cable is required to make this connection. This cable con- nects pin 1 to the shield and pin 2 to the center pin. It leaves the out- put pin 3 unconnected. Connecting the unused output pin (usually pin 3) to ground will cause excessive ground currents and degrade performance.

  • Page 12: Cartridge Setup

    The 1008 is shipped with all 4 cards installed in the rear panel. The cards are set to MC, and have a load resistor installed to set the input impedance to 100Ω.

  • Page 13: Moving Coil Or Moving Magnet

    MOVING COIL OR MOVING MAGNET SELECTION Set the switch to either Moving Coil (MC) or Moving Magnet (MM) depending on your type of cartridge. In the MC position, the maximum input resistance is 1,000Ω with- out additional components installed on the card. All four of the cards are shipped with a resistor to bring the impedance down to 100Ω, which is recommended for MC.

  • Page 14: Cartridge Loading - Resistive

    CARTRIDGE LOADING – RESISTIVE For MC cartridges, the maximum resistive load is 1,000Ω. This is the value when there is no resistor added to the Personality Card. This value may be lowered by adding a resistor (as shown) at R1 whose value is calculated by the following: R1 = 1/(1/R –...

  • Page 15: Cartridge Loading - Capacitive

    CARTRIDGE LOADING – CAPACITIVE The 1008 Phono Preamplifier inputs have only “parasitic” capaci- tance of less than 50 pF directly across the cartridge inputs. If desired, additional capacitance can be added on the personality card at C1. The capacitor chosen should be 50 pF less than the desired value.

  • Page 16: Operation

    With all your connections made, you are ready to listen to your Boulder 1008 Phono Preamplifier. Push on the “I” of the rocker switch on the rear panel of the 1008. No indication on the front panel will be shown.

  • Page 17: Input Selection

    To enhance monaural recordings played with a stereo cartridge, it is often desired to mix the left and right channels together to form a true monaural signal. In the 1008 it is possible to do this by turning on MONO mode.

  • Page 18: Equalization

    RIAA. All three remaining curves may be selected by using the pushbutton labeled ALT EQ. Various alternate EQs are selected by repeatedly pushing “ALT EQ” until the desired LED is red. The 1008 will immediately mute the outputs and the MUTE light will be red for 3 seconds.

  • Page 19: Low Cut Filter

    LOW CUT FILTER The Boulder 1008 Phono Preamplifier uses a 3 pole (18 dB/octave) low cut filter which is -3db at 10 Hz. Because this filter is fairly steep, its effect is virtually negligible in the audio band. It is recommended that it be kept turned on in order to avoid excessive woofer travel caused by imperfect records.

  • Page 20: Mute

    First, the outputs are muted for 35 seconds when the 1008 is first turned on. The 1008 is also muted for 3 seconds when an input or equalization pushbutton is pressed. The MUTE indicator will be red.

  • Page 21: Equalization Curves

    The Boulder 1008 Phono Preamplifier uses one of four equalization curves selected by the front panel pushbuttons labeled RIAA and ALT EQ. The 1008 is shipped with four standard EQ options: RIAA, FFRR, EMI, and Colombia. The following pages show the four equalization curves. All graphs are referenced to 0 dB at 1 kHz.
  • Page 22 RIAA REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 23 FFRR REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 24 EMI REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 25 COLUMBIA REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...

  • Page 26: Using A Recorder

    USING A RECORDER CONNECTIONS A recording device may be connected to the Boulder 1008 Phono Preamplifier. You may use balanced or unbalanced connections for both input and outputs as previously described in the sections on connecting sources and power amplifiers.

  • Page 27: Appendix

    1008 AUDIO BLOCK DIAGRAM PHONO CARTRIDGE INPUTS LOW NOISE LOADING ON 26 dB GAIN PERSONALITY FOR MC CARD MM BYPASS RIAA FFRR PLAYBACK 10 HZ / 3-POLE BALANCED MAIN GAIN AND LOW CUT OUTPUT OUTPUTS EQUALIZATION FILTER BUFFER STEREO BYPASS...

  • Page 28: Specifications

    BOULDER 1008 PHONO PREAMPLIFIER SPECIFICATIONS Inputs 2 Balanced, Converts to Unbalanced Input Impedance, Maximum MC: 1000 Ω; MM: 47kΩ 1kHz Gain, RIAA MC: 70, MM: 44 Noise (EIN), MC 98 nanovolts Flat, 20 Hz to 20kHz Outputs 2 Balanced, use as Main or Record...

  • Page 29: Troubleshooting

    Check or install ground wire Duplicate ground connection Use only one ground wire to turntable or use the ground in a balanced cable 1008 or turntable is too close to another Move 1008 and/or turntable away components power supply from power supply APPENDIX...
  • Page 30 Tonality or frequency response is incorrect Wrong equalization setting is selected Press ALTERNATE EQ button to select proper EQ setting Will not come out of Mute 1008 has not been stabilized after turn-on Wait 35 seconds for 1008 to stabilize APPENDIX...

  • Page 31: Notes

    NOTES Serial Number ________ APPENDIX...

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