Boulder 2008 Owner's Manual
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Boulder 2008 Owner's Manual

Isolated preamplifier
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Summary of Contents for Boulder 2008

  • Page 2: Owners Manual

    Boulder 2008 Isolated Preamplifier Owners Manual V1.1 5/21/02 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 2008 Phono Preamplifier ........
  • Page 5 Cartridge Demagnetization ..........3-5 Mute .

  • Page 6: Getting Started

    GETTING STARTED PLACEMENT OF THE 2008 PHONO PREAMPLIFIER Your Boulder 2008 Preamplifier is designed to reduce interference from external magnetic and radio fields (RF). While placement is not critical, known magnetic fields should be avoided. Power transformers in other pieces of nearby equipment, including the 2000 Power Supply should be kept away by 2 feet or more.

  • Page 7: Connecting The Power Supply To The Main Chassis

    CONNECTING THE POWER SUPPLY TO THE 2008 Your Boulder 2008 Phono Preamplifier is supplied with a Boulder 2000 Triple Power Supply. Each of the three supplies is independent of the others except for the front panel LED which confirms correct power supply operation of all three sup- plies.

  • Page 8: Connecting To The Mains Outlet

    CONNECTING TO THE MAINS OUTLET Your 2000 Power Supply is supplied with a mains cord suitable to the location where it was purchased. Make certain that the “O” is pushed on the rocker switch before connecting to your mains. One of the features of the 2000 is its universal automatic voltage- selecting power supply.

  • Page 9: Connecting To A Turntable

    One pair of Boulder PHRCA Adapters are provided. These will convert 2008 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 10 PHONO CABLES CARTRIDGE 2008 PHONO INPUT 2-POS INPUT 3-POS INPUT 1-POS INPUT TURNTABLE CHASSIS CHASSIS CARTRIDGE 2008 PHONO INPUT 2-POS INPUT 3-POS INPUT N.C. 1-POS INPUT TURNTABLE CHASSIS CHASSIS CARTRIDGE 2008 PHONO INPUT 2-POS INPUT 3-POS INPUT 1-POS INPUT TURNTABLE CHASSIS...

  • Page 11: Connecting To A Balanced Input Preamplifier

    For maximum sonic advantage, con- nect your 2008 Preamplifier’s balanced outputs to balanced inputs such as provid- ed on the Boulder 2010 Preamplifier. With the 2008’s low output impedance, dis- tances of more than 50 meters between Phono Preamplifier and Line Preamplifier are practical.

  • Page 12: 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 13: Connecting A Cartridge Demagnetizer

    RCA jacks for connecting your car- tridge demagnetizer. Connect each chan- nel of the demagnetizer to the left and right jacks labeled DEMAG. For further instructions, see page 2-2 and 3-5, or consult your Boulder dealer. RIGHT LEFT DEMAGNETIZER DEMAGNETIZER...

  • Page 14: Cartridge Setup

    The 2008 is shipped with all 6 cards installed in the rear panel and 4 additional spare cards.

  • Page 15: Moving Coil Or Moving Magnet

    MOVING COIL OR MOVING MAGNET SELECTION Set the bottom 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 1000Ω without additional components installed on the card. Two of the cards are shipped with a resistor to bring the impedance down to 100Ω, which is recommended for MC.

  • Page 16: Demagnetizer Selection

    DEMAGNETIZER SELECTION A DEMAG connector for your cartridge demagnetizer is provided on the rear panel. If you want to allow demagnetization of the car- tridge connected to a particular input, set the top switch to DEMAG OK. Otherwise, set it to NO DEMAG. Only the inputs which have the switch set to DEMAG OK will be connected to the DEMAG connector when the DEMAG indicator is red.

  • Page 17: Cartridge Loading - Resistive

    CARTRIDGE LOADING – RESISTIVE For MC cartridges, the maximum resistive load is 1,000 Ohms. 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 18: Cartridge Loading - Capacitive

    CARTRIDGE LOADING – CAPACITIVE The 2008 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 19: Operation

    Press the POWER pushbutton on the front of the 2008. The POWER indicator will be amber. The MUTE indicator will be red and the out- put will be muted for the first 3 seconds.

  • Page 20: Input Selection

    To enhance monaural recordings, it is often desired to mix the left and right channels together to form a true monaural signal. In the 2008 it is possible to do this at the output of both channels by turning on MONO mode.

  • Page 21: Equalization

    Select an equalization curve by pressing one of the pushbuttons labeled RIAA, EQ1 or EQ2. The 2008 will immediately mute the out- puts and the MUTE light will be red for 3 seconds. After that time, the output will be unmuted and the MUTE indicator will be off.

  • Page 22: Low Cut Filter

    LOW CUT FILTER The Boulder 2008 Phono Preamplifier uses a 3 pole (18 dB/octave) low cut filter which may be switched to one of 3 frequencies or com- pletely out (off). The frequency response will be -3 dB at either 5, 10 or 20 Hz.

  • Page 23: Cartridge Demagnetization

    Select the input connected to that cartridge by pressing its corre- sponding pushbutton. Press the DEMAG pushbutton. This will mute the 2008 output, the DEMAG and MUTE indicators will be red, and your cartridge will be connected to your demagnetizer.

  • Page 24: Mute

    The Boulder 2008 Phono Preamplifier provides an output mute fea- ture which is turned on by two different methods. First, the outputs are muted for three seconds when the 2008 is first turned on or an input or equalization pushbutton is pressed. Also, it will be muted when the demagnetization feature is on and for 3 sec- onds afterwards.

  • Page 25: Equalization Cards

    The Boulder 2008 Phono Preamplifier uses one of three equalization curves selected by the front panel pushbuttons labeled RIAA, EQ1, and EQ2. The 2008 is shipped with the RIAA as standard. Optional equal- izations may be purchased and installed by your Boulder dealer. These are PC cards which are installed into the EQ1 and EQ2 positions.
  • Page 26 RIAA REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 27 FFRR REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 28 EMI REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 29 COLUMBIA REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...
  • Page 30 NARTB REPRODUCE EQUALIZATION REF 0 DB AT 1 KHZ EQUALIZATION...

  • Page 31: Using A Recorder

    USING A RECORDER CONNECTIONS A recording device may be connected to the Boulder 2008 Phono Preamplifier. You may use balanced or unbalanced con- nections for both input and outputs as previously described in the sections on connecting sources and power amplifiers.

  • Page 32: Appendix

    2008 AUDIO BLOCK DIAGRAM DEMAG CARTRIDGE LOW NOISE PHONO LOADING ON 20 dB GAIN INPUTS PERSONALITY FOR MC CARD MM BYPASS RIAA EQ 1 EQ 2 5 Hz 10 Hz 20 Hz ADD 0 dB ADD 10 dB PLAYBACK 3-POLE...

  • Page 33: Specifications

    BOULDER 2008 PHONO PREAMPLIFIER SPECIFICATIONS Inputs 3 Balanced, Converts to Unbalanced Input Impedance, Maximum MC: 1000 Ω ; MM: 47kΩ 1kHz Gain, RIAA MC: 64 or 54, MM: 44 or 34dB Noise (EIN), MC 160 µV A-wtd, 275 µV Flat, 20 Hz to 20kHz...

  • Page 34: Troubleshooting

    Have cables tested _________________________________________________________________________ Defective power supply or preamp Return to dealer for service ______________________________________________________________________________________________________________ Amber POWER indication on 2008, Preamp is muted, MUTE is red Push MUTE so indicator is off _________________________________________________________________________ but no sound is heard No signal from turntable...
  • Page 35 TROUBLESHOOTING ______________________________________________________________________________________________________________ SYMPTOM CAUSE REMEDY ______________________________________________________________________________________________________________ One channel is louder than the other Gain switch not set equal Set gain switches on personality cards to same setting _________________________________________________________________________ MM/MC switch not set equal Set MM/MC switches on personality cards to same setting _________________________________________________________________________ Cartridge loading is not equal Check cartridge loads on...

  • Page 36: Notes

    NOTES APPENDIX...

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