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Nagra HD PREAMP Owner's Manual

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HD PREAMP
HD PREAMP
OWNER MANUAL
OWNER'S MANUAL
RELEASE ©2019

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Summary of Contents for Nagra HD PREAMP

  • Page 1 HD PREAMP HD PREAMP OWNER MANUAL OWNER’S MANUAL RELEASE ©2019...
  • Page 3 /// Dear music lover Congratulations, you have just purchased one of the best preamplifiers ever made! The HD PREAMP was created by an engineering team with more than 60 years of experience designing world-class products for the professional audio, national security and military businesses.

  • Page 5: Table Of Contents

    SUMMA RY Safety warnings Warranty Package contents INSTALLATION OF YOUR HD PREAMP Choosing a location Horizontality adjustment of the chassis Powering the HD PREAMP Connection to the Mains Connection/Disconnection of LEMO cables Fuse replacement HD PREAMP description Front panel (audio device chassis)

  • Page 6: Safety Warnings

    The power supply voltage can only be changed at the factory. Make sure you have the right operating voltage before switching your device ON. • The HD PREAMP is CLASS I equipment. It is essential that it is connected to a MAINS socket outlet with a protective earthing connection.

  • Page 7: Warranty

    We guarantee our products against all manufacturing defects. For the HD PREAMP, this is for a period of three years from the date of delivery to the customer (validated by the serial number on the device casing and the invoice from an official Nagra dealer).

  • Page 10: Installation Of Your Hd Preamp

    Choosing a location The HD PREAMP is designed exclusively for indoor use in a moderate climate. The HD PREAMP is contained in two chassis: one audio device and one power supply. These chassis feature an anti-vibration base that allows for putting either one chassis on top of the other or one chassis next to the other, while remaining completely insensitive to vibration.

  • Page 11: Powering The Hd Preamp

    N AGR A H D PRE AMP // IN S TALL ATI ON // 010 + 011 Powering the HD PREAMP The power cord of the HD PREAMP is connected on the rear panel of its power supply chassis. The power supply chassis converts the Mains supply into several different regulated voltages sent to the audio device chassis through two umbilical cords with LEMO plugs.

  • Page 12: Connection/Disconnection Of Lemo Cables

    Connection/Disconnection of LEMO cables Turn the front selector of the audio device chassis to the OFF position. Insert one LEMO plug of each umbilical cord into the matching LEMO socket at the back of the power supply chassis. Please note that the red dot on the LEMO plugs must be facing up before trying to insert them into the chassis sockets.

  • Page 13: Fuse Replacement

    So if you possess several HD DAC X Nagra HD devices such as an HD PREAMP and an HD DAC X, be sure to connect the right power supply chassis with the right audio device chassis by using the correct cables (same colour of ring).

  • Page 15: Hd Preamp Description

    RCA/XLR outputs selection switch. Front rotary selector. When turned ON, the HD PREAMP will enter a 4 minute preheating phase in order to optimize tubes and warm up critical components. This will allow your HD PREAMP to offer excellent performance for a longer period of time.

  • Page 16: Rear Panel (Audio Device Chassis)

    (selection with switch). Please find more details in the following paragraphs. Be careful, when cabling sources and amplifiers to your HD PREAMP, to properly connect them with the appropriate cables so as not to decrease audio signal quality! Pay attention...

  • Page 17: Audio Inputs

    NAGRA HD PR EAMP // IN STAL LA TI ON // 016 + 017 Audio inputs RIGHT LEFT The input is selected with the front rotary selector (see page 22). On both channels, sensitivity of RCA1 and RCA2 inputs is fixed (1V) whereas XLR1, XLR2 and RCA3 inputs have adjustable sensitivity.

  • Page 18: Bypass Inputs

    The signal is directly routed to the XLR outputs. Be careful when using a source with volume control. To avoid any damage to the speakers, adjust the volume of the source to the minimum before setting the HD PREAMP in Bypass mode.

  • Page 19: Audio Outputs

    • AUX means auxiliary output with a variable output level according to the volume control position. WARNING Please be sure not to have any potential difference between HD PREAMP and other equipment (correct grounding). Otherwise there is a risk of HD PREAMP damage when adjusting volume level.

  • Page 20: Rear Panel (Power Supply Chassis)

    + voltage version & fuse value information Ground post About ground post This feature is seldom used but can sometimes come in handy to solve specific setup issues. Your NAGRA dealer will assist you on when and how to use this connector.
  • Page 21 N AGRA HD PR E AM P // I N STA LLATI O N // 02 0 + 0 21...

  • Page 22: Operation Of Your Hd Preamp

    INSTALLATION OF YOUR HD PREAMP. Power on & Audio input selection To use your HD PREAMP, firstly you must push the Mains power switch to position 1 (ON). The Mains power switch is located on the rear panel of power supply chassis.

  • Page 23: Light Intensity Adjustment

    (useful for resynchronizing volume controls). Mute The outputs of the HD PREAMP can be set to standby mode when MUTE you activate the MUTE switch. Pulling up the switch will activate the muting (no more sound) and light the yellow LED.

  • Page 24: Ir Remote Control Unit

    IR Remote Control Unit The HD PREAMP currently comes with the new IR Remote Control Unit with Philips RC-5 format encoding. You may also use a Nagra RCU or RCU-II IR Remote Control Unit. As they require a different communication protocol (RECS-80), please contact your Nagra dealer to make the necessary adjustments inside your HD PREAMP.
  • Page 25 Insert the unit into the docking station to charge the Li battery. Power OFF / ON key Toggle key to switch the HD PREAMP ON and OFF. When switching ON, HD PREAMP automatically turns the front selector to the last input selection active before last power OFF.
  • Page 26 WHITE blinking = The Li Battery in Remote Control Unit is charging. RED blinking = The Remote Control Unit is defective. Please contact your Nagra dealer. Permanently OFF = The Li Battery in the Remote Control Unit is fully charged or the Remote Control Unit is not properly inserted into the docking station.

  • Page 27: Use Of A Universal Ir Remote Control Unit

    The HD PREAMP responds to IR (Infra Red) signals encoded in Philips RC-5 format. A default code 16 has been allocated to the HD PREAMP as a preamplifier. Should you wish to program your universal remote control, please use the following table:...

  • Page 28: Remote Automation

    (ON-OFF key switch on IR Remote Control Unit no longer works). Short between TIP and RING: HD PREAMP is RING switched ON. As soon as the HD PREAMP is SLEEVE switched ON, the front rotary switch turns itself to the selected input before it was last switched off.

  • Page 29: Tube Ageing

    → Presence of pops, brief noises in the low frequencies → Presence of hiss, higher background noise → Reduction of spaciousness, loss of naturalness As soon as one of these signs appears, please contact your Nagra dealer to order an HD PREAMP replacement tube kit. HD PREAMP software update The update is carried out with two MicroSD memory cards, one for the audio device and one for the power supply.

  • Page 30: Technical Specifications

    TECHNICAL SPECIFICATIONS // HD PREAMP Input impedance > 50 kΩ Output impedance < 0.2 Ω Volume @ -15 dB < 40 Ω Volume @ 0 dB Frequency response 10 Hz - 100 kHz +0.1 dB / -0.1 dB 10 Hz - 200 kHz +1.5 dB / -0.2 dB...
  • Page 31 MADE IN SWITZERLAND MANUFACTURER AUDIO TECHNOLOGY SWITZERLAND © NAGRA // EDITION 2019...
  • Page 32 nagraaudio.com...

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