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Balanced Audio Technology VK-P90 Special Edition Owner's Manual

Balanced phono stage

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WARRANTY REGISTRATION FORM
Unit Serial Number: _______________________________________
Customer Name:
Address:
Date of Purchase:
Purchased From:
Dealer Name:
Address:
IMPORTANT NOTE:
In order to receive the full five-year product warranty, please mail this
completed form together with a copy of your sales receipt to Balanced Audio
Technology at the address below, within thirty days of purchase.
Failure to do so will result in the product being warrantied for one year
from the date of manufacture.
1300 First State Blvd. W ilmington DE 19804 Tel: 302 -999-8855 www.balanced.com
VK-P90
_______________________________________
_______________________________________
_______________________________________
_______________________________________
_______________________________________
_______________________________________
_______________________________________

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Summary of Contents for Balanced Audio Technology VK-P90 Special Edition

  • Page 1 VK-P90 WARRANTY REGISTRATION FORM Unit Serial Number: _______________________________________ Customer Name: _______________________________________ Address: _______________________________________ _______________________________________ Date of Purchase: _______________________________________ Purchased From: Dealer Name: _______________________________________ Address: _______________________________________ _______________________________________ IMPORTANT NOTE: In order to receive the full five-year product warranty, please mail this completed form together with a copy of your sales receipt to Balanced Audio Technology at the address below, within thirty days of purchase.
  • Page 2 VK-P90 Special Edition Balanced Phono Stage Owner's Manual 1300 First State Blvd. W ilmington DE 19804 Tel: 302-999-8855 www.balanced.com...
  • Page 3 NOTE: Your VK-P90 Phono Preamplifier was preset at the factory to the following configuration: Input Mode: Direct Gain: High Input Resistive Loading: 47k Input Capacitive Loading: None Please refer to the chapter on configuration switch setting for information on optimizing the unit parameters.
  • Page 4: Package Contents

    Introduction Thank you for your purchase of the Balanced Audio Technology Special Edition VK-P90 balanced phono stage. Please read this owner's manual to obtain the full benefit of the VK-P90 in your system. It will provide you with the needed safety information and operating procedures for this exceptional unit.
  • Page 5 Reseating Tubes Normally, reseating tubes upon delivery is not required. However, if any tubes have noticeably drifted out of position due to unusually high transportation stress, it will be advisable to reseat the tubes. Use the supplied Torx wrench to remove the top cover. Reseat the tubes in their sockets and reinstall the top cover.
  • Page 6 Connecting the VK-P90 to Your System Cartridge Input The back panel of the VK-P90 phono stage is equipped with two sets of input connectors: RCA input connectors XLR input connectors Either set can be used for connection. This gives the user the flexibility in connecting the phono cartridge cable to the VK-P90.
  • Page 7: Power Switch

    Description of Controls Power Switch The power switch toggles between two positions: OFF and ON. Putting the unit in the OFF position (even for a short period of time) will reset the soft start and mute circuits. The VK-P90 will then require about 45 seconds to return back to normal operation. When you turn the unit ON, the VK-P90 will automatically go through a gentle power-on sequence.
  • Page 8: Configuration Switches

    Configuration Switches WARNINGS: Please make sure that the VK-P90 is turned OFF and your preamplifier is in MUTE before changing the state of any internal configuration switches in VK-P90. Hazardous voltages are present on the unit’s printed circuit board. DO NOT operate the VK-P90 with its top cover removed.
  • Page 9 Figure 1 Cartridge loading switches S101 and S201 Resistance: The 47K load resistor is permanently connected to the cartridge input. If a different loading value is desired, it can be obtained by switching in additional resistors, installed on the VK-P90 PC board. This is accomplished by using the two DIP switches, S101 and S201, that allow multiple choices for resistive and capacitive cartridge loading.
  • Page 10: Gain Switch

    Capacitance: Various values of capacitors can be connected in parallel to the input via switches S101 and S201. With these switches in the OFF position, there is no capacitive loading to the cartridge. The capacitance choices include: Switch Position Capacitor Value 100pF 470pF 1000pF...
  • Page 11: Fuse Protection

    Factory supplied fuses should be only replaced with the same type and rating parts. Servicing The Balanced Audio Technology VK-P90 should require no service other than changing tubes to maintain its high performance. The vacuum tubes used in the VK-P90 are high quality 6922’s and 6SN7’s rated for approximately 5000 hours of use.
  • Page 12 VK-P90 Specifications Total Energy Storage: 200 joules Gain at 1kHz: (The following user-selectable values are available) Input Mode Switch Gain Switch Gain Direct position: 44dB High 59dB With step-up: 64dB High 79dB Signal-to-Noise Ratio: (A-weighted, referenced to 1mV) Low position 75dB High Position 78dB...
  • Page 13 (available from the factory via phone or fax). Upon receipt of defective product, Balanced Audio Technology agrees to repair the product without charge for parts (except vacuum tubes if the unit is more than one year old), or labor. The product will then be returned via prepaid, insured freight, with carrier at the sole determination of Balanced Audio Technology.