VTL ST-150 User Manual
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VTL ST-150 User Manual

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VTL
ST-150 Stereo Power Amplifier
Owner' s Manual

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Summary of Contents for VTL ST-150

  • Page 1 ST-150 Stereo Power Amplifier Owner’ s Manual...
  • Page 2 Information in this document is subject to change without notice. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission by VTL.

  • Page 4: Table Of Contents

    Ground Loop Hum .....................7 Powering the system off ..................8 Tetrode-Triode Switching ..................8 Bias checking and Setting ..................8 Top view and Bias Measurement points of the ST-150 Amplifier...........10 .............................11 CHAPTER 4 ARE AND AINTENANCE OF YOUR MPLIFIER .......................11 ST-150 Owner’s Manual...
  • Page 5 ........................11 Tube Life ........................11 Changing Tubes ........................12 Changing the AC and B+ Fuses ..............13 Cleaning .........................13 Transporting ST-150 ....................13 .............................14 CHAPTER 5 PECIFICATIONS ....................14 .............................15 CHAPTER 6 ..........................15 ARRANTY ............................16 APPENDIX Warranty Registration ...................16 Service Notes .......................16 ST-150 Owner’s Manual...

  • Page 6: Chapter 1

    The VTL team is proud that you have selected the ST-150 power amplifiers as a new member of your home audio and home theater system. We sincerely hope that the VTL ST-150 will contribute towards your enjoyment of music and give you many hours of listening pleasure.

  • Page 7: Servicing

    Tube amplifiers can be heavy and awkward to lift, with the weight unevenly distributed, and you should not attempt to move the unit without help. Each unit of the ST-150 Stereo weighs approximately 58 lbs. (26.4 Kg).

  • Page 8: Chapter 2

    Unpacking the ST-150 from its box The ST-150 Stereo amplifiers are shipped in cartons and wrapped in thick plastic. The plastic is not strong enough to support the unit, and may tear if you try to lift the unit out of the box with it. Also there are protruding switches which could break if the unit is not properly handled, and in addition to the awkward, unbalanced heavy load the unit has a cleaning polish on it which makes it slippery and hard to grasp.

  • Page 9: The St-150 Front Panel

    The ST-150 Front Panel The ST-150 Front Panel shows the Power on switch and the power on LED indicator. Check for tube placement Use the following procedures to check whether the tubes standing on the deck of your amplifier are placed firmly in their sockets, as the tubes can become dislodged and loosen during shipping or unpacking of the amplifier.

  • Page 10: St-150 Back Panel

    The ST-150 Back Panel Silkscreen Connecting Your Amplifier to your system The ST-150 Stereo amplifier is a self-contained unit with the amplifier and power supply sections on one compact chassis. Follow the instructions below to connect the amplifier to your audio or home theater system: Connect all source components (e.g.

  • Page 11: Voltage Setting

    Your amplifier is shipped with a power cord that matches the requirements of your country. If you need a replacement and you are not sure what the appropriate cord should be, consult your authorized VTL dealer or the VTL factory customer support department.

  • Page 12: Chapter 3

    If you haven’t already done so, visually (by looking through the cage vent holes) ensure that all the tubes inside the VTL amplifier are properly seated all the way into their sockets. Make sure that the power amplifier is not powered on at this stage by either disconnecting it from the AC source or turn the power on switch on the front panel of the amplifier to the “off”...

  • Page 13: Powering The System Off

    Tetrode-Triode Switching Your VTL power amplifier gives you a choice of listening to your system in tetrode mode or in triode mode. In tetrode mode, your amplifier is capable of delivering up to 150 watts per channel. This mode of operation is most suited to music that requires a wide dynamic response and lots of bass punch.
  • Page 14 The resistance reading on each point should be 10 ohms, within a 10% range. If the resistance reading is outside the acceptable range, please consult the VTL factory customer service department immediately. Repeat the measurement procedure for all 4 bias measurement points.

  • Page 15: Top View And Bias Measurement Points Of The St-150 Amplifier

    Caution: If your observations do not conform to the above instructions, or if you do not feel confident about performing the bias procedures yourself, please consult with the VTL factory service department. Improper setting of the bias will affect the current draw of the output tubes and affect the performance and lifetime of the tubes.

  • Page 16: Chapter 4

    Leaving your amplifiers running idle when you are not listening to music will be a waste of electricity as well as unnecessary usage of the tube life. Tube Types The VTL ST-150 Stereo amplifier uses a total of eight 6550C tubes for the output stage and two 12AT7 and two 12BH7 tubes for the input and driver stages. Tube Life Your VTL amplifier has been designed to ensure long tube life.

  • Page 17: Changing Tubes

    Changing Tubes Do not attempt to change tubes yourself. Contact your authorized VTL dealer or the VTL factory services department so that a trained technician can perform this service. You will need to take the unit and this procedure to your dealer for them to perform this procedure and the corresponding bias procedure properly.

  • Page 18: Changing The Ac And B+ Fuses

    VTL dealer or the VTL factory service department. Cleaning Your VTL amplifier should be dusted occasionally with a damp non-abrasive cloth. You should not use any solvents for cleaning the front panel, as this can damage the lettering and the finish. It is recommended that you use a contact cleaner such as Pro-Gold on the input and output connectors regularly to ensure optimum sound and proper signal conducting capability.

  • Page 19: Chapter 5

    C H A P T E R Specifications ST-150 Stereo power amplifier Vacuum Tube Complement 8 x 6550C, 2 x 12AT7, 2 x 12BH7 Output Power Tetrode: 120 watts per channel 20 Hz – 20kHz, into 5 ohm load Triode: 60 watts per channel T.H.D.

  • Page 20: Chapter 6

    If a VTL product fails to perform properly under the above warranty then the purchaser's sole remedy shall be to return the product to the authorized VTL dealer or to VTL Amplifiers Inc, where the defect will be repaired without charge for parts and labor. The product will then be returned via prepaid, insured freight, method and carrier to be determined solely by VTL Amplifiers Inc.

  • Page 21: Appendix

    VTL importer regarding product registration and warranty procedures. To obtain valid US warranty service, please fill out the enclosed VTL Warranty Registration card and mail it together with a COPY OF THE ORIGINAL BILL OF SALE to the following address within the first...

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