Table of Contents
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Table of Contents
Related Manuals for VTL MB-125
Summary of Contents for VTL MB-125
- Page 1 MB-125 Monoblock 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.
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Page 4: Table Of Contents
..............7 Powering your system on ..................7 Ground Loop Hum .....................8 Powering the system off ..................8 Tetrode-Triode Switching ..................8 Bias Checking and Setting ..................8 Top view and Bias Measurement points of the MB-125 Amplifier ..........11 .............................12 CHAPTER 4 MB-125 Owner’s Manual... - Page 5 ........................12 Tube Life ........................12 Changing Tubes ........................13 Changing the AC and B+ Fuses ..............14 Cleaning .........................14 Transporting MB-125 ....................14 .............................15 CHAPTER 5 PECIFICATIONS ....................15 .............................16 CHAPTER 6 ..........................16 ARRANTY ............................17 APPENDIX Warranty Registration ...................17 Service Notes .......................17 MB-125 Owner’s Manual...
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Page 6: Chapter 1
The VTL team is proud that you have selected the MB-125 power amplifiers as a new member of your home audio system. We sincerely hope that the VTL MB-125’s will contribute towards your enjoyment of music and give you many hours of listening pleasure. -
Page 7: Location And Ventilation
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 MB-125 monoblock weighs approximately 50 lbs (22 Kg). -
Page 8: Chapter 2
Unpacking the MB-125 from its box The MB-125 monoblocks 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 Mb-125 Front Panel
Visually inspect through the vent holes to ensure that all tubes are fully seated before powering the unit on for the first time. If there are any tubes not fully seated then you should refer to your VTL dealer, and take this procedure with the amplifier. -
Page 10: Mb-125 Back Panel
The MB-125 Back View Connecting Your Amplifier to your system The MB-125 amplifier is a self-contained unit with the amplifier and power supply sections on one chassis. The two sections are assembled together in the factory and connected to each other via power cables. -
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: Ground Loop Hum
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 125 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 Caution: Bias checking and setting on all tubes must be performed every time a tube is replaced in an amplifier. For checking the bias you should take the unit and this procedure to your authorized VTL dealer and ask them to check the bias for you.
- Page 15 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.
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Page 16: Top View And Bias Measurement Points Of The Mb-125 Amplifier
Top view and Bias Measurement points of the MB-125 Amplifier MB-125 Owner’s Manual... -
Page 17: Chapter 4
Your VTL amplifier is a pure tube product designed to give you the continued optimum performance over a long time period. Even though the amplifier has undergone a burn-in cycle in the VTL factory, the tubes and circuits will require further usage and burn-in to reach maximum performance. During the first 100 hours of usage the amplifier will undergo noticeable improvements in sound. -
Page 18: Changing Tubes
Changing Tubes Do not attempt to change tubes yourself. Contact your authorized VTL dealer or the VTL factory service department so that this service can be performed by a trained technician. 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 19: Changing The Ac And B+ Fuses
Transporting MB-125 If you should ever need to ship your amplifier and need help doing so then ask your VTL authorized dealer to give you assistance in packing the unit into the cartons for the amplifiers. Your dealer should also be able to arrange for new cartons to be sent to you and help you with the packing should you require it. -
Page 20: Chapter 5
C H A P T E R Specifications MB-125 Monoblock power amplifier Vacuum Tube Complement 4 x EL34, 2 x 12AT7 Output Power Tetrode = 100 Watts 20 Hz – 20kHz, into 5 ohm load Triode = 50 Watts T.H.D. 20 Hz – 20 kHz @ 125W Tetrode: <... -
Page 21: 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 22: 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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