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Related Manuals for VAC Musicbloc Master 300 iQ
Summary of Contents for VAC Musicbloc Master 300 iQ
- Page 1 The VAC Master 300 iQ Musicbloc™ Mono/Dual Stereo Beam Power Amplifier Operation & Maintenance Information Valve Amplification Company Manual issued 01/26/2023 Valve Amplification Company, Inc. 2172 10th Street Sarasota, FL 34237 Phone 941-952-9695 FAX 941-952-9691...
- Page 2 CAUTION - SAFETY NOTICE THE AMPLIFIER AND POWER SUPPLY CONTAIN NO USER SERVICEABLE PARTS. DO NOT REMOVE THE BOTTOM PLATES OR CHASSIS COVERS. LETHAL VOLTAGES ARE PRESENT WITHIN THE CHASSIS. DO NOT OPERATE THE UNITS IF THEY ARE WET. VACUUM TUBES BECOME HOT ENOUGH TO CAUSE SERIOUS BURNS. NEVER TOUCH A TUBE WHEN THE UNIT IS ON.
- Page 3 INDEX Introduction Installation Connection diagrams Operation Illuminated Logo Installing New Tubes Operation of the VAC iQ Circuit Care Of Chassis Tips and Advice Fuses A Word About Tubes in General Output Tubes Low Level Tubes Grounding Tuning Your System Specifications Footnotes Warranty &...
- Page 4 INTRODUCTION The VAC Master 300 is a unique power amplifier, and one of the mret powerful and detailed in VAC’s history. Featuring a new fully balanced direct-coupled input & driver circuits, extremely fast and vivid sound is achieved. This amplifier features VAC’s patented* iQ Continuous Automatic Stable Bias System. This revolutionary invention is the only approach capable of keeping the true underlying idle point of each output tube unvarying and steady at all times.
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Page 5: Installation
INSTALLATION The amplifier is quite heavy. Consider the location carefully, and use appropriate help in lifting, etc., so as to avoid injury. Ensure that it will not tip over in your use; if there is a risk of this, especially due to children, take all necessary steps to secure the amplifier to a wall. - Page 6 Connect the power cord to the power source indicated on the rear panel (will be either 100, 120, 220, or 240 volts AC). Voltage conversions must be done at the factory of by an authorized VAC importer. Avoid power conditioners or power cables that float the ground pin. This is an unsafe practice, and could result in damage to your system and lethal shock.
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Page 8: Operation
Any time that the VAC Power Amplifier has not been used for a few weeks the sound may be different. This is also normal for high resolution audio equipment. Optimum sound should return after a few hours of operation, preferably with an audio signal. - Page 9 First, see the SAFETY NOTICE earlier in the manual. Output tubes are type KT88. Replacement output tubes should be purchased from VAC. It is desirable that tubes be in matched octets, and be close to the "bogey" values for the major parameters. Make certain that each tube fits firmly in its socket.
- Page 10 No system has been able to do this. Until now. The result of 17 years of research, the VAC iQ Bias Control System is the first and only system able to monitor continuously the true bias point of each output tube and hold it precisely at the desired value, thus ensuring optimal performance at all times.
- Page 11 IQ System Indicators GREEN = WEAK TUBE, REPLACE AT YOUR CONVENIENCE RED = DEFECTIVE TUBE, REPLACE, DO NOT USE AGAIN!
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Page 12: Care Of Chassis
CARE OF CHASSIS VAC chassis are machined aluminum for superior electromagnetic performance. The main chassis and the fascia are finished in an acrylic lacquer, similar to fine automobile; similar care must be taken in wiping or cleaning. THE AMP MUST BE SWITCHED OFF AND UNPLUGGED, and at no time may any cleaning material be... - Page 13 TIPS & ADVICE SECTION Tips: Fuses Your amplifier is designed to use “slow blow” type fuses. These are contained in the fuse drawer built into the power receptacle. In the fuse drawer are two fuses. The one furthers in is the active fuse. The one nearer to the outside is a spare.
- Page 14 5 years. It is normal to see a slight violet glow in a power tube such as a KT88. However, a vivid violet indicates excess current flow through the tube and should be investigated. VAC can test tubes for concerned customers.
- Page 15 Tips: Output Tubes Your VAC Amplifier uses the KT88 kinkless tetrode, with the Gold Lion (Russia) version provided. It is strongly recommended that replacement tubes be purchased only from VAC. If, however, you want to customize the sound to your tastes, be aware that as with interconnects and speaker cables, each tube manufacturer's KT88 tends to have a distinct sound, as well as its own reliability profile.
- Page 16 Tips: Audio Grounding Systems incorporating single-ended interconnect cables (“RCA cables”) are prone to a problem known as “ground looping”, which can result in extraneous hums and buzzes audible through the loudspeaker. If this occurs in your system, you have to attempt to minimize the ground loop. To minimize the buzz using the normal RCA input jack, there are several steps you can take: Use the shortest interconnects possible.
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Page 17: Specifications
SPECIFICATIONS The VAC Master 300 has been developed with the critical ear as the major arbiter of quality, with both conventional and unique measurements providing insight and guidance as necessary. The lack of emphasis on measurements is due to the fact that engineering's arsenal of equipment and techniques do not operate on the pattern recognition principals that control human perception of sound. -
Page 18: Warranty
Your equipment is warranted for a period of thirty (30) days from the date of purchase. In addition, if the registration form is received by VAC along with a copy of your sales receipt from an authorized VAC dealer within this thirty days, the warranty will be extended to two (2) years (tubes excepted).