Related Manuals for VAC Sigma
Summary of Contents for VAC Sigma
- Page 1 Valve Amplification Company VAC Sigma Preamplifier Instructions Manual issued - 3 March 2008 Revised 2 April 2008 Please read carefully before installing Copyright 2008 by Valve Amplification Company. All rights reserved.
- Page 2 President, VAC INTRODUCTION The VAC Sigma Preamplifier is an all new design derived from the VAC Phi Beta, and employs four twin triode vacuum tubes operating in Class A. This unique design provides great speed, detail, punch, and musicality, all without global feedback. Its moderate gain structure and low output impedance provides an excellent match with a wide range of popular power amplifiers.
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Page 3: Wall Outlet
GENERAL PRECAUTIONS & SAFETY NOTES DANGEROUS VOLTAGES EXIST WITHIN THE CHASSIS. DO NOT REMOVE CHASSIS COVER UNTIL UNIT HAS BEEN SWITCHED OFF AND UNPLUGGED FROM THE WALL OUTLET (POWER) AND ALL COMPONENTS FOR 15 MINUTES. TUBES BECOME HOT IN USE, AND CAN CAUSE INJURY. - Page 4 Always mute the preamplifier before switching it off. The best practice is to also turn off your power amplifier(s) before turning off the preamplifier. As with all high performance audio products, the sonic characteristics of all VAC products will continue to improve during the first several hundred hours of use.
- Page 5 RCA jacks labeled “Home Theater Direct”. When the control is set to the “Cinema” position, the Sigma functions as a pass-through ONLY, and is controlled by the external processor, preamplifier, or other component connected to the “Home Theater Direct”...
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Page 6: Remote Control
NOTE ON ABSOLUTE PHASE Through the main RCA outputs Sigma Preamplifier inverts absolute phase. There is some debate about the audibility of absolute phase, and it generally is not controlled for by the recording industry (i.e., about half of your recordings may have inverted absolute phase). -
Page 7: Maintenance
Use of a coarser cloth or failure to otherwise protect the faceplate may result in damage to the finish. VAC is not responsible for cosmetic damage resulting from improper care or packing. -
Page 8: 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, a service contract will be extended to cover your equipment for two (2) years (tubes excepted). - Page 9 VAC SIGMA PREAMPLIFIER SPECIFICATIONS (typical) Type: Vacuum tube line stage with home theater (direct power amplifier) mode. Options: Remote control for volume & mute Dedicated MM phono input Dedicated MC phono input Line stage preamplifier: Gain: 24 dB Maximum input signal:...
- Page 10 What other brands and models did you consider? __________________________________________________________________________ __________________________________________________________________________ What made you decide on the VAC? __________________________________________________________________________ __________________________________________________________________________ Please provide any comments on VAC products or your dealer __________________________________________________________________________ __________________________________________________________________________ What magazines do you read regularly? ________________________________________________________________________ ________________________________________________________________________ What are your hobbies?