The VAC Sigma 160i is a full, true integrated tube amplifier.
These days, it is common for amplifier manufacturers to take a basic power amplifier, slap on a volume control and selector switch, and call it an integrated amplifier. Unfortunately, this approach invariably results in significant sonic compomise, and generally lacks the dynamics and authority one expects in first class sound reproduction.
In the Sigma 160i, VAC has combined all of the elements of separate components into a single, well integrated package. There is a true line stage (with optional balanced inputs), a proper volume control (not a digital or VCA control on a microchip), a superb power amplifier with direct input capability for integration into multichannel/home theater systems, and an excellent phono stage (MM standard, MC optional).
With all of the proper elements present, the true performance possibility of the integrated form is fully realized. This results from the fact that every single stage in the audio chain is in intimate proximity and can share a very tight, precise common ground reference. Like the foundation of a house, this provides a basis from which magnificent things arise.
To ensure coupling only when and where desired, the Sigma 160i incorporates a separate rectifiers and power filters for the preamplifier sections for greater purity and stability.
Similarly, the mechanical placement of all of the parts, from the transformers to the vacuum tubes to the capacitors and resistors has been undertaken using the principals embodied in our cost-no-object Statement amplifiers. Each part is a radiator or receptor of stray energy; with careful analysis and orientation, unwanted interactions can be eliminated, all while avoiding the heavy handed approach of bandwidth-robbing shielding.
At its heart, the VAC Sigma 160i just plain makes music. Coupled with its modest price relative to other VAC components and the easy to live with form factor, the Sigma deserves your careful consideration.
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Basic specifications:
Copyright 2012 by Valve Amplification Company. All rights reserved. Specifications subject to change without notice.
Rotating photos by Keith Sequeira, The Audio Company, Atlanta