VAC Signature Preamplifier Mk I - Manual (Page 3)

INTRODUCTION
The Renaissance Signature Preamplifier is the world’s finest audio preamplifier and an
absolutely unique component. Its unusual topology, premium parts, and flexibility make it
a pleasure to hear and operate.
The line stage is, in effect, a small Class A1 power amplifier, capable of driving loads as low
as a few hundred ohms. This is a stark contrast to normal preamplifiers, which claim a low
output impedance but completely collapse when asked to deliver current. The Renaissance
Signature circuit is loafing with a normal load in the 10,000 to 200,000 ohm range, delivering
an effortless, musical performance.
There is no loop feedback and no coupling capacitors in the line section. All active
elements are triode tubes, the purest, most linear amplifying devices yet invented. Output
matching is accomplished by way of superb output transformers. As a side benefit, different
output grounding configurations are possible, optimizing performance into either balanced
or single-ended loads, and allowing ground loops to be broken.
The optional phono stage uses six twin triodes operating without loop feedback. Gain is
moderately high, with a very low noise floor. Low output MC cartridges are accommodated
by means of high quality matching transformers, which contribute voltage gain without noise,
resulting in detail that emerges from a remarkably dark and neutral background. A
completely separate power transformer and filter system is provided for the phono stage,
eliminating all unwanted interaction with the line stage.
Remote control is implemented via motorized mechanical devices. This is expensive, but
provides two major advantages. First, the Signature Preamplifier controls are completely
intuitive to use. Second, we avoid the sound degradation attendant with VCAs, relays,
transistor switches, and switched resistor arrays.
The massive chassis is machined from quarter inch thick aluminum plate and fitted with
damping material for a strong, resonance-resistant structure. The half-inch thick fascia has a
hand rubbed gloss lacquer finish.
The audio circuitry and power supply are completely hand wired.
The Renaissance Signature Preamplifier is designed not to the latest fad but to substance,
for the highest possible sound quality. Time spent familiarizing yourself with this manual will
be well rewarded.