US Amps AX - Manual (Page 18)

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VTCSD “follows” the high voltage tube signal STRAIGHT INTO THE SPEAKERS,
adding only current in a form of “amplifier power steering” — free from voltage gain
or negative amplifier feedback!
Vaccum tubes are renowned for their high dynamic range and smooth emphasis
of even-order harmonics. The transformer-less VTCSD circuit brings out hidden
qualities of the vacuum tubes, including excellent frequency response, smooth
“clipping” and high signal-to-noise ratio.
VTCSD divides audio signal amplification in two separate areas, voltage and
current. By starting with the vacuum tube as a source of high voltage(vacuum
tubes operate at four times the voltage of transistors), VTCSD adds a second
solid-state “amperage amplifier.” The “amperage amplifier” is a null-gain circuit
driven by “current syncs” that mirror the voltage signal and provide “torque” to the
speakers in perfect synchronization with the voltage content, that neither distorts or
colors the original tube sound!
The result are astonishing. All of the intensity, transience, and frequency
response of the vacuum tube, which can operate at MUCH higher output voltage
than audio transistors.
VTCSD
(continued)
Benefis of Class “DE”
Combines class “D” attributes with the versatility and practical
fidelity of class “AB” designs
Allows for 90% efficiency under extreme circumstances that turn
other digital amplifiers to toast
Represents the best power output-to-current consumption
DE
•
•
•
U.S.Amps continues to push the technological envelope with the introduction
of two new digital models that combine the attributes of “D” lass amplifiers
with the versatility and practical fidelity usualyy expericenced only with
standard Class “AB” designs. Thsi bold leap forward in digital technology
allows for 90% effieciency under extreme dircumstances that turn other
digital amplifiers to toast. As cars become more and more energy efficient
and provide less available battery power, Class “DE” represents the best
power output-to-current consumption available on the market today!