US Amps AX User Manual download pdf (Page 17)

Why Tubes?

You may know that a transistor is a

modern, efficient, less expensive version of

a vacuum tube, which is the device that made

sound recording and reproduction possible in the

first place. Now, the electronics industry has been

trying for many years to equal the sound quality available from tubes. They have

been able to make transistor amps louder, cooler, more abusable, and less expen-

sive than tubes, but to this day, they’ve been unable to make any solid state amp

sound as good as a tube amp.

So, our engineer got to wondering, “What if I combined the sonic character of a

vacuum tube with the drive capabilities of solid state?”

Well, the result is the U.S.Amps’ VTCSD hybrid amps. Using the signal path

directly out of the tubes as a “steering” signal and the following drive signal wave

from the transistors as the “motor,” with absolutely no negative feedback as a

corrective to the transistor’s waveform, we achieved the most detailed, pleasing,

articulated sound available in mobile audio today.

Positive Current Sync

Negative Current Sync

Input signal is fed

DIRECTLY into the tube.

ere are no solid state

gain stages or processors

in the signal path.

Direct Input

Vacuum Tube Current Sync Drive

e original high voltage tube signal is joined by

a null-gain current following circuit that is pulled

to the voltage rails by an opposing pair of

current syncs, providing a sort of ampliﬁer

“power steering” to deliver speaker-driving

power without taxing the character of the

original tube voltage content.

fed into Output

Transformer

Yet lacks much of

the tubes’ original

dynamic range

e resultant signal

is soothing and

pleasing

Output

Transformer

converts

Voltage

Energy

into

Current

High Voltage/Low Current

Signal from Output Tube is

Low Voltage

Low Current

Tube Input

Classic Vacuum Tube Amps w/Output Transformer

Smooth, Low

Tube Vo l t age

Negative Feedback

Transistor Switching

Noise

Listening Fatigue

Compression

and Coloration

Solid State Ampliﬁer

Uneven Clipping

Odd-order Harmonics

Preamp Signal

Low Voltage

Low Current

Solid State Input

Hybrid Tube/Transistor Amps

Tube In, Tube Out

(Vacuum Tube Current Sync Drive)

VTCSD

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US Amps AX User Manual Page 17

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