TAD A1000 Evolution Integrated Amplifier

Ultimate symmetry in circuitry and layout

In the TAD-A1000, the circuit pattern and components are symmetrically arranged along the center of the chassis on the audio motherboard of the critical preamplification circuit to suppress even the slightest amplification errors between positive and negative signals, as well as between right and left channels. The pursuit of perfect symmetry extends further. We have laid out three power transformers, the chassis construction, and rear-panel jacks symmetrically to achieve optimal structural weight distribution and vibration balance.

High-capacity transformer with greater purity and efficiency

The internal coils of TAD-A1000’s high-capacity toroidal transformers are directly connected to its power supply circuit. The cross-section of the transformer core was designed in a circular shape to enhance the contact between the core and coils, thereby minimizing unwanted leakage magnetic flux and vibrations. This design results in a power supply with improved purity. Extremely low energy-conversion loss, thanks to the strong coupling between the primary and secondary winding of the transformer, low load fluctuations resulting from parallel winding, and the use of TAD’ s proprietary 33,000 μF electrolytic capacitors contribute to the analog power supply’s enhanced driving capability, even under abrupt load fluctuations, and outstanding high-speed responsiveness.

Immaculate preamplification circuit

The TAD-A1000’s flat amplifier in the preamplification stage features a high-performance, single-stage current-feedback amplifier, initially developed for Reference Series preamplifiers. To optimize signal complementarity, we evaluated the performance characteristics of each FET device and selected matching pairs for positive and negative elements in the TAD-A1000. This attention to detail has substantially enhanced the stability of its preamplification circuit.

Delivering 500W of Total Power

The integration of an analog power supply circuit comprising twin high-capacity toroidal transformers and electrolytic capacitors with a Class-D output stage established the foundation for a pure amplification stage and an exceptionally high-speed and powerful response. Direct FET devices with ultra-low on-resistance in leadless packages facilitate signals with sharp rising edges. The highly efficient Class-D output stage, which generates minimum heat and eliminates the need for conventional heat sinks, delivers an impressive 250 watts of power per channel.

Center-mounted, ball-bearing-supported volume knob

The volume knob exudes an exquisite aesthetic and tactile experience. It is meticulously mounted on high-precision ball bearings, ensuring an exceptionally smooth and effortless rotation, a hallmark of TAD’s hi-fi audio components. The center-mounted design of the volume knob signifies the symmetrical arrangement of the internal circuits. The TAD-A1000 adheres to a design language shared with other offerings in the Evolution Series.

Elaborate vibration-control design

Inside the TAD-A1000, four independent chambers isolate the preamplifier, power amplifier, transformer, and control circuits, effectively suppressing vibration and maintaining stable grounding. The power supply section, both mechanically and electrically shielded, minimizes noise to ensure the purest possible signal transmission. Three feet with internally inverted spikes decouple the chassis from floor-borne vibrations, delivering tighter, more dynamic sound and a naturally expansive spatial image. Heavy-duty terminals—identical to those used in the Reference Series power amplifiers—provide secure cable connections and outstanding signal integrity.

TAD’s custom-made parts and components

The TAD-A1000 incorporates numerous custom-designed components to achieve exceptional sound purity. Its precision electronic volume control delivers ultra-low distortion, while nonmagnetic parts and gold-plated OFC wiring ensure the highest signal integrity. In the power stage, four large-capacity electrolytic capacitors—developed through extensive testing and listening—provide powerful, responsive energy delivery.