Imitation AURA-VA50 Amplifier

AURA VA50 is a company known for its production starting around 1989, marking a brief history. The launch of its products garnered attention from enthusiasts worldwide, establishing AURA's style. The company manufactured the VA amplifier series, which has been consistently retained. The VA80SE and VA100 models differ from the early VA50 primarily in appearance, while the VA50 is characterized by its simplicity, adhering to a minimalist design philosophy. This simplicity is evident not only in its external design but also in its internal circuitry. A notable feature of this circuit is its high gain power amplifier, achieving magnification levels up to 40 dB, which eliminates the need for a preamplifier, effectively functioning as a standalone amplifier. Additionally, to cater to vinyl enthusiasts, an internal NE5532 RIAA balanced amplifier has been incorporated. However, this feature may be challenging for most domestic users. The main amplifier circuit resembles that of the Octopus DCf 211B, utilizing MOSFETs for output, which reduces the power requirements of the driving stage, resulting in a more streamlined circuit. Apart from the original Hitachi FET power transistors, other components are standard materials. The circuit's simplicity makes it generic and cost-effective, although many domestic imitations often omit the RIAA function.

The AURA VA50 amplifier circuit represents an innovative approach to audio amplification, emphasizing both performance and user accessibility. The amplifier's design is rooted in the principles of high-fidelity audio reproduction, where the high gain of 40 dB is a critical feature that allows for significant amplification without the necessity of a preamplifier. This design choice not only simplifies the overall system but also reduces potential signal degradation that can occur when multiple stages of amplification are involved.

The inclusion of the NE5532 RIAA balanced amplifier is particularly noteworthy, as it caters to the niche market of vinyl record enthusiasts who require precise equalization for optimal playback. This internal component ensures that the audio signal is accurately processed, preserving the integrity of the sound. Despite its advanced features, the amplifier maintains a straightforward design philosophy, making it accessible to a wide range of users.

The circuit layout, which is similar to the Octopus DCf 211B, showcases the effective use of MOSFET technology. By utilizing MOSFETs in the output stage, the design optimizes power efficiency while providing robust performance. This choice of components not only enhances the amplifier's reliability but also contributes to a compact and elegant circuit design.

Overall, the AURA VA50 amplifier circuit exemplifies a blend of simplicity, functionality, and high-performance audio engineering, making it a significant offering in the realm of audio amplification. The design's focus on essential features while maintaining cost-effectiveness ensures its appeal to both enthusiasts and casual users alike.AURA VA50 company is famous for, from about 1989 to begin production (from this point we can see AURA company s history is very short) opening a launch would cause the aircraft enthusiasts worldwide attention, and thereby determining the style in the company AURA manufactured after VA amplifier series has been retained. Now difficult to see from the appearance of VA80SE VA100 and mouth distinction between early VA50 VA50 biggest feature is simple (in line with the simple first principle fever), which is not only in its appearance, but also in and on its internal circuitry, the circuit where the most characteristic is the high magnification power amplifier, since the magnification up to several times the loo (40dB), as well as eliminates the need for a preamplifier, so its interior is actually a step functions amplifier.

In addition, to take into account those LP enthusiasts, also established its internal core of a NE5532 RIAA are balanced amplifier. But for the vast majority of domestic enthusiasts, it would be difficult to use this feature. AURA main amplifier circuit shown in Figure 7-38, the circuit is in fact very similar to the Octopus DCf 211B, since the output using a MOSFET, it can save power driven stage, so that the whole circuit is more concise.

In addition to the overall amplifier circuit original beam pupa Hitachi FET power on the tube, the other elements are the use of materials in general. Because the circuit is very simple, it is very generic and therefore easy and convenient in order to save costs, while most domestic imitation omitted enthusiasts have very heap used RIAA function.

Based on years of experience.