The design features of Ampliwire 250 DMB

After the Electrocompaniet 25 watt amplifier had established a new standard for transistor amplifiers, research was undertaken to find ways to make the amplifier even better, and to extend its highly musical sound quality to more powerful amplifier designs. The engineers at Electrocompaniet were not satisfied by only reducing the commonly recognised types of distortion to low levels. They recognised that distortion appears in many forms, and that distortion was still audible in listening tests even when conventional categories of distortion were at astonishingly low levels.

Traditionally, designers increased feedback to make a larger portion of the output signal control the amplifiers response. Our listening tests showed us that simply applying more feedback was not the answer. In fact, as one kind of distortion went down, other parame- ters would be adversely affected, leading to an overall degradation of sound quality. We knew that the other conventional design approach of eliminating feedback completely was not the answer either, because this would cause high distortion levels, and as a result would produce a “woolly” sound.

The answer to the dilemma was found in a novel approach to feedback theory. We developed a feedback concept that allowed local feedback to be applied around individual stages of the amplifier circuit. This approach allowed us to avoid the sonic disadvantages of overall feedback from output to input. The concept was further developed to reduce phase- and interphase distortion between stages of the amplifier as well. We were able to concent- rate the loop feedback on the stages of the amplifier where it resulted in audible improvement.

Stability margins were also expanded because feedback no longer affected the frequency response. The use of this concept of individual gain blocks - complex in design but simple in function - allowed us to reduce distortion to minute values in all the products.

The amplifier is divided into two separate sections or gain blocks. The input block is a transconductance amplifier without overall feedback. This avoids large output current being fed back to the input, and mixed with the minute input signal. The output block is a transresistance amplifier with parallel feedback. This is done to prevent higher frequencies than the feedback loop can handle, from entering the loop. An approach like this will prevent Transient Inter modulation Distortion (TIM) and Slewing Induced Distortion (SID), eliminating the need for an extremely wide bandwidth.

All stages work in Class A with an efficiency of less than 0,1%. The power supply of the AW 250 DMB consists of two 650 VA toroidal transformer. Furthermore, the power supply consists of a 120.000 micro farad reservoir divided into twelve 10.000 micro farad capacitors in parallel with 4,7 and 0,1 micro farad polycarbonate- and polypropylene capacitors.

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Fine Digital AW-250 owner manual Design features of Ampliwire 250 DMB
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AW-250 specifications

The Fine Digital AW-250 is a state-of-the-art digital printer that has captured the attention of industry professionals looking for efficiency and high-quality outputs. This model stands out for its versatility and advanced printing technologies designed to meet the diverse needs of various businesses.

One of the key features of the AW-250 is its exceptional print resolution. With a maximum resolution of up to 1200 x 1200 dpi, the printer produces sharp and vibrant images, making it ideal for producing everything from marketing materials to fine art prints. The color accuracy and detail provided by the AW-250 help businesses create visually stunning materials that capture attention and leave a lasting impression.

Incorporating advanced digital inkjet technology, the AW-250 allows for a unique and efficient printing process. Unlike traditional printing methods, which often require extensive setup and materials, the AW-250 operates on a digital platform that reduces waste and increases turnaround times. This means that businesses can print shorter runs without incurring excessive costs, making it a flexible solution for a variety of print jobs.

The AW-250 is equipped with a range of software solutions that enhance its usability. These software options include user-friendly interfaces that facilitate easy file handling and color management, ensuring that users can optimize their prints effortlessly. Compatibility with a wide array of file formats also allows for seamless integration into existing workflows.

Another notable characteristic of the AW-250 is its robust construction and reliability. Designed to withstand the demands of high-volume printing, this model ensures consistent performance without sacrificing quality. Its advanced maintenance features also help reduce downtime, allowing businesses to stay productive.

The printer supports a variety of substrates, including paper, vinyl, and fabric, making it a versatile choice for projects such as banners, signage, and promotional materials. This adaptability ensures that the AW-250 caters to the diverse requirements of different industries.

In conclusion, the Fine Digital AW-250 is a technologically advanced digital printer that combines high-quality output, fast printing capabilities, and user-friendly software to support a wide range of printing needs. Its ability to produce exceptional results on various substrates makes it a valuable asset for businesses looking to enhance their print offerings.
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