The new and upgraded Quad 303 Power Amplifier is an outstanding stereo amplifier initially known in 1967 in Britain’s hi-fi market. The brains behind this amplifier were the Quad 33 Pre-Amplifier and the Quad 303 Power Amplifier. It quickly became a widespread name in the world audio industry because of its remarkable sound quality, design innovation, and masterly engineering production.
Outstanding Sound Reproduction
The product, also named Quad Electroacoustics, was instrumental in its success. It was an intrinsic part of the larger company’s commitment to maintaining a simple design that delivers high-fidelity, enhanced clarity and outstanding sound reproduction.
Advertised as one of the first to use the โcurrent dumpingโ invention. Presented by the person who came up with the idea. It was none other than Peter Walker. The Quad 303 Power Amplifier was one of the first products to use such a method, resulting in high fidelity, low distortion, and ample power supply. To realize this, the 303 employed a technology with more efficient operation.
Power 140W @ 8 ohms (bridged)
The novel version has an entirely complementary output stage that achieves better linearity and stability, gaining sound quality even under challenging circumstances. It also features a custom low-noise toroidal transformer and advanced feedback topology.
It is possible to bridge it as a mono amplifier with a bridged power rating of 140W @ 8 ohms. Connecting two Quad 303 amplifiers will quickly satisfy even the most demanding loudspeaker, maintaining the iconic design and perfect construction.
The original triple output stage includes an upgraded toroidal transformer capable of driving 4-ohm loads with 70 Watts per channel. It can also be used in bridge mode to output 140 Watts into 8 Ohms.
Pioneering Current Dumping Technology
The idea behind the current dumping of the Quad 303 Power Amplifier is most likely its most remarkable technical accomplishment. The new, untraditional method is that the higher the quality, the smaller the amplifier that delivers the details of the audio signal, and the more significant and less refined.
Premium Power
The Quad 303 Power Amplifier of the old scenario operated with a quasi-complementary output stage since the NPN and PNP power transistors were unavailable then!
The Quad 303 has an entirely complementary output stage, providing better linearity and more static bias stability. Plus, stability even under high voltage and significant current conditions. By leveraging high-performance power transistors. The 303 brings an entirely linear gain that accurately reproduces the input signal, thus enabling a more fantastic dynamic range.
Reliability and Longevity
Building a new and upgraded Quad 303 represents the gold standard of the British audio engineering era. Their publicity for reliability and longevity has left more than Quad 303 amplifiers in use up until today, which shows how durable they are.
Features and Benefits
- Innovative Current Dumping: It enables the transmission of high-quality power for the speakers without any sonic problems. They are devoid of distortion.
- Classic Design: The fact that the design doesn’t get out of fashion may also be a point in its favour.
- Long-Term Reliability: It is known for its long life due to its durability.
- Exceptional Sound Quality: It is famous for the crystal clear sound it makes.
Technical Specifications
- Power Output: 45 watts per channel into 8ฮฉ (stereo)
- Frequency Response: 30Hz to 20kHz
- Total Harmonic Distortion (THD): Less than 0.1%
- Input Sensitivity: 1.3V
- Signal to Noise Ratio: Better than 80dB
- Dimensions: 340mm x 121mm x 165mm
Summary of the Quad 303 Power Amplifier
The new and upgraded Quad 303 Power Amplifier is the benchmark in stereo amplification for the genuinely new perspective it brings to audio amplification. This unique current dumping technology was the first among other innovative amplifier designs.
The Quad 303’s Enduring Legacy
Interestingly, the Quad 303 Power Amplifier has become a prime audio engineering example. A reference in sound quality and simplicity of design. It is a love letter to its creator, Peter Walker, making it a product of its era. The brand stands out as a strong representation of the industry’s willingness to develop more user-friendly and efficient products.
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