The Trilogy 903 combines unmatched sound quality with outstanding control flexibility. The optional integrated phono stage makes this all the preamplifier you could ever need. The audio circuit benefits from Nic Poulson’s years of experience in audio design: his pursuit of transparency and true fidelity results in an elegant solution that reflects the designer’s passion.
The control menu is accessed intuitively via the rotary encoder and the enter and escape buttons. The hierarchical structure is carefully designed to keep all commonly used commands close at hand. Among the many configurable options available to personalise your 903 are display brightness, custom input labels and gain trims for each input, film mode, security bonding, sleep countdown, timed system power-on via TAS link, and remote operation.
The gain stage uses the 6H6П super tube for all voltage gain. This Russian military triode offers high transconductance and low mu, delivering exceptional performance at audio frequencies. The grounded grid configuration allows the tube to operate in pure Class A with maximum linearity and minimum distortion. The output impedance is low for excellent drive capability.
Three transformers supply the power stages. The valve’s high-voltage supply is actively shunt regulated. This topology allows the regulator to both source and sink current, a crucial detail that keeps the supply rail quiet and stable under all conditions, an essential requirement for high-resolution audio.
The optional phono stage is far from a marketing afterthought. It shares much in common with the acclaimed 907, being a Class A design with passive RIAA equalisation. The active circuit is fully discrete, and the onboard shunt regulators have their own dedicated power supply for maximum fidelity. Gain for moving magnet and moving coil cartridges, as well as cartridge resistance and capacitance loading, are all adjustable via the menu hierarchy, either locally or remotely via infrared remote control or the powerful TAS link interface.
The 903 is a product of rare quality, offering both supreme flexibility and peerless construction. Above all, it is the sublime musical performance that secures its place at the very heart of your music system.
Specifications
Size: 465 × 312 × 106 (W × D × H)
Size including connectors: 465 × 350 × 106 (W × D × H)
Packaged Size: 590 × 510 × 250 (W × D × H)
Weight: 10 kg
Packaged Weight: 13 kg
Maximum Power Consumption: 40 W
Inputs: 6 pairs RCA phono sockets
Input Impedance: 50 kΩ
Main Outputs: 2 pairs RCA phono sockets
Send (Tape) Outputs: 1 pair RCA phono sockets
Output Impedance (Main): < 200 Ω
Frequency Response: 2 Hz – 50 kHz ±0.5 dB
Gain (Inputs to Send outputs): 0 dB
Gain (Inputs to Main outputs): 14 dB ±0.5 dB
Film Gain (Inputs to Main outputs): 0 dB ±1 dB
Distortion: Less than 0.05% A-weighted at 1 V output
Phase: Phase correct (non-inverting)
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'The essence of music - engineered'
From a passion to remain true to the essence of music, and by keeping all the key design elements in harmony, we create products of true quality.
Look at the objects around you in your home or work place; the chances are much of what you see is the end result of derivative thinking. By bringing a small improvement to what already exists; a commercial niche is filled and a small advantage over your competitors is gained. Here at Trilogy Audio Systems we do things differently.
Nic Poulson is the principal designer of all Trilogy Audio Systems products.
Nic's background was originally in broadcast engineering, training with the BBC in the eighties. The corporation's legendary high standards made a deep impression on him. He learned that the way to achieve true quality is to strive for excellence in every area and accept nothing less. He went on to found Trilogy in 1990 and quickly earned a reputation for producing designs that reflected his core values of performance, reliability, pride of ownership and value for money.
Nic's designs can also be found in runway lighting systems, guiding aircraft safely to land at major airports across the UK. His success in the exacting industry of aviation is further confirmation of his breadth and versatility as a designer.
After studying in depth the inherent weaknesses in most mains derived power supplies, and their surprising impact on sound quality, Nic founded Isotek and revolutionised the concept of mains conditioning. Now the creative force behind Isol-8 Teknologies, he has delivered award winning designs which display none of the negative qualities shown by previous generations of mains conditioners. His products have taken the audio community by storm and are sold to discerning users worldwide.
His design philosophy is the key to understanding all Trilogy products.
Instead of deciding a price point and assembling a product steering committee chaired by a marketing manager, Nic goes back to first principles: identifying the fundamental questions at the core of each design issue. By carefully addressing and optimising each electrical design element to deliver the optimum solution, his goal of minimum compromise is achieved.
We complement this by taking great care over the realisation of the design. Beauty, reliability and user friendliness are essential qualities that must be present as a design makes its way through the myriad processes that make a physical real world product.
These are the reasons why our designs are enduring. From a passion to remain true to the essence of music, and by keeping all the key design elements in harmony, we create products of true quality.
Several years in the making, the latest generation of Trilogy Audio Systems components remain true to our original core values. Engineered from the inside out with real heart and soul behind them, they will provide lasting satisfaction, making music for your pleasure. We hope you will share the experience with us soon.
![Atoll PR 100 SE Pre-amplifier [2nd hand]](https://www.playstereo.com/img/p/en-default-home_default.jpg)
Used unit, in excellent condition, like new, without original packaging (will be shipped in safe packaging), complete with accessories and remote control, 1 year warranty - Fin. SILVER
B-Stock product, ( read below) in excellent conditions, original box, full warranty.
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![Atoll PR 100 SE Pre-amplifier [2nd hand]](https://www.playstereo.com/25509-home_default/atoll-pr-100-se-pre-amplifier-2nd-hand-.jpg)
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