It is easy to overlook what mature technologies can still offer amidst all the clamour of the digital revolution. Vinyl's appeal as a medium of the highest quality still rightfully endures, despite today's convenience-led music market.
The Trilogy 907 Phono Stage has been meticulously designed to be the perfect interface between your turntable and high resolution amplifier.
The compact enclosure for the active circuitry is machined from a solid billet of aluminium. It's 1.5kg mass provides outstanding physical and electrical isolation for each of the circuit elements. Even the DC from the power supply runs through its own channel within the housing, until L-C filtering takes place before the main power regulators.
The commonly used series regulator, usually chosen for its lower power dissipation and simplicity, has been rejected in favour of discrete shunt regulators. They are biased heavily into Class A with plenty of voltage headroom to provide ample current for the active gain stages.
The key feature of shunt regulators is their ability to sink, as well as source current. This gives a clear performance advantage under the dynamic operating conditions music demands.
The DC for the regulators is derived from a separate power supply housed in a brushed stainless steel enclosure. This can be placed remotely to keep any magnetic fields well away from the sensitive active circuitry. The custom mains transformer is designed with a low operating current density and a copper faraday screen. It feeds the main Mundorf reservoir capacitors through a bespoke inductor, forming a true choke input supply for absolute minimum electrical noise.
Each channel has its independently housed and isolated gain stage. The fully discrete topology is single ended; achieving high bandwidth and low distortion through the use of active current sources and cascode gain blocks. Precision matched input transistor pairs ensure low noise.
The circuit performance is such that global feedback is not needed. RIAA equalisation is passive, carefully optimized with precision components. Gain settings for MM or MC and cartridge loading are easily achieved via configuration switches on the base.
|Size (907 Pre amplifier)||150*220*38 (W*D*H)|
|Size including connectors (907 Pre amplifier)||150*235*38 (W*D*H)|
|Weight (907 Pre amplifier)||2.0 Kg|
|Size (PSU)||132*225*57 (W*D*H)|
|Weight (PSU)||2.85 Kg|
|Packaged Size (combined)||330*290*195|
|Packaged Weight (combined)||5.9 Kg|
|Power consumption||10 Watts|
|Inputs||2 RCA phono sockets|
|Input Impedance||47KOhms (user adjustable)|
|Input Capacitance||100pF (user adjustable)|
|Gain||50dB, 64dB or 70dB (user adjustable)|
|Frequency response (to RIAA curve)||20-20KHz +/- 0.25dB|
|Output impedance||150 Ohms|
|Phase||Phase correct (non inverting)|