750 Phono

Soulution

DESCRIPCIÓN

Philosophy Building the ideal phono amplifier is the ultimate challenge for audio designers. It must work with the extremely low signal levels of moving coil (MC) cartridges while achieving low noise, low distortion, high channel separation and maximum linearity. It must provide up to 80dB gain - equivalent to raising the signal level by 10,000 - yet must exhibit level and phase accurate behaviour while adhering strictly to RIAA-IEC equalisation standards. Design The soulution 750 (three MC inputs) and 751 (two MC inputs, one MM input) have risen to this design challenge supremely well. Based on an advanced design around an ultra wide band (1MHz/-3dB) multi-stage amplifier, both are built with the very highest quality components. For all inputs the gain factor and the terminating impedance are freely selectable. The working bandwidth may also be chosen from either Low (200KHz) or High (1MHz) to within -3dB. To suppress rumble from warped records there is an IEC subsonic filter (<20Hz) which will protect loudspeakers against hazardous cone excursions. On the 750/751 there is also a key to select mono operation. A front panel level control allows sound level balancing across the three inputs. Phono module (equaliser) The challenges to the ideal phono amplifier are immense and represent the «pièce de réstistance» for every designer of high-class audio amplifiers. With a gain of up to 80 dB (which equals an amplification factor of 10,000) the amplifier is expected to show a level and phase true behaviour, i.e. an ultra wideband quality (internal amplifier bandwidth 1MHz/-3dB). At the same time it is to compensate the equalisation curve in accordance with RIAA-IEC standards. This can only be realised by means of a multi-stage amplifier concept using super-grade components. Output stage The output stage of the 750/751 is optimized for velocity, precision and current capability thus ensuring all the musical detail is passed to attached pre/amplifiers. Furthermore it is stable with interconnects of any length and has a bandwidth that extends to 40MHz (-3dB), ensuring every musical detail is reproduced true to life. The result is a three-dimensional, spatial sound of uncanny accuracy and detail. Power supply Above all a phono amplifier needs an electrically quiet environment. To eliminate any chance of interference from the power supply, the 750/751 is powered entirely by either pure DC from an associated 720/721 preamplifier or from a dedicated soulution external supply. This removes any AC mains voltages or stray magnetic fields. Operation Input selection 3 selected by front panel switch Gain Two switchable settings (+60dB/+54dB) Highpass Selectable RIAA-IEC high pass filter Mono The two channels are combined into a mono output signal Bandwidth The bandwidth may be individually set for each input. Attenuation Balances levels between different sources Terminating impedance The impedance of each inputs can be set to correctly match sources: - MC inputsPDF - MM inputsPDF Connectors 750 751 Analogue outputs: - balanced outpu t(XLR) 1 1 - unbalanced output (RCA) 1 1 Analogue inputs: - MC-Input (RCA) 3 2 - MM-Input (RCA) - 1 - Ground 3 3 Power supply: : - DC-In (for connection to 720/721 or 750PSU) • • - LINK-Verbindung • •

Fast Fourier Transfer (FFT) analysis Ideal conditions for the amplification of weak signals like froman MC or MM pickup system. Distortions can hardly be detected in the 750 phono preamplifier. Noisefloor With approx. -110dBr and a maximum gain factor of 60dB the measurable inherent noise of the 750 phono preamp is touching the limit of technical feasibility. Consumption 19 W Standby consumption <0.5 W Amplification +54/+60 dB Amplification bandwidth Bdw=High DC - 1 MHz Bdw=Low DC - 200 MHz Output voltage balanced 7 Vrms unbalanced 3.5 Vrms Peak output current 0.2 A Output impedance balanced 10 Ω unbalanced 10 Ω Frequency response DC-100 kHz Slew rate 400 ns Distortion (THD+N) <0.006 % Signal to noise ratio (SNR) >100 dB Crosstalk > 60 dB Input impedance adjustable Dimensions (width × depth × height) 480×450×117 mm Weight ca. 17 kg

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