Soulution
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Complete silence inside. No alternating current. No transformers. No stray fields. Perfect conditions for the multi-stage, low noise amplifier to perform at its absolute best. The height of achievement in phono amplification. An audiophile’s dream that until now had simply not been realized. Now analogue records really can sound their best. Their most captivating ever.

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750 Phono Preamplifier

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 (1 MHz/– 3 dB) 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 (200 KHz) or High (1 MHz) to within – 3 dB. To suppress rumble from warped records there is an IEC subsonic filter (< 20 Hz) which will protect loudspeakers against hazardous cone excursions. On the 750/751 there is also a key to select mono operation.

750 Phono Preamplifier

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 1 MHz/– 3 dB). 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 40 MHz (– 3 dB), ensuring every musical detail is reproduced true to life. The result is a three-dimensional, spatial sound of uncanny accuracy and detail.

750 Phono Preamplifier

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.

Mains 220 – 240 V / 50 – 60 Hz
Model 100 – 120 V / 50 - 60 Hz
Power consumption < 0.5 W standby
60 W device in operation

Main Out
Output voltage 4 VRMS balanced
2 VRMS unbalanced
Peak Output Current 1 A
Output impedance 2 Ω balanced
2 Ω unbalanced
Frequency response DC-100 kHz (depending on data format)
Distortion (THD) < 0.002%
Signal to noise ratio (SNR) 140 dB

Digital-Out
Output voltage SPDIF
AES/EBU X
500 mV p-p
5 V p-p
Output impedance SPDIF
AES/EBU
75 Ω
110 Ω
Frequency 32 – 192 kHz
Resolution 16 – 24 bit

Digital-In
Sensitivity 0.3 - 5 V p-p
Input impedance SPDIF
AES/EBU
75 Ω
110 Ω
Frequency 32 -192 kHz
Resolution 16 – 24 bit
PLL – range +/- 100 ppm

Clock-Output
Output voltage 5 V p-p
Output impedance 75 Ω
Clock-frequency (adjustable) 44.1 or 48 kHz

Clock-Input
Input voltage 0.3 – 5 V p-p
Input impedance 75 oder 300 Ω
LINK-System + 12 V

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