Cambridge Audio 551P Moving Magnet (MM) Phono Pre-amplifier

Cambridge Audio

Out of stock

Most hi-fi amplifiers won’t let you plug in a turntable directly. You need to connect via a phono stage (also known as a phono pre-amp) to make the very quiet signal from the turntable powerful enough for your main amp to work with.
  • Input impedance: 47kOhm
  • Dimensions: 46 x 215 x 133mm
  • Weight: 0.8Kg (1.8lbs)
  • Input capacitance: 220pF
  • Nominal output: 300mV


Out of stock

But it’s very easy to add noise at this stage, which is why our audio-obsessed engineers carefully designed the 551P using hand-picked components chosen to amplify the signal without distorting it or introducing noise. They’ve fine-tuned every element to perfect the performance, creating a state-of-the-art phono pre-amp.

In fact, the 551P does its job with such finesse that, even if your amplifier does have a built-in phono stage, bypassing it using the 551P is guaranteed to deliver much greater depth and detail of audio. Vinyl lovers will instantly hear the difference that the dedicated 551P makes to music quality.

The 551P works with all popular turntables that use a Moving Magnet cartridge (the stylus or needle). For a high-end audiophile turntable with a Moving Coil, cartridge sees the Azur 651P premium phono stage which works with both types.

To those who wrote off vinyl as dead, we say “nonsense”! Vinyl is once again rightly growing in popularity for the audio quality and particular warmth it can deliver. The Azur 551P, developed in London by our team of music-loving perfectionists, truly makes the most of your vinyl.


  • Phono pre-amplifier with moving magnet (MM) input stage
  • Acoustically damped full metal chassis with thick brushed aluminium front panel
  • Discrete transistors for the all-important input stages instead of the more common integrated circuits
  • Single-ended, ‘Class A’ gain stage with audiophile passive RIAA equalization
  • Eco-friendly <1W Standby power consumption
  • Available in black and silver finishes
SKU: 551P Category:
Weight 800 g
Dimensions 133 × 215 × 48 mm

  • Max power consumption: 5W
  • Gain @ 1kHz: 39dB
  • Input impedance: 47kOhm
  • Input capacitance: 220pF
  • Nominal output: 300mV
  • Sensitivity for nominal output: 3.35mV
  • Overload margin: >30dB
  • THD 20Hz – 20kHz: <0.009%
  • RIAA curve accuracy: < +/-0.65dB, 25Hz-20kHz
  • Signal to noise ratio: >85dB (using Audio Precision RIAA-1 with grounded inputs)
  • Crosstalk @ 20kHz: >76dB
  • Dimensions: 46 x 215 x 133mm (1.8 x 8.5 x 5.2”)
  • Weight: 0.8Kg (1.8lbs)