Rothwell Simplex MM Phonostage
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Rothwell Simplex MM Phonostage

  (3 Reviews)

Rothwell's new MM phono amplifier

£249.17 Exc. VAT |  |

Rothwell Simplex MM Phonostage

The Simplex is a moving magnet phono pre-amp compatible with moving magnet and high output moving coil cartridges, giving superb performance. It uses the same class A discrete transistor circuit topology employed so successfully in the Rialto, but without the Rialto's extra moving coil gain stage. The result is truly audiophile performance in a simple, compact and affordable unit, rivaling phonostages at many times the price.

An elegant discrete transistor design rather than the more common op-amp circuit is at the heart of the simplex, operating in class A and using local feedback rather than global feedback to ensure high linearity, wide bandwidth and low noise. The Simplex is the product of over twenty years of phonostage design experience, this inherently simple circuit is one which sounds detailed, spacious and musical. When the music gets busy and complex, the Simplex always reveals all the individual strands of the music and never sounds confused or harsh.

Accurate RIAA equalisation to within 0.5dB is achieved by combining multiple audiophile polypropylene capacitors. Using several capacitors where a single capacitor is more usually employed in lesser phonostages not only achieves greater accuracy but has the added benefit that the capacitors act as mutual bypasses for each other, minimising the dissipation factor and the effects of parasitic elements such as dielectric absorption.

Noise is minimised and signal integrity preserved by careful track routing on the printed circuit board, with star earthing and the use of components on both sides of the board to achieve a compact circuit with minimum loop area for low inductance. The resulting eerily quiet circuit has noise levels way below the surface noise and vinyl roar of even the best pressings, allowing the listener to enjoy recordings without the distraction of electronic circuit noise or other intrusions such as hum or buzz. Multiple stages of power supply filtering ensure that power supply noise is eliminated, and having the power supply in an external unit well away from the audio circuit prevents direct cross coupling of noise..

input impedance
output impedance
sensitivity for 500mV o/p
power supply
mains voltage
power consumption
packed weigh
47k + 150pF
4mV @ 1kHz
>87dB (mm)
24 volts DC, center +ve
100V - 250V AC
60 x 155 x 92 mm
570g (exc. psu)
770g (inc. psu)


Average Rating (3 Reviews):  
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27 July 2023  | 

I have one of these and use it with a Rega P2, and a very good phono preamp it is too. I had the opportunity to hear it along side the much fancied MOFI, which I was also interested in.
On listening, I’d say that the Rothwell had a low noise floor and a broad soundstage. The sound was in my opinion, fuller and more natural / neutral than the MOFI.
British HIFI brands like Arcam and Rega for example, get a lot of plaudits, and I believe Rothwell is up there with them. and people deserve to know!

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1 of 1 people found this review helpful.

Rothwell Audio Simplex
29 May 2022  | 

Very quiet... Possibly the quietest phono stage I've ever used. Dynamic and transparent sound, solid bass with very good grip. No unnecessary gimmicks, just sound! Excellent product made in UK!

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2 of 2 people found this review helpful.

Simply outstanding
04 March 2022  | 

So happy I found Rothwell, which I consider the best AND best value phonostage out there for sensible, high quality audiophile listening. To me the sound is balanced, detailed, organic; nothing synthetic here and it integrates with Rothwell SUTs and interconnects perfectly. I consider Rothwell the “secret king” of British audio engineering, I wish more people would but their stuff

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7 of 7 people found this review helpful.

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