Graham Slee Accession MM Moving Magnet Phono Stage

Description

Accession MM

The Accession MM stereo phono stage preamplifier uses patented technology which reveals much more musical detail and goes even further in relegating vinyl’s bad points.

It has some really useful features too – fixed or variable output levels – front panel volume control – selectable EQ settings – and more. The impeccable sound of the Accession stereo phono stage preamp takes music from vinyl and sets it on a new higher pedestal – it’s what all vinyl lovers will want to hear.

Previously overlooked technology has been perfected to extract much more of what’s hidden in the music on vinyl records. The resulting sound from the Accession hi-fi phono stage preamp is considerably closer to the music laid down at its recording.

Keeps Interference Out

The Accession MM goes further than ever in keeping interference out: it has a solid ground plane board, multiple layers of radio frequency filtering, high immunity design, and the V2 casework has stainless steel gaskets behind front and rear panels, which seal against electromagnetic disturbances – they provide conductive shielding in contact with board grounds which anodised aluminium panels alone cannot do.

Minimalist System Volume Control

Not only is the volume control and buffer stage of use for digitizing vinyl, but it’s the answer for those who only want to play vinyl and want the bare minimum of system components.

All that is required is a reasonably sensitive power amp for the Accession MM to drive. Partner it with a pair of decent mono-blocks and any cartridge outputting greater than 4.5 mV (ref 1 kHz @ 5 cm/sec) will be sufficient to reach high volumes with excellent sound quality.

The output buffer stage of Accession MM was developed specifically to prevent input saturation from ruining the clean signal from the phono preamp section. It handles the full post EQ peak to peak signal without any slew-rate limiting.

Cartridge Loading

Not that it should be needed, because in Graham Slee’s opinion 100 pf is ideal for the vast majority of MM cartridges when combined with the 50 pf – 100 pf of arm and cable capacitance. But as the Accession MM is made as a tool to extract maximum information from vinyl records, Graham Slee have included four capacitive load settings for you to experiment with.

The effect on sound will be to take the high frequency peak in the 10 kHz – 20 kHz region lower or higher, making the peak larger or none existent, between the maximum loading and minimum loading, respectively.

What About MC Catridges?

Accession MM is designed for high output MM cartridges, but if you want to use low-output MC too, partner it with the Graham Slee Elevator EXP Step-Up for an unbeatable all-cartridge phono preamp combo. You could also choose the Accession MC model designed specially for MC cartridges.

Features

• Adjustable and fixed level outputs.
• Volume / output level control.
• RIAA, NAB (American) and FFRR (British) vinyl record EQ’s.
• Flat / CA (constant amplitude) alternative EQ.
• Mono / stereo switch.
• Four cartridge capacitive loading options: 100 pf / 220 pf / 320 pf / Out.

Specifications

• Input / Output Connectors: 360-degree shielded RCA / phono sockets, hard gold plated.
• Input Sensitivity: 1.6 mV to 7.2 mV (recommended)
• Output Range (for above inputs): 190 mV to 857 mV
• Maximum Input: 35 mV rms
• Maximum Output: 5.2V rms
• Gain: 41.5 dB (119) @ 1 kHz
• Input Impedance: 47 k Ohms, plus 100 pF / 220 pf / 320 pf / out
• Output Impedance (Driving Impedance): 750 Ohm fixed / 470 Ohm variable (will drive 10 kOhms and above)
• Noise At Output: -66 dB Quasi-peak 20 Hz to 20 kHz
• Distortion: Typically 0.01 %, 20 Hz to 20 kHz
• RIAA Accuracy: ±0.3 dB
• Frequency Response: >20 Hz – 45 kHz (-3 dB corrected to RIAA)
• Channel Balance: 0.2 dB
• Channel Separation: 60 dB
• Power Supply: Remotely powered using PSU1 linear power supply.
• Size (WxHxD): 107 x 50 x 195 mm inc. jacks.

Included

• 1 x Accession MM.
• 1 x PSU1 Power Supply.

Full Graham Slee Range Available

Unilet Sound & Vision are official retail partners for Graham Slee, providing sales, advice and assistance on their entire range of high-quality products. Please do get in touch if you would like a demonstration or wish to purchase.

More Information

• Accession MM Phono Stage, by Graham Slee

Additional information

Brand

Graham Slee

Graham Slee are Graham, John and Leo, who got together to bring you essential technology for outstanding music reproduction. Graham & John designed and built broadcast audio equipment at Audionics-Sheffield in the 90's, whilst Leo was quality control engineer at Carlsbro Sound. Together trusted to bring quality sound to millions of listeners, the trio have been making their own great-sounding products for the last twenty years.

Graham Slee products are designed to give customers the best listening pleasure available; better than all the rest at (and beyond) their price-points. This is the company mission, one that continues to push at the scientific boundaries of the art.