Graham Slee Accession
MM Phono Preamp With Volume Control
The Graham Slee Accession stereo phono stage preamplifier uses a different kind of 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.
Keeping Interference Out
The Accession 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.
- 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: 100pf, 220pf, 320pf and “out”
- Input and output connectors: 360° shielded RCA/phono sockets, hard gold plated
- Input sensitivity range: 1.6mV to 7.2mV (recommended)
- Output range (for above inputs): 190mV to 857mV
- Maximum input: 35mV rms
- Maximum output: 5.2V rms
- Gain: 41.5dB (119) at 1kHz
- Input impedance: 47k Ohms plus: 100pF, 220pf, 320pf and out
- Output impedance (driving impedance): 750 Ohm fixed, 470 Ohm variable (will drive 10k Ohms and above)
- Noise at output: -66dB Quasi-peak 20Hz to 20kHz
- Distortion: typically 0.01% 20Hz to 20kHz
- RIAA accuracy: ± 0.3dB
- Frequency response: <20Hz – 45kHz (-3dB corrected to RIAA)
- Channel balance: 0.2dB
- Channel separation: 60dB
- Power supply: remotely powered using PSU1 linear power supply
- Size: W 107 x H 50 x D 195 (mm) including jacks
Graham Slee Elevator EXP
MC Step-up Amplifier
The Elevator EXP will give you hum-free sound, purer bass, greater definition and much more of your music. In the beginning you’d buy a step up transformer (S.U.T.) to be able to use a moving coil cartridge. But they hummed and did weird things to the bass. The Elevator EXP changes all that.
The Elevator EXP is designed to step-up the tiny moving coil signal to the moving magnet level of a hi-fi phono amp input.
Whereas some moving coil cartridges will happily give their best with 100 Ω loading, others can be quite particular. Rather than fiddling around with links or DIP switches, the Elevator EXP gives you all its loading options up front, right there on the front panel – making it easy to get your sound right.
The Differences Between The Elevator EXP And S.U.T.s
For a start, the Elevator EXP doesn’t hum. Transformers do. To be correct, the transformer itself doesn’t hum, but the magnetic surrounding fields easily get induced into it. These magnetic fields are predominantly mains-borne. There are a number of hum sources including all your mains powered equipment, surrounding mains powered products, and even the wiring you see, and the house wiring you don’t see – all emitting magnetic fields by differing amounts. The SUT, being a transformer, is influenced by them all. The result is hum. No matter how well shielded its case or how well you carefully position it, in most cases that isn’t very successful. The Elevator EXP is an amplifier – it doesn’t contain a transformer so it’s harder for hum to be induced into it.
Bass frequencies are the lowest audio frequencies, below which everything becomes DC or direct current. DC doesn’t commutate from positive to negative – it doesn’t ‘cycle’ – so it cannot be transformed. Low bass frequencies to a transformer move so slow that they’re ‘almost DC’, As a result transformers distort most of all at low frequencies. All sorts of tricks and adjustments are employed to reduce this distortion – many include the use of expensive metals and labour intensive winding techniques in a bid to overcome the bass distortion. This is why good S.U.T.s are so expensive.
But the distortion is never really overcome and in the place of detailed bass, all the transformer can really do is ‘fudge’ the sound. You might have heard people refer to the bass they get as a ‘smooth chocolatey sound’? I suppose that’s similar to fudge… The electronics of the Elevator EXP however, don’t cause anywhere near such levels of distortion, so all the bass details – the layering and the timbre (the characteristic sound of an instrument or voice) is there to be heard and enjoyed.
All transformers require excitation current before they will pass any signal. Where do you think the S.U.T. gets its excitation current from? Has it a power supply? No. So obviously it uses some of the signal as excitation current. That would be OK but for the fact that magnetic cartridges don’t have a linear response – their bass is much weaker than the highs, and so more is ‘stolen’ from the lows. That’s the reason you’ll often see additional components inside a S.U.T.’s casing – these being used to straighten-out the frequency response.
Suitable Cartridges – Low output moving coil (MC) with output in the region of 0.15 – 0.8 mV (ref 1kHz at 5cm/sec).
- Input range: 0.15mV to 0.8mV
- Output (for input range): 2mV to 10mV, suitable for a moving magnet phono stage input
- Maximum input: 378mV rms (a very large overload margin)
- Maximum output: 4.914V rms
- Gain: 22dB (13) < 10Hz to 917kHz (-3dB points)
- Input impedance: 23, 30, 100, 840, 1000, 5100 and 47000 Ohms
- Output (driving/source) impedance: 300 Ohm
- Recommended load impedance: 47k Ohms phono stage preamp input
- Noise at output: -99dB CCIR Q-pk
- Distortion: 0.02%
- Frequency response: < 10Hz to 917kHz (-3dB points)
- Channel balance: 0.2dB
- Channel separation: 64dB
- Size: W 107 x H 50 x D 180 (mm) including jacks
Last But Not Least
These Graham Slee units are ready to go, plug and play so to speak as long as you have a turntable of course. We have it on display and can be auditioned with only a few moments notice, but a bit of advance warning would be handy, just in case we are up to our necks with another audition.
Both units are in excellent condition. the only real issue is one is silver and one is black!! but hey we can’t have everything. We have the original boxes along with paperwork and both PSU1 Linear power supplies.
Pricing is for Both units.
To have a look at another of our pre owned units try Torus
To view other phono stages in our line up try Clearaudio
For a review head over to Positive Feedback