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Boxed Weight: 1.2 Kg
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Delivery Restrictions: None
On Demonstration?: Yes - Call us to arrange
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Product Information
The Solo Ultra Linear Headphone Amplifier reproduces music so precisely it naturally sounds musical.
A best selling headphone amplifier that takes all the good points of valves/tubes, but won't wear out like valves/tubes and drives low impedance headphones too!
Whilst other headphone amplifiers follow a one-way trend, the Solo Ultra Linear headphone amplifier is original thinking. It's far less coloured - if it can be called coloured at all - it reproduces music so precisely it naturally sounds musical!
The Solo Ultra Linear headphone amplifier lets the music flow - it's timing is second to none. The bass is full but never loses control. The highs are free of grain and harshness. Stereo imaging is the best it can be without artificial cross-mix or width extension. Made for the best signal sources - the Solo Ultra-Linear headphone amplifier will be your best headphone amplifier purchase yet.
Technically Speaking
The Solo Ultra Linear headphone amplifier is a J-FET input - discrete transistor output-stage design which uses open-loop gain and bandwidth modified operational amplifiers that mimic valve/tube performance. The result is linearity in all areas that can only normally be provided by valves/tubes. However, the Solo Ultra-Linear headphone amplifier can directly drive low impedance headphones - as low as 5 Ohms - as well as high impedance headphones.
It also includes our proprietary headphone load feedback network which cancels much of the Solo Ultra-Linear current drive output impedance as well as controlling headphone cable capacitance and inductance so you should never need a cable swap to hear your headphones at their best.
The headphone load feedback network also makes it possible to swap from high to low or low to high impedance headphones without much change in volume control position or the need for a gain switch which could otherwise colour further the music.
Please note: The Ultra-Linear technology mimics valves so closely that there is also a similar amount of the valve artefact "hiss". Although this will not be a problem for most listeners because it is no louder than or different to what you'd get from actual valves, if your preference is for the utmost background silence then Graham Slee recommends the Solo SRGII which is more than half as quiet.
Connection Suggestion
The Solo can be connected in an amplifier tape-loop as shown here.
An extra pair of interconnects are required as well as two phono tee-adapters inserted where indicated by the asterisks shown in the diagram.
When connected as per this suggestion, the input selector on the Solo front panel mimics a tape monitor switch. In position 1, the same source as selected on the amplifier is fed to the Solo; in position 2, the output from the tape recorder (or other recording device) is fed to the Solo.
The Graham Slee Solo Ultra-Linear comes with the Graham Slee PSU 1 Power supply as standard.
Solo Ultra-Linear Headphone Amplifier Specification
- Headphone impedance range: 8 to 2,000 Ohms / 16 to 600 Ohms preferred
- Power output: (rms, both channels fully driven at 1% THD)
- 32 Ohms: 140mW/channel; 600 Ohms: 30mW/channel
- Input sensitivity (for specified power output into 32 Ohms): 511mV rms
- Input impedance: 37k Ohms at max volume; 50k Ohms at min volume
- Distortion: (THD plus noise at 9 o'clock volume control setting (qtr power))
- 10Hz-20kHz: better than 0.04%; 10Hz-1kHz: better than 0.02%
- Frequency response (±0,-3dB) 10Hz - 35kHz
- Output noise: (22Hz-22kHz, quasi-peak/un-weighted) -78dB
- Channel balance: better than 1dB
- Crosstalk: Left to Right -56dB; Input to Input -68dB
- Input selector centre-off position: non-shorting; -38dB at max volume with 2V rms input (ref: 1kHz and 10kHz)
- Output Stage: Bipolar class AB
- Supply voltage: 24V DC unipolar
- Size: (approx.) W: 107 x H: 50 x D: 185 (mm) inc. controls
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