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Audio Research SP20 Stereo Valve Preamplifier

code: AUDIORESSP20
£8,300.00 (FREE UK Delivery)
Item out of Stock  |  Usually dispatched within 24 hours
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This item cannot be ordered online. If you are interested please click on the Ask a Question button below.

Influenced by some of their classic groundbreaking SP preamplifiers, the SP20 takes visual cues from past Audio Research products while incorporating their latest designs and technologies. The SP20 is a full-function line stage which incorporates a phono preamplifier and, for the first time ever on an Audio Research preamp, there is a ¼" headphone jack. Front panel controls have been minimized to two rotary controls and an interactive touch screen display, along with power, mute and output selector buttons.

This item cannot be ordered online. If you are interested please click on the Ask a Question button below.

The interactive touchscreen has been designed to take full advantage of the feature set the SP20 offers, and operation is intuitive and easy-to-use. Numerous adjustments allows customization to the performance and display of the SP20 for seamless system integration, including input naming and gain offsets, volume presets, and tube hours. System checks have been put into place to alert when tubes have exceeded standard serviceable hours (4,000), and a low line auto mute function engages in the event of a power brown-out.

The SP20 is fully balanced, pure Class-A with zero feedback. There are seven levels of voltage regulation, a large power supply, and a very low-noise R-core power transformer. Both the line and phono stages feature low-noise JFET inputs and 6H30 (2 per section) outputs. The latest high performance coupling and bypass capacitors are used in both stages. Both the line stage and phono preamplifier offer extraordinary frequency response and low noise. The phono section provides 58dB of gain, so the SP20 can be used with a wide variety of phono cartridges, including moderately low output moving coils.

The headphone output is no mere afterthought; it is a low-distortion, high-performance vacuum-tube headphone amplifier designed to comfortably drive a wide impedance range of headphones. The button next to the headphone jack switches off the main (amplifier) outputs for headphone listening, or it switches off the headphone jack for speaker listening.

All of these developments would be for naught if the SP20 did not delight sonically, which it does with ease. The presentation is so relaxed and natural, transparent and solid with great dynamics and impact. Never threadbare, sonic images have texture and a luminous 3-D quality. The SP20 delivers musically, with an ability to effortlessly drive your tube or solid-state amplifier.

Technical Specification:

Frequency Response

 

  • Line: +/- 3dB 2 Hz to 80 kHz; -3dB 0.8Hz to 220 kHz 
  • Phono: +/- 0.1dB of RIAA 10Hz to 20kHz; +/- 0.4dB 5Hz to 80kHz 
  • Headphone: +/- 0.05dB 20Hz to 20kHz; -3dB 0.8Hz to 220kHz

 

THD+N

 

  • Line: <.003% at 2V RMS, Bal output 
  • Phono: <.005% at 3V RMS output, to Record output
  • Headphone: <.009% at 1V RMS output

 

Gain

 

  • Line: 13.8dB, Processor: 0dB
  • Phono: 58dB @ 1KHz to Record output
  • Headphone: 11.3dB

 

Noise

  • Line: <-101dBV volume at max.
  • Phono: <-77dBV to Record output 
  • Headphone: <-88dBV volume at max

Channel Separation

  • Line: > 105dB Balanced output
  • Phono: >76dB to Record output
  • Headphone: >62dB

Signal To Noise Ratio

  • Line: >125dB Balanced output
  • Phono: >94dB to Record output
  • Headphone: >110dB

Rated Outputs

  • Line: 2V RMS (1V RMS SE) into 200k ohms balanced load (maximum balanced output capability is 18V RMS at less than .5% THD+N at 1kHz.)
  • Phono: 0.5V RMS into 100k load at Record output (maximum output capability is 25V RMS)
  • Headphone: 6V RMS maximum into 30 to 300 ohm load

Input Impedance

  • 120k ohms Balanced, 60k ohms SE; Phono impedance programmable (100, 200, 500, 1000 or 47k ohms w/200pf unbalanced)

Output Impedance

  • 500 ohms Balanced, 250 ohms SE; 1000 ohms Record Out SE; <.05 ohms Headphone SE

Output Polarity

  • Non-inverting

Maximum Input Line

  • 19V RMS Balanced, 9V RMS SE. Phono: 70mV RMS at 1kHz

Controls

  • Rotary Volume (104 steps), Rotary Input selector. Push 

Buttons

  • Power, Mute, SPKR Off. Interactive Touch Screen. Rear RS-232 control and Remote IR input

Power Suplies

  • Electronically regulated low and high voltage supplies. Automatic 30 sec. warm-up/brown-out mute. Line regulation better than .01%

Tube Complement

  • 4 6H30 dual triode

Power Requirements

  • 100 - 135VAC 60Hz (200 - 270VAC 50/60Hz) 77 watts maximum. Standby 2.7 watts

Dimensions

  • Width 19" (48 cm) 
  • Height 5.25"(13.4 cm) (standard rack panel) 
  • Depth 16.5"(42 cm) D

Weight

  • 17.8 lbs. (7.4 kg) Net;
  • 27.8 lbs. (10.5 kg) Shipping

We endeavour to despatch same day (for orders placed up to 2pm) on available stock items to the vast majority of UK mainland addresses. Please remember to check with us first for a physical stock check if next day delivery is important to you.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Free delivery also applies to the Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland but may take a day or so longer. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Hifisound or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

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