Audio Research SP-11 Preamplifier - SALE ON HOLD

Audio Research SP-11 Preamplifier – SALE ON HOLD

Legendary Hybrid Tube / FET ,Preamplifier dual-chassis with phono preamplifier

MSRP

MSRP was $4900 for this Preamp.

We are asking $2000, OBO. (Audiogon ave. price is $2117)

We would like to sell it with the pair of M-100 Audio Research monos we have for sale.

About this Item: We are selling the Vintage Audio Research legendary hybrid vacuum tube & Field Effect Transisitors (FET) SP-11 preamplifier. The two piece preamp is in great condition and has been tested in our showroom. Listing includes almost all original packaging (though the boxes are a little crusty). Local pickup is available.

We played this 2 piece preamp matched with the Audio Research M-100 tube monoblock amplifiers and it was quite awesome sounding. Solid bass, big soundstage, excellent imaging and dynamic range.

Content below from Audio Research database website archives:

Link to archive page at Audio Research database website.

The SP11 is a hybrid unit, utilizing both vacuum tubes and Field Effect Transistors (FETs). It is not intended that this product should somehow continue the controversy of “vacuum tubes” vs. “solid-state.” Rather, in keeping with Audio Research’s design philosophy of advancing the state-of-the-art, each type of device is used where it performs best.

DETAILS

TYPE

Hybrid stereo preamplifier with phono stage

INTRODUCED

1985

OPTIONS

–

MSRP (US NEW RETAIL)

SP-11: $4,900

REVIEWS

the absolute sound
Issue 40&45 (SP-11: Full Review)

Issue 41 (SP-11: Update)

Issue 43 (SP-11: Special Report)

Issue 47 (SP-11 Revised: Editor’s Choice)

Issue 50 (SP-11: Capsule, SP-11

Vol. 9 No. 4 (SP-11)

Vol. 9 No. 7 (SP-11)

SPECIFICATIONS

FREQUENCY RESPONSE

High level input: ±1dB 0.2Hz to 100kHz. -3dB below 0.1Hz and above 200kHz. Phono input: ±.2dB of RIAA 20Hz to 40kHz. ±1dB of RIAA 1.0Hz to 100kHz.

DISTORTION (THD)

Harmonic distortion: Less than .005% at 2V RMS output, 5Hz to 20kHz (Typically less than .001% at midband, phono or line input). Intermodulation distortion: Less than .003% at 2V RMS output

NOISE & HUM

IHF weighted, shorted input: Output (Gain down): 6µV (110dB below rated output). Input (High level): 3µV equivalent input (110dB below 1V input). Phono: 0.15µV equivalent input (76dB below 1mV input)

GAIN

At 1kHz, bypass mode: Phono input to tape output: 46dB (0.2V output from 1mV input). Phono input to main output: 75dB (0.175mV input for 1V output). High level input to main output: 29dB (36mV input for 1V output).

INPUT IMPEDANCE

Phono: Front panel selectable 47K, 100, 30, 10, 3 ohms. Phono input capacitance: 150 pF at 10kHz. High level: 20K ohms or higher, depending on switch functions.

OUTPUT IMPEDANCE

250 ohms main, direct, inverted outputs. 500 ohms tape output. Recommended load 60K ohms and 100pF (20Kohms minimum, 1000pF maximum)

OUTPUT POLARITY

Tape outputs, direct output: Non-inverting. Invert output: Inverting. Main outputs (2): Selectable non-inverting or inverting. All outputs may be used simultaneously.

MAXIMUM INPUTS

Phono: 350 mV RMS at 1kHz, 1200 mV RMS at 10kHz (0.1 second maximum duration, 6dB less if continuous). High level: 25V RMS.

RATED OUTPUTS

2V RMS 1Hz to 100kHz main, direct, inverted outputs. (Maximum 80V RMS at 0.2% THD at 1kHz into 60kOhm load with 2.85V RMS high level input).

POWER SUPPLIES

–

TUBE COMPLEMENT

(6) 6DJ8/ECC88

POWER REQUIREMENTS

95-135VAC 60Hz, 190-270VAC 50/60Hz, 130 Watts maximum

OTHER

Filter: 25Hz Hi-pass phono subsonic 6dB/octave rolloff (to eliminate ringing) with transition to 12dB/octave at 10Hz. Front panel switchable phono only. Controls (6): Gain, Level (to set gain range), Balance, Mode, Input, Impedance. Switches (8): Tape monitor, Copy, Tape 1/2, Tape 1to2 / 2to1, Mute, Invert phase, Bypass, Filter.

DIMENSIONS

(Each chassis, EIA Rack panel mounting) 19″ (48 cm) W x 5 ¼” (13.4 cm) H x 10 ¼” (26 cm) D. Handles extend 1 ⅝” (4.1 cm) forward of panel. Interconnect cable extends 4″ behind rear of chassis.

WEIGHT

SP-11: 14 lbs. (6.4 kg) Net, 23 lbs. (10.5 kg) Shipping. SP-11PS: 15 lbs. (6.8 kg) Net, 23 lbs. (10.5 kg) Shipping. Total: 29 lbs. (13.2 kg) Net, 46 lbs. (21.0 kg) Shipping.