Audio ResearchSP-9 mkIIIusedAudio Research SP-9 mkIIIGreat hybrid preamp with tremendous phono section. Original owner. Rated 8/10 for age only. Frequency response High Level Section: ±.5dB, 5 Hz to 50 kHz, - 3dB points below...1250.00

Audio Research SP-9 mkIII [Expired]


no longer for sale

Great hybrid preamp with tremendous phono section.  Original owner.  Rated 8/10 for age only. 



Frequency
response




High Level Section: ±.5dB, 5 Hz to
50 kHz, - 3dB points below 1 Hz and above 200kHz.








Phono: ±.3dB of RIAA, 30Hz to
40kHz.






Distortion
(THD)




Less than 0.1% at 2V RMS output.
(Typically less than 0.005% in midband)

(SP-9: < .01% @ 2V RMS output 10Hz to 30kHz )






Noise
& hum




High Level: (1) 70 µV RMS maximum
residual unweighted wideband noise at main output with gain control minimum
(98 dB below 5V RMS output). (2) More than 100dB below 1 V RMS input (less
than 7µV equivalent input noise)

(SP-9: Phono IHF weighted 72 dB below 1 mV input)






 




Phono: 0.12 µV equivalent input
noise; IHF weighted, shorted input (78dB below 1 mV input).






Gain




Phono input to tape output: 46dB








Phono input to main output: 67dB
(SP-9: Phono 66dB (RIAA ±.25 dB)








High level inputs to tape output:
0dB






 




High level inputs to main output:
21dB






 




CD input to main output: 9 dB






Input
impedance




50 k ohms line inputs






 




47 K phono (Phono provisions for
any value below 47K ohms or added input capacitance for matching certain
magnetic cartridges)






Output
impedance




250 ohms main output






 




850 ohms recorder output






 




Recommended load 60K ohms and
100pF. (20K ohms minimum)






Output
polarity




 






Maximum
inputs




Phono, 200 mv at 1kHz (1000 mv
RMS, 10kHz)








High level inputs essentially
overload proof






Rated
outputs




2 V RMS 5 kHz to 50 kHz, all out-puts;
60k ohm load (main output capability is 50 V RMS output at 0.5% THD at 1 kHz
into a 100K ohm load with 5V RMS high level input)






Power
supplies




Electronically–regulated low and
high voltage supplies and electronic decoupling. Shielded toroid transformer.
Line Regulation better than .01%.






Tube
complement




(2) 6922






Power
requirements




100-135 VAC 60 Hz (200-270 VAC
50/60Hz) 55 watts max






Other




 






Dimensions




19” (48 cm) W x 5 1/4” (13.4 cm) H
(standard rack panel) x 10 ¼” (26 cm) D. Handles extend 1 ½” (3.8 cm) forward
of the front panel. Rear chassis fittings extend 7/8” (2.3 cm).






Weight




12 lbs. (5.5 kg) Net; 21 lbs. (9.5
kg) Shipping





Read more at
https://www.stereophile.com/content/audio-research-sp9-preamplifier-specifications#7GBdXD5phrZOKCeP.99

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