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AUDIO RESEARCH 胆前级系列介绍

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发表于 2017-9-22 16:15 | 显示全部楼层 |阅读模式
Tube stereo preamplifier.

This preamp was the predecessor to the Audio Research SP-1 preamp. William Z. Johnson used many of the design features of this preamp when he built the SP-1 preamp. This preamp was built by William Z Johnson and it is a one of a kind unit.

The Electronic Industries PAS-2 preamp took the chassis from the Dynaco Pas-2 and completely redesigned it's interior with new circuit boards and an octal plug for connecting the external power supply. The faceplate is a stock Pas-2 faceplate. The preamp does have a variable loudness control which was a huge improvement over the fixed Dynaco loudness control. The external power supply used the best available parts at that time, and is heavy and very well built.
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 楼主| 发表于 2017-9-22 16:18 | 显示全部楼层
Description
Tube stereo preamplifier. Generally marked 'Electronic Industries'

CSP-1A


Options
30/50 - 150/250 - 500/600 Ohm input and/or output impedances

MSRP (US new retail)
$200 (CSP-1A Hi-Z)
$250 (CSP-1A Hi-Z in; Lo-Z out)
$250 (CSP-1A Lo-Z in; Hi-Z out)
$300 (CSP-1A Lo-Z in; Lo-Z out)


Specifications


Frequency responseAs mike preamplifier: Hi-Z ±1.0 dB 20 Hz to 20 kHz. LoZ ±1.0 dB 30 Hz to 15 kHz.
As phono preamplifier: ±1 dB of RIAA playback from 30 Hz to 15 kHz
As tape head preamplifier: ±1 dB of published curve
Distortion (THD)Less than .1% from 30 Hz to 15 kHz @ 2V RMS (Hi-Z) output (typical, less than .02% in midband)
Intermodulation: Less than .05% 2V RMS output (Hi-Z) (60 Hz and 7 kHz mixed for 4:1 ratio at output)
Noise & humTotal harmonic content as RIAA phono preamplifier: (a) Approximately 300 µV RMS output (Hi-Z) (b) 70 dB below 1 V output (c) Less than 2 µV RMS equivalent input voltage.
GainApproximately 44 dB, reference 1 kHz (Hi-Z)
Input impedance
Output impedance
Output polarity
Maximum inputsHi-Z input: 1 kHz 450 mV RMS
Rated outputsHi-Z output: @ 1 kHz 75 V RMS
Power supplies
Tube complement
Power requirements117V 50/60Hz approximately 16 watts
Other
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 楼主| 发表于 2017-9-22 16:29 | 显示全部楼层
Description
Tube stereo preamplifier. Generally marked 'Electronic Industries'.
Introduced
1970



Revisions
SP-1A
SP-1B
SP-1C

Options
-

MSRP (US new retail)
$750 (SP-1A)

Specifications

SP-1A:

Frequency responseAux and tuner inputs: ±1dB 20Hz to 20 kHz
Magnetic phono input: ±1dB of RIAA curve
Magnetic tape input: ±1dB of Ampex playback curve
Distortion (THD)Harmonic distortion: Less than .01% at 5V RMS output 1kHz on either aux or magnetic input, gain max, high impedance.
Impulse distortion: Essentially none, 30Hz to 15kHz
Noise & humAux: 90dB below 1V input
Mag: 60dB below 10mV input
GainAux: 20dB (voltage gain of 10X)
Mag: 54dB (voltage gain of 500X)
Input impedanceAux: 500Kohm
Mag: 50Kohm
Output impedance
Output polarity
Maximum inputsAux: 50V RMS @ 1kHz
Mag: 750mV RMS @ 1kHz
Rated outputsMaximum output: At least 30V RMS 1 kHz into high impedance
Output load: Up to 2000pF and down to 10Kohm for 5V RMS output
Power supplies
Tube complement(13) 12AX7, (1) 6X4
Power requirements117V 50/60Hz approximately 45 watts
OtherTone control range: ±15dB at 20Hz and 10kHz
DimensionsPanel: 15 5/8" W x 5" H, overall depth 14½"
Panel mounting cutout: 4½" H x 15¼" W
Depth behind panel: 14" (includes cable clearance)
Knob and panel clearance: 1¼"
Weight30 lbs.
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 楼主| 发表于 2017-9-22 16:41 | 显示全部楼层
Tube stereo preamplifier. Generally marked 'Electronic Industries'
Introduced
1969/1970 ?



Revisions
SP-2VT
SP-2SS (FET)
SP-2A
SP-2B (?)
SP-2C


-

MSRP (US new retail)
$395 (SP-2VT)
$495 (SP-2SS)
$550 (SP-2C)

Specifications


Frequency responseAux and tuner inputs: ±1 dB 20 Hz to 20 kHz
Magnetic phono input: ±1 dB of RIAA curve
Magnetic tape input: ±1 dB of Ampex Playback curve
Distortion (THD)Less than .01% at 5 Volts RMS output 1 kHz on either aux or magnetic phono input, gain max, high impedance.
Impulse distortion: Essentially none, 30 Hz to 15 kHz
Noise & humAux: 90 dB below 1 Volt input
Mag: 60 dB below 10 mVolt input
GainAux: 20 dB (voltage gain of 10X)
Mag: 54 dB (voltage gain of 500X)
Input impedanceAux: 500 kOhms
Mag: 50 kOhms
Output impedance
Output polarity
Maximum inputsAux: 50 Volts RMS @ 1 kHz
Mag: 750 mVolts RMS @ 1 kHz
Rated outputsMaximum output level: At least 30 Volts RMS 1 kHz into high impedance.
Power supplies
Tube complement(10) 12AX7
Power requirements117V 50/60Hz approximately 30 watts
OtherOutput load: Up tp 2000pF and down to 10 kOhm for 5 Volts RMS output.
Tone control range: ±15 dB at 20 Hz and 10 kHz
DimensionsPanel: 15 5/8" W x 5" H, overall depth 14 1/2"
Panel mounting cutout: 4 3/4" H x 15 1/4" W
Depth behind panel: 14" (includes cable clearance)
Knob and panel clearance: 1 1/4"
Weight16 lbs. Net, 19 lbs. Shipping

Reviews




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 楼主| 发表于 2017-9-22 16:56 | 显示全部楼层
Description
Tube stereo preamplifier.
Introduced
1972

Discontinued
1976

Revisions
SP-3A (1974)
SP-3A-1 (1975)
SP-3B (1978)


SP-3C (2001)

From the ARC websiteAudio Research has the reputation for the best product support in the industry, which includes service for products that date back to the beginning of the high-end industry and to the founding of our company over 30 years ago. As further support, we occasionally offer update programs for older products to extend their service life and enhance their sonic performance.
The SP3 was introduced in 1972 and was instrumental in establishing Audio Research's world-wide reputation for sonic excellence. Several thousand were sold during the period of 1972-1976 and most, we believe, are still in service today.
It is no longer possible to obtain the high voltage (525WVDC) electrolytic capacitors used in the original design. Along with this consideration, Audio Research has made significant sonic gains during the preceding 20+ years in the design of vacuum-tube preamplifiers. Therefore, it seems an appropriate time to redesign the power supply, using currently manufactured parts, and offer some synergistic sonic upgrades at the same time.
We have prepared a replacement Printed Wiring Board for the SP3's power supply using a highly regulated circuitry quite similar to that used on our present products. This will considerably extend the useful service life of this product both functionally and sonically. The new power supply operates over a very wide range of input voltage (95 Volts to 135 Volts for 120 Volt units) providing regulated DC voltages to the vacuum-tube heaters as well as regulated B+ voltages. We have added automatic muting for turn-on, power interruption and turn-off.
Along with the changes to the power supply, the input and output connectors are replaced with audiophile-grade gold-plated ones. Also, coupling and bypass capacitors on the main Printed Wiring Board are changed to brand names such as Infinicap, REL-Cap and WIMA.
The sum of these changes results in a vacuum-tube stereo preamplifier (with RIAA phono) that approaches the performance of our current preamplifier product line. You will find the bass much more well-defined and extended, the mid-range smoother and more accurate, and the high frequency range extended and more accurate. For those of your who like classic tube sound, this modification takes a large step toward accuracy while preserving the things you like about vacuum tubes.
This update applies to all versions of the SP3. Cost is US$995.00. It does not include tubes, if needed, or shipping. It is offered on a direct basis only, rather than through our dealer or distributor networks. Updates must be scheduled for timely turnaround.
If you have premium quality tubes such as NOS Telefunken, or other quality brands, we suggest you remove and keep such tubes at home, not risking the possibility of loss or damage from handling or shipping. Recommended shipping: UPS. Units sent in without tubes will be tested and evaluated sonically with our tubes installed, but will be returned without tubes unless you request otherwise. Highly modified units may be deemed unacceptable for this update.

Options
Gold/black faceplate.
Walnut cabinet (WC-1)

MSRP (US new retail)
$595
$695 (SP-3A)
$795 (SP-3A-1)

Specifications


SP-3A-1:


Frequency response±1dB 10Hz-30kHz, IHF load
±1dB of RIAA 30Hz-30kHz
Distortion (THD)Harmonic distortion: Less than 0.005% at 5V RMS output, IHF load
IM distortion: Less than 0.005% at 5V RMS output, IHF load, SMPTE method
Noise & humHigh level inputs (unweighted wide-band): more than 90dB below rated output
Magnetic phono inputs (below 10mV input) 20Hz to 20kHz: more than 70dB below rated outputs. Power line components (hum): more than 66dB
Gain57dB, magnetic phono input, main outputs, IHF load
34dB, magnetic phono input, tape outputs, IHF load
23dB, high level inputs, main outputs, IHF load
0dB, high level input, tape outputs, IHF load
Input impedanceMagnetic Phono: 50K ohms typical (150 pf shunt)
High Level: 100K ohms typical
Output impedanceLess than 600 ohms @ 1kHz (all outputs). Recommended load: 20K or greater
Output polarity
Maximum inputs300mV RMS @ 1kHz (magnetic phono input). High level inputs overload proof.
Rated outputsMaximum output: 25V RMS @ 1kHz, all outputs
Power supplies
Tube complement(2) 12AX7 LN, (6) 12AX7
Power requirements120/240V, 50/60Hz, 60 Watts
OtherTone controls: Bass and treble variable ±18dB at 10Hz and 15kHz respectively
Dimensions15 5/8" W x 5½" H x 12½ D
Weight14 lbs. Net. 20 lbs. Shipping

Reviews

Number 3 (SP-3: Full Review), Number 4 (SP-3A: Capsule), Number 5 (SP-3A: Further Thoughts), Number 8 (SP-3A Revised: Full Review)
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 楼主| 发表于 2017-9-22 17:09 | 显示全部楼层
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 楼主| 发表于 2017-10-18 10:24 | 显示全部楼层
Introduced
1976
Discontinued
?

Revisions
SP-4A (1978)

Options
Wood cabinet (WC-2) $75

MSRP (US new retail)
SP-4: $695. Later increased to $895.
SP-4A: $975. Later increased to $1,195. Later increased to $1,395


Specifications


Frequency responseHead amp (optional): 5 Hz to 100 kHz (-3 dB)
Magnetic phono: +/- 0.5 dB of RIAA, 20 Hz to 20 kHz
High level: 1 Hz to 100 kHz (-3 dB)
Distortion (THD)Harmonic distortion: Less than 0.005% @ 2 V RMS output (IHF load, with optional head amp or phono input)
Intermodulation distortion: Less than 0.005% @ 2 V RMS output (IHF load, SMPTE method, with optional head amp or phono input)
THD and IMD decreases with decreasing output
Noise & humHead amp (optional): less than 50 nV equivalent input noise with 10 ohms input (RIAA weighted)
Magnetic phono: less than 0.5 µV equivalent input noise with 1k ohms input (RIAA weighted). Typically 84 dB below 10 mV @ 1 kHz
High level: less than 2 µV equivalent input noise with shorted input and max. gain (20 Hz to 20 kHz). Typically 95 dB below rated output
GainHead amp (optional): 26 dB
Magnetic phono: 36 dB
High level: 24 dB (IHF load)
Input impedanceHead amp (optional): 10 ohms
Magnetic phono: 47k ohms (50 pF min.)
High level: 50k ohms (nominal)
Other values may be substituted. Head amp (optional) adjustable up to 100 ohms. Magnetic phono adjustable up to 100k ohms.
Output impedanceLess than 50 ohms
Output polarity
Maximum inputsHead amp (optional): 5 mV RMS @ 1 kHz
Magnetic phono: 150 mV RMS @ 1 kHz
Rated outputsMaximum 10 V RMS (all outputs, IHF load)
Power supplies
Power requirements120/240 VAC, 50/60 Hz, 25 watts
Other
Dimensions19" (48 cm) W x 8 ½" (21 cm) D x 3 ½" (8.9 cm) H (rack mount front panel)
Weight12 lbs. (5.5 kg) Net, 15 lbs. (7 kg) Shipping


Reviews




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 楼主| 发表于 2017-10-18 10:27 | 显示全部楼层
Solid state stereo preamplifier.
Introduced
1977

Discontinued
1980

Revisions
-

Options
Wood cabinet (WC-2) $75

MSRP (US new retail)
$595. Later increased to $695. Later increased to $895. Later increased to $1,095.

Specifications


Frequency responseHigh level sections: ±.25 dB 20 Hz to 20 kHz. -3 dB points, 1 Hz and 100 kHz
Magnetic phono: ±.5 dB of RIAA, 20 Hz to 20 kHz
Optional moving coil pre-preamp (MCP-1) -3 dB points, 1 Hz and 100 kHz
Distortion (THD)Harmonic distortion: Less than 0.005% at 2 V RMS output (IHF load)
Intermodulation distortion: Less than 0.005% at 2 V RMS output (IHF load, SMPTE method)
THD and IMD decreases with decreasing output
Noise & humHigh level inputs, more than 90 dB below 2 V RMS output. Magnetic phono input, less than 1 µV equivalent input noise with 1 Kohms input (RIAA weighted). Typically 80 dB below 10 mV input at 1 kHz.
GainMagnetic phono input to tape output, 36 dB.
Magnetic phono input to main output, 60 dB.
High level inputs to main output, 24 dB.
Input impedance50 Kohms (nominal, all inputs)
Magnetic phono 50 Kohms 200 pF (capacitance value may be reduced to 50 pF minimum, or increased as necessary).
Output impedance50 ohms, recommended minimum load for maximum audio quality, 10 Kohms.
Output polarity
Maximum inputsHigh level inputs, esentially overload proof.
Magnetic phono input, 150 mV RMS @ 1 kHz.
Rated outputsMaximum output 10 V RMS (all outputs, IHF load).
Power supplies
Power requirements105-120/210-240 VAC, 50/60 Hz, 20 watts
Other
Dimensions19" (48 cm) W (standard rack mount front panel size) x 3 ½" (8.9 cm) H x 8 ½" (21 cm) D. Handles extend 1 ½" (3.8 cm) forward of panel. Rear chassis fittings extend ¾" (1.9 cm).
Weight16 lbs. (7.3 kg) Net, 20 lbs. (9.1 kg) Shipping

Reviews

Number 14 (Survey)
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 楼主| 发表于 2017-10-18 10:33 | 显示全部楼层
Tube stereo preamplifier.
Introduced
1978

Discontinued
?

Revisions
SP-6A (1978)
SP-6B (1980)
SP-6B-1
SP-6C (1981)
SP-6C-1
SP-6C-1 Revised
SP-6E (1982)
SP-6F

The SP-6F is actually an SP-8 MK II! Back in the day American Sound in Toronto could not get any SP-8's to meet customer demand due to a lack of SP-8 faceplates at the time. Some creative thinking between ARC and American Sound led to a run of 20 (or so) SP-8 MK II's with SP-6 faceplates. They called it an SP-6F.

Options
-

MSRP (US new retail)
SP-6: $1,075.
SP-6A: $1,195.
SP-6B: $1,295. Later increased to $1,495.
SP-6C: $2,195.
SP-6C-1: $2,195.
SP-6E: $2,350

Specifications


Frequency responseHigh level section: ±.25dB, 10Hz to 30kHz.
-3dB points approximately .1Hz and 250kHz into hi-Z load. (-3dB point approximately 1 Hz into 100kOhm load.)
Magnetic phono: ±1dB of RIAA from 30Hz to 15kHz.
SP6-B:
High level section: ±.25dB, 5Hz to 30kHz.
-3dB points below 1 Hz and above 100kHz
Magnetic phono: ±.25dB of RIAA from 30Hz to 40kHz.
Distortion (THD)Harmonic distortion: Less than .03% at 5V RMS output, IHF load, 20Hz to 20kHz (typically about .003% in midband).
Intermodulation distortion: Less than .008% at 5V RMS output, IHF load, SMPTE method.
SP6-B:
Harmonic distortion: Less than .01% at 2V RMS output, 20Hz to 20kHz (typically about .0005% in midband).
Intermodulation distortion: Less than .002% at 2V RMS output.
Noise & humHigh level:
(1) 250 µv RMS maximum residual unweighted wide-band noise at main output with gain control minimum (86dB below 5V RMS output).
(2) More than 90dB below 1V RMS input (less than 20 µV equivalent input noise).
Magnetic phono: 5 µV equivalent input noise, wideband RMS (-66dB reference 10mV input).
GainMagnetic phono input to tape output, 34dB.
Magnetic phono input to main output, 60dB.
High level inputs to tape output, 0dB.
High level inputs to main output, 26dB.
Input impedance50 kOhms, all inputs. (Magnetic phono may have any value from 10 ohms to 100 kOhms substituted. Also has provision to add input capacitance for matching certain magnetic cartridges.)
Output impedance500 ohms at 1kHz, rising to 2.1 kOhms at 20Hz, all outputs. Recommended minimum load for maximum audio quality, 20 kOhms.
SP6-B: Less than 500 ohms main output, 1000 ohms tape output. Recommended minimum load for maximum audio quality, 50 kOhms and 250 pF maximum capacitance.
Output polarity
Maximum inputsMagnetic phono, 700 mV at 1kHz (>2V RMS, 100kHz).
High level inputs essentially overload proof.
SP6-B:
Magnetic phono, 500 mV at 1kHz (1.5V RMS, 10 kHz).
High level inputs essentially overload proof.
Rated outputs5V RMS 10Hz to 30kHz, all outputs, IHF load. (Main output capability is 60V RMS output at <1% THD at 1kHz into 100 kOhm load with 3V RMS high level input.)
SP6-B: 2V RMS 5Hz to 30kHz, all outputs, 60 ohm load. (Main output capability is 60V RMS output at .5% THD at 1kHz into a 500 kOhm load with 3V RMS high level input.)
Power suppliesSP6-B: 4 electronically-regulated solid-state supplies. Frequency-compensated high voltage supplies have a total equivalent low frequency stability of greater than 3 farads of capacitance. Line regulation better than .001%.
Tube complementSP6: (2) 12AX7 LN, (4) 12AX7
SP-6C: (2) 12AX7 LN, (2) 12AX7, (2) 6922
SP-6F: (2) 12AX7 LN, (3) 12AX7, (2) 6922, (1) 12BH7
Power requirements105-120/210-240 VAC, 50/60 Hz, 35 watts.
SP6-B: 100-120/190-240 VAC, 50/60 Hz, 35 watts.
Other
Dimensions19" (48 cm) W x 5 1/4" (13.4 cm) H (standard rack panel) x 10 1/4" (26 cm) D. Handles extend 1 5/8" (4.1 cm) forward of front panel. Rear chassis fittings extend 7/8" (2.3 cm).
Weight22 lbs. (10 kg) Net, 30 lbs. (13.75 kg) Shipping

Reviews

Number 13 (SP-6: Full Review), Number 14 (SP-6: Further Thoughts), Number 15 (SP-6A: Full Review), Number 18 (SP-6B: Full Review), Number 19 (SP-6B: Further Thoughts), Number 24 (SP-6C-1: Special Report), Number 25 (SP-6C: Further Thoughts, SP-6C-1 Revised: Special Report), Number 28 (SP-6E: Full Review)


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 楼主| 发表于 2017-10-18 10:42 | 显示全部楼层


Description
Solid state stereo preamplifier.

The heart of the SP-7 preamplifier design is the Analogue Module amplification concept. The four AM-8 Analogue Modules are the result of a search for a solid-state approach that provides superior musically-accurate performance along with immunity from the sonic degradation of power supply and coupling functions.

These modules are highly linear with precise symmetry and balance, along with extremely wide bandwidth. The exceptional dynamic range results from a very low noise floor, careful choice of operating currents and a controlled overload characteristic. The accuracy of musical definition is enhanced by elimination of all audio coupling capacitors and all electrolytic bypass capacitors.

Four high-speed "zero-impedance" electronic regulators are used for total isolation between phono and hi-level amplification sections. These regulators are controlled by precision tracking reference voltage sources with controlled turn-on characteristics. Servo sensors for DC balancing are energized immediately at turn-on, so that safe and silent performance is insured even during final stabilization of the tracking reference voltages. The SP-7 is fully operational within 10 seconds and fully balanced in about 40 seconds. No warm-up muting circuitry is required.

Although the SP-7 has no coupling capacitors, it is technically not "DC-coupled" since it will not pass continuous DC signals. Servo correction circuits are used to maintain DC balance at all times. Sub-sonic response is extended below 0.1Hz to preserve integrity of attack.

Introduced
1981

Discontinued
?

Revisions
-

Options
-

MSRP (US new retail)
$995. Later increased to $1,195. Later increased to $1,295.

Specifications


Frequency responseHigh level section: ±.25 dB, 1 Hz to 50kHz. -3dB points below 0.1 Hz and above 400kHz.
Magnetic phono: ±.25 dB of RIAA, 10 Hz to 40 kHz.
Distortion (THD)Less than .002% at 2V RMS output, 20 Hz to 20 kHz (Typically less than .0005% in the midband).
Intermodulation distortion: Less than .002% at 2V RMS output.
Noise & humHigh level: (1) 250 &micro;V RMS maximum residual unweighted 100 kHz bandwidth noise at main output with gain control minimum (86 dB below 5V RMS output). (2) More than 90 dB below 1V RMS input (less than 20&micro;V equivalent input noise.
Magnetic phono: 2 &micro;V equivalent input noise, wideband RMS (-74 dB reference 10 mV input) (Less than 1 &micro;V above 200 Hz or -80 dB reference 10 mV input).
GainMagnetic phono input to tape output: 28 dB.
Magnetic phono input to main output: 60 dB.
High level inputs to main output: 26 dB.
Input impedance50 kOhm phono, 90 kOhm high level inputs. Also has provision to add to the 30pF phono input capacitance for matching certain magnetic cartridges.
Output impedance250 Ohms main output, 1200 Ohms tape output. Recommended minimum load for best audio quality 600 Ohms and .01&micro;F maximum capacitance main output, 10kOhms and 200pF maximum capacitance tape output.
Output polarity
Maximum inputsMagnetic phono, 500 mV at 1 kHz (2.0V RMS, 10kHz).
High level inputs essentially overload proof.
Rated outputs2V RMS 1 Hz to 50 kHz, 10 kOhm load (maximum main output capability is 14V RMS output at 1/2% THD at 1 Hz to 50 kHz into a 10 kOhm load, 10V RMS at 1/2% THD at 1 Hz to 50 kHz into a 600 Ohm load).
Power suppliesFour electronically-regulated tracking solid-state supplies. Line regulation better than .01%.
Power requirements100-130 VAC 60 Hz (190-250 VAC 50 Hz) 10 Watts.
OtherAmplification: Four AM8 Analog Modules&reg;. No coupling capacitors.
Dimensions19" (48 cm) W x 3 1/2" (8.9 cm) H (standard rack panel) x 8 1/2" (21 cm) D. Handles extend 1 1/2" (3.8 cm) forward of front panel. Rear chassis fittings extend 3/4" (1.9 cm).
Weight16 lbs. (7.3 kg) Net, 20 lbs. (9.1 kg) Shipping.
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 楼主| 发表于 2017-10-18 10:44 | 显示全部楼层
Tube stereo preamplifier.
Introduced
1981

Discontinued
1988

Revisions
SP-8 Rev 1
SP-8 Rev 2
SP-8 Rev 3
SP-8 Rev 4 (1983)
SP-8 Rev 5 (1983)
SP-8 Rev 6
SP-8 Rev 7 (1985)


Rev 1 - Rev 3 are sometimes called MKI.
Rev 4 - Rev 7 are sometimes called MKII.

Options
Wood cabinet (WC-4)

MSRP (US new retail)
SP-8 Rev1: $1,495. Later increased to $1,595.
SP-8 Rev5: $1,795.
SP-8 Rev7: $1,895.

Specifications


SP-8 MKII:

Frequency responseHigh level section: ±.25dB, 5Hz to 30kHz. -3dB points below 1Hz and above 100kHz
Magnetic phono: ±.25dB of RIAA, 30Hz to 40kHz
Distortion (THD)Harmonic distortion: Less than .01% at 2V RMS output, 20Hz to 20kHz (Typically less than .0005% in midband)
Intermodulation distortion: Less than .002% at 2V RMS output
Noise & humHigh level: (1) 250&micro;V RMS maximum residual unweighted wideband noise at main output with gain control minimum (86dB below 5V RMS output) (2) More than 90dB below 1V RMS input (less than 20&micro;V equivalent input noise)
Magnetic phono: 5&micro;V equivalent input noise, wideband RMS (-66dB reference 10mV input) (Approximately 1&micro;V above 200Hz or -80dB reference 10mV input)
GainMagnetic phono input to tape output: 34dB
Magnetic phono input to main output: 60dB
High level inputs to tape output: 0dB
High level inputs to main output: 26dB
Input impedance50K ohms, all inputs (Magnetic phono may have any value from 10 ohms to 100K ohms substituted. Also has provision to add to the 40pF input capacitance for matching certain magnetic cartridges.)
Output impedance1000 ohms main output and tape output. Recommended minimum load for maximum audio quality 20K ohms and .001&micro;F maximum capacitance.
Output polarity
Maximum inputsMagnetic phono, 900mV at 1kHz. (3.5V RMS, 10kHz) High level inputs essentially overload-proof.
Rated outputs2V RMS 5Hz to 30kHz, all outputs; 60K ohm load (main output capability is 60V RMS output at &frac12;% THD at 1kHz into 100K ohm load with 3V RMS high level input)
Power suppliesElectronically-regulated supplies utilizing both vacuum tube and solid state elements. Line regulation better than .01%
Tube complementSP-8 MKI: (2) 12AX7 LN, (3) 12AX7, (2) 6922, (1) 12BH7
SP-8 MKII: (2) 12AX7 LN, (2) 12AX7, (2) 6922, (1) 12AT7, (1) 12BH7
Power requirements100-125VAC 60Hz (190-240VAC 50Hz) 60 Watts
Other
Dimensions19" (48 cm) W x 5&frac14;" (13.4 cm) H (standard rack panel) x 10&frac14;" (26 cm) D. Handles extend 1 5/8" (4.1 cm) forward of front panel. Rear chassis fittings extend 7/8" (2.3 cm).
Weight22 lbs. (10 kg) Net: 30 lbs. (13.75 kg) Shipping

Reviews

Number 24 (SP-8 Rev 1: Full Review)
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 楼主| 发表于 2017-10-18 10:48 | 显示全部楼层
Hybrid tube/FET stereo preamplifier.
Introduced
1987

Discontinued
1996

Revisions
SP-9 MKII (1991)
Technically, the Mark II version of the SP9 preamplifier includes a group of 14 different improvements, utilizing 61 component and wire changes. These combine to provide enhanced reliability and flexibility, in addition to the sonic improvements.
- In the CD unit the gain has been reduced by 12 dB, allowing operation of the gain control in its mid rotation or high positions, while still leaving all other inputs with normal gain for lower input program sources.
- Low-level hum in the line section is reduced 10-20 dB, which is noticeable primarily in systems with high-efficiency speakers, small “live” rooms, high-gain power amps, or low-noise CD program sources.
- The power supply and phono sections are “beefed up” to prevent accidental damage if a CD source is mistakenly connected to the MC phono inputs and is played at a high level, even with the mute on.


SP-9 MKIII (1993)
The technical improvements are numerous, and include the liberal use of M.I.T. capacitors in critical input and output locations; additional filter and bypass capacitors for the power supply; a new input circuit board that reduces point-to-point wiring and improves overall grounding; new gold-sleeved tube sockets for better corrosion resistance and lower noise; new 6922 dual triode tubes; and improved high voltage regulation. New units also have the new, thicker front panel and handles, while these are optional on updated units. Note that only MK II units can be upgraded to the MK III standard; earlier units must first be upgrade to the MK II level.

Options
Remote control $500 (1994)

MSRP (US new retail)
$1,695
$1,795 (SP-9 MKII)
$2,495 (SP-9 MKIII)

Specifications
SP9 MKIII:

Frequency responseHigh 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 & humHigh Level: (1) 70 &micro;V 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 7&micro;V equivalent input noise)
(SP-9: Phono IHF weighted 72 dB below 1 mV input)
Phono: 0.12 &micro;V equivalent input noise; IHF weighted, shorted input (78dB below 1 mV input).
GainPhono 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 impedance50 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 impedance250 ohms main output
850 ohms recorder output
Recommended load 60K ohms and 100pF. (20K ohms minimum)
Output polarity
Maximum inputsPhono, 200 mv at 1kHz (1000 mv RMS, 10kHz)
High level inputs essentially overload proof
Rated outputs2 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 suppliesElectronically–regulated low and high voltage supplies and electronic decoupling. Shielded toroid transformer. Line Regulation better than .01%.
Tube complement(2) 6922
Power requirements100-135 VAC 60 Hz (200-270 VAC 50/60Hz) 55 watts max
Other
Dimensions19” (48 cm) W x 5 1/4” (13.4 cm) H (standard rack panel) x 10 &frac14;” (26 cm) D. Handles extend 1 &frac12;” (3.8 cm) forward of the front panel. Rear chassis fittings extend 7/8” (2.3 cm).
Weight12 lbs. (5.5 kg) Net; 21 lbs. (9.5 kg) Shipping

Reviews

Issue 50 (SP-9: Full Review), Issue 52 (SP-9: Further Thoughts)
Vol. 10 No. 8 (SP-9), Vol. 13 No. 11 (SP-9 MKII), Vol. 14 No. 6 (SP-9 MKII)

Pictures
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 楼主| 发表于 2017-10-18 10:50 | 显示全部楼层
Description
Two-chassis tube stereo preamplifier.
Introduced
1982

Discontinued
?

Revisions
SP-10 Rev 1
SP-10 Rev 2
SP-10 Rev 3
SP-10 Rev 4
SP-10 Rev 5
SP-10 Rev 6
SP-10 Rev 7

Rev 1 - Rev 5 are sometimes called MKI.
Rev 6 - Rev 7 are sometimes called MKII.

Options
Wood cabinet (WC-4)

MSRP (US new retail)
$3,450. Later increased to $3,700.

Specifications


Frequency response
Distortion (THD)< .01% @ 2V RMS output
Noise & humPhono: 88 dB below 10 mV input RIAA weighted
GainPhono: 72 dB (RIAA ±.25 dB, 20Hz to 40kHz)
Line: 26dB (± .25 dB 5Hz to 30kHz)
Input impedance
Output impedance
Output polarity
Maximum inputs
Rated outputs
Power supplies
Tube complement(4) 6922 LN, (8) 6922, (2) 5881, (1) 12AT7
Power requirements
Other
Dimensions19" W x 5.25" H x 10.25" D (each unit)
Weight49 lbs. Shipping

Reviews

Number 32 (SP-10: Full Review), Number 33 (SP-10: Special Report), Issue 47 (SP-10 Revised: Editor's Choice), Issue 39&40 (SP-10 MKII: Further Thoughts)
Vol. 7 No. 3 (SP-10), Vol. 7 No. 7 (SP-10 Revised), Vol. 9 No. 7
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 楼主| 发表于 2017-10-18 10:52 | 显示全部楼层
Description
Two-chassis hybrid tube/FET stereo preamplifier.

Introduced
1985

Discontinued
?

Revisions
SP-11 Revised
SP-11 MKII (1987)
SP-11 MKII Special Edition (1990): Limited to 50 sets in gold/champagne faceplates to celebrate ARC's 20th anniversary.

Options
-

MSRP (US new retail)
$4,900
$4,995/$5,995 (SP-11 MKII)


Specifications


Frequency responseHigh level input: ±1dB 0.2Hz to 100kHz. -3dB below 0.1Hz and above 100kHz.
Phono input: ±.2dB of RIAA 10Hz 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 & humIHF weighted, shorted input:
Output (Gain down): 6&micro;V (110dB below rated output)
Input (High level): 3&micro;V equivalent input (110dB below 1V input)
Phono: 0.15&micro;V equivalent input (76dB below 1mV input)
GainAt 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 impedancePhono: Front panel selectable 47K, 100, 30, 10, 3 ohms. Phono input capacitance: 150 pF at 10kHz.
High level: 20Kohms or higher, depending on switch functions
Output impedance250 ohms main, direct, inverted outputs. 500 ohms tape output. Recommended load 60Kohms and 100pF (20Kohms minimum, 1000pF maximum)
Output polarityTape outputs, direct output: Non-inverting
Invert output: Inverting
Main outputs (2): Selectable non-inverting or inverting. All outputs may be used simultaneously.
Maximum inputsPhono: 350 mV RMS at 1kHz, 1200 mV RMS at 10kHz (0.1 second maximum duration, 6dB less if continuous.
High level: 25V RMS
Rated outputs2V 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 requirements95-135VAC 60Hz, 190-270VAC 50/60Hz, 130 Watts maximum
OtherFilter: 25Hz Hi-pass phono subsonic 6dB/octave rolloff (to eliminate ringing) with transition to 12dB/octave at 10Hz. Front panel switchable phono only.
Dimensions19" (48 cm) W x 5.25" (13.4 cm) H x 10.25" (26 cm) D (each unit). Handles extend 1 5/8" (4.1 cm) forward of panel. Interconnect cable extends 4" behind rear of chassis.
WeightSP-11: Net 14 lbs. (6.4 kg); Shipping 23 lbs. (10.5 kg)
SP-11PS: Net 15 lbs. (6.8 kg); Shipping 23 lbs. (10.5 kg)
Total: Net 29 lbs. (13.2 kg); Shipping 46 lbs. (21.0 kg)

Reviews

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 MKII: Special Report)
Vol. 9 No. 4 (SP-11), Vol. 9 No. 7 (SP-11)
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