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Audio Research PH3
SOLD $2,000.00
MAR 2010
Amazing value like this is not
common to see everyday. Want to get back at your gal for not speaking up
to the microphone this morning....? Boy have I got a hot deal for you
all. This will make her see RED for a month and if turned up loud enough
is guaranteed to drown out her nagging to boot. This means exactly what
you had always wished, you get to kill two birds with one stone!
A mint condition all tubed phono
stage from Audio Research with 3 x 6922 valves and
with a sound so rich & sweet that will make you cream your shorts faster
then you can say, "Praise be to the great Bill Johnson!"
The PH3 is a phono
pre-amplification stage intended for use with an active line-level
stereo preamplifier. Fully single-ended from input to output, the PH3
uses a combination of J-FET input stage technology (for low inherent
circuit noise) and class A operation vacuum-tube gain via three 6922
twin triodes. Total gain of the PH3 is 54 dB (non-adjustable). Used with
typical line preamplifiers having 12 to 18 dB of gain, the PH3 is
suitable for phono cartridges having .25 mV output or higher. Input
impedance is factory-set at 47K ohms, and input capacitance at 90 pF.
For optimal matching to moving-coil and moving-magnet phono cartridges,
both input impedance and input capacitance may be adjusted via simple
resistor and capacitor changes.
A resistor kit (with solder) is supplied for proper loading values
between 30 and 800 ohms. Additional resistor values and capacitors may
be ordered from the factory. On the rear panel, the PH3 provides one
pair of gold-plated, audiophile-grade single-ended connectors for L & R
inputs, and one pair for outputs. High-quality single-ended
interconnects such as Audio Research Litz Link 2 brand are strongly
recommended for best sonic performance with the PH3.
Specifications:
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Frequency response |
±.15dB of RIAA, 10Hz to
60kHz; 3dB points below 0.5Hz and above 400kHz |
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Distortion (THD) |
Less than .005% at .50V RMS
1kHz output |
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Noise & hum |
0.1µV equivalent input
noise, IHF weighted, shorted input (80 dB below 1mV 1kHz input) |
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Gain |
54dB at 1kHz (MC & MM
compatible) |
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Input impedance |
47K ohms and 90pF
Unbalanced. (Provisions for any value below 47K ohms or added
input capacitance for matching certain magnetic cartridges.) |
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Output impedance |
200 ohms Unbalanced.
Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and
2000pF maximum.) |
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Maximum inputs |
60mV RMS at 1kHz (240 mV
RMS at 10kHz) |
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Rated outputs |
.50V RMS 10Hz to 60kHz,
100K ohm load (output capability is 30V RMS output at 1/2% THD
at 1kHz). |
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Power supplies |
Electronically-regulated
low and high voltage supplies. Line regulation better than .01% |
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Tube complement |
(3) 6922/E88cc dual triodes |
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Power requirements |
100-135VAC 60Hz (200-270VAC
50/60Hz) 28 watts maximum. Line fuse 0.6A SLO BLO (0.3A SLO BLO
230V) |
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Other |
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Dimensions |
19" (48 cm) W x 5.25" (13.4
cm) H (standard rack panel) x 10.25" (26 cm) D. Handles extend
1.50" (3.8 cm) forward of front panel. Rear chassis fittings
extend .75" (2.2 cm) |
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Weight |
10 lbs. (4.5 kg) Net; 19
lbs. (8.6 kg) Shipping. |
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