Creek OBH-9 Brochure
I
s your vinyl input getting a little
long in the tooth? Or does your
new Hi-Fi amplifier not have a
phono input? Either way the Creek
phono pre-amps will give a boost to
your system.
Employing state-of-the-art circuitry and high grade components,
the OBH - Phono pre-amps perform
miracles at a very modest price. To
optimise the match with specific cartridges there are two separate products, OBH-8 for moving magnet and
OBH-9 for moving coil.
Creek engineers have designed
the OBH phono circuitry to use discrete transistors, instead of more
usual integrated circuits. This provides the flexibility to use circuit
topology more normally found in
high-end equipment. A singleended, Class A gain stage with passive RIAA equalisation and zero negative feedback achieves tube-like
performance while maintaining low
noise and current consumption.
The single-ended OBH gain
stage is designed in such a way that
it can produce high gain and linearity, without requiring negative feedback to achieve low distortion. Zero
negative feedback eliminates the
need for phase compensation that
would slow down the amplifier at
high frequencies. Other detrimental
effects like dynamic intermodulation
distortion will also be eliminated.
This allows the OBH-8/9 to produce
a very open and dynamic sound.
Passive EQ offers superior sonic performance to the more conventional
Active EQ, but requires the careful
choice of close tolerance capacitors
and resistors. OBH products use 1%
metal film resistors and polypropylene capacitors.
Power- on is smooth as the signal level rises slowly. Switch-off is
also quiet. The performance of the
OBH is only limited by the quality of
its power supply and source. The
OBH-8 is provided with a low cost
OBH-1 power supply, whereas the
OBH-8SE and OBH-9 come with
the OBH-2 power supply. This can
vary from one country to another.
To provide a simple upgrade path
for the OBH -8, it is recommended
to use the high grade OBH-2 power
supply.
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MMMM AANNDD MMCC PPHHOONNOO
PPRREE--AAMMPPLLIIFFIIEERRSS
DDEESSIIGGNNEEDD TTOO
EENNHHAANNCCEE YYOOUURR
HHII--FFII SSYYSSTTEEMM
Creek
OBH-8, OBH-8
SE
& OBH
-
9
MMMM && MMCC PPHHOONNOO PPRREE--AAMMPPLLIIFFIIEERRSS
...These new Creeks are
easily
THE BEST LOW-PRICE
phono stages on the market...
... I was seriously impressed.
The way it combined real
smoothness and refinement
with genuine musicality and
truthfulness was a joy.
HI-FI World, Nov 1997
...The Creek OBH-8 is not
only fundamentally correct in its
performance, it is quite refined.
Creek obviously has an
EXCEP
-
TIONAL CIRCUIT
encased in the
diminutive OBH-8 chassis...
The Audio Adventure, USA
Dec 1995
...These pre-amps sound
rich, tuneful and musical.
Audio Advisor, USA,
Feb 1997
WORLD VERDICT
Smooth, yet truly musical,
these are the best entrylevel phono stages around
at present.
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The OBH-8 and OBH-9 use
dedicated circuitry to optimise their
performance and cannot be
switched from MM to MC. The
level output from both the OBH-8
and 9 is suitable for most line level
amplifiers and the input sensitivity
and loading is factory-set to suit a
wide range of cartridges.
OBH-8SE
There is now an Audiophile
version of the OBH-8 known as
the Special Edition, which uses
audio grade and closer tolerance
components, with specific circuitry
added to enhance its performance.
The SE gain stage uses a cascoded
low noise J-FET, instead of a single bi-polar transistor. This
enables the input to be DC coupled, removing a capacitor from
the signal path. Cascoding
increases the gain, especially at
high frequencies and therefore
improves linearity.
Signal connectors on the SE
are gold plated and the OBH-8SE
is supplied with the up-rated, high
current OBH-2 power supply.
These improvements add up to a
more transparent, dynamic and
revealing sound, totally lacking in
colouration, that will thrill vinyl
enthusiasts.
Gain 37 dB
Frequency Response 20 Hz to 20 kHz ± 0.25 dB
Signal to Noise Ratio - 82 dB
Total Harmonic Distortion < 0.05%
R1AA deviation ± 0.5 dB
Output 250 mV
Output Impedance 750
ΩΩ
Input sensitivity/impedance 3.5 mV/ 47 kΩΩ/ 220 pF
Overload margin 22 dB
Mates well with cartridges with a 1.5 mV to 5.0 mV output.
Dimensions 100 x 100 x 65 mm
Weight 420 g
Gain 56 dB
Frequency Response 20 Hz to 20 kHz ± 0.25 dB
Signal to Noise Ratio - 75 dB
Total Harmonic Distortion: < 0.05%
R1AA deviation ± 0.5%
Output 250 mV
Output Impedance 750
ΩΩ
Input sensitivity/impedance 0.5 mV/ 1000 ΩΩ/ 3300 pF
Overload margin 20 dB
Mates well with moving coil cartridges with a 0.5 mV to 1.0 mV output.
Dimensions 100 x 100 x 65 mm
Weight 420 g
OOBBHH--88SSEE TTEECCHHNNIICCAALL SSPPEECCIIFFIICCAATTIIOONN
OOBBHH--99 TTEECCHHNNIICCAALL SSPPEECCIIFFIICCAATTIIOONN
Creek Audio Limited reserves the right to modify or change the specifications of its products at any time without notice.
2 Bellevue Road, Friern Barnet,
London N11 3ER, England
Tel: 00 44 + (0)181-361 4133
Fax: 00 44 + (0)181-361 4136
E-mail: mcreek@ibm.net
Internet: www.creekaudio.co.uk.
Gain 37 dB
Frequency Response 20 Hz to 20 kHz ± 0.25 dB
Signal to Noise Ratio - 86 dB
Total Harmonic Distortion < 0.03%
R1AA deviation ± 0.5 dB
Output 250 mV
Output Impedance 750
ΩΩ
Input sensitivity/impedance 3.5 mV/ 47 kΩΩ/ 220 pF
Overload margin 25 dB
Mates well with cartridges with a 1.5 mV to 5.0 mV output.
Dimensions 100 x 100 x 65 mm
Weight 420 g
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