The function of the OBH-8 and OBH-9 is to boost the level and correct the frequency
response of a low level signal coming from a phono pick-up on a conventional
turntable. The signal required by most modern amplifiers is described as being 'LINE'
level, which is, in technical terms, between 200 and 500 milli Volts with a flat frequency response.
Unless your amplifier has a specific 'Phono' or Disc input, the level will be too low and
the frequency response will be wrong. The OBH-8 and OBH-9 are designed to boost
the signal and introduce an R.I.A.A. frequency response characteristic. The OBH8SE special edition operates in every respect like the OBH-8.
INPUT AND OUTPUT CONNECTION
The output from the turntable is normally terminated on
two 'Phono' plugs or RCA jacks. The level is dependent
on the type of cartridge used, and in the case of Moving
Magnet, will normally be around 2 - 5 milli Volts and for
Moving Coil - 200 - 500 micro Volts. Low output MC
cartridges will require the higher gain of the OBH-9.
Most MM, or high output MC cartridges will be properly
matched by using the OBH-8 or 8SE. By plugging the
signal leads from your turntable into the OBH-8 or 9
input, the signal will be boosted to 'LINE' level at its output. To prevent hum pick-up, it may be necessary to
join the turntable's earth lead to the OBH-8/9 ground
terminal.
CREEK OBH-9 MC PHONO AMP SPECIFICATION
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 ± 0.25%
OUTPUT 250 mV
OUTPUT IMPEDANCE 750
ΩΩ
INPUT SENSITIVITY AND 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 63 mm
POWER SUPPLY VOLTAGE 24V DC 30 mA
Supplied with an OBH-2 High Grade Power Supply, 220-240V 50Hz (UK).
Will work with an OBH-1 Standard Mains Power Supply and may be upgraded to OBH-2.
N.B. We recommend that the OBH-9 is used with the OBH-2 for the best performance.
Creek Audio Ltd reserve the right to change or modify the specification of its products without prior warning.
Creek
OBH
-8
OBH
-8SE
OBH
-9
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Creek Audio Ltd
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
Designed and made in the UK.