Creek OBH-8-SE Owners manual

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
INPUT SENSITIVITY AND IMPEDANCE 0.5 mV/ 1000 / 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
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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.
The output from the OBH-8/9 can be connected to most integrated and pre-amplifier's line inputs via a regular Phono to Phono (RCA to RCA) stereo interconnect lead.
POWER SUPPLY REQUIREMENTS
In common with all electrical appliances, the OBH-8/9 requires a power source. The requirement for the OBH-8/9 is for 24 Volts DC, at 30 milli Amps current, or higher. An OBH-1, or OBH-2, standard, or high grade, power supply, dedicated for the local voltage and plug type, has been provided. It has a thin cable exiting from it, with a
2.1mm positive centre pin DC power jack fitted on the other end. It should be connect­ed to the Phono amp via the DC inlet mounted on its rear panel.
To operate the phono amp it is necessary to switch-on the unit by pushing the power button on the front panel.
N.B. Due to the inherent muting circuitry in the OBH-8 & 9 the signal will take a few
seconds to be heard after the power is switched on. Keep the main amps volume control at minimum to avoid hearing any unpleasant noises during the on/off phase.
REAR PANEL CONNECTION OF THE OBH-8 AND OBH-9
Note 1. The OBH should be placed away from transformer hum fields for the lowest
noise operation.
Note 2. It is also necessary for the OBH to be 'burned-in' for at least 24 hours before
its full sound quality potential can be realised.
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CREEK OBH-8SE MM PHONO AMP SPECIFICATION
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 ± 0.1 dB
OUTPUT 250 mV
OUTPUT IMPEDANCE 750
INPUT SENSITIVITY AND IMPEDANCE 3.5 mV/ 47 k/ 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 63 mm
POWER SUPPLY VOLTAGE 24V DC 30 mA
Supplied with an OBH-2 High Grade Mains Power Supply, 220-240V 50Hz or 110-120V 60Hz
CREEK OBH-8 MM PHONO AMP SPECIFICATION
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 ± 0.25 dB
OUTPUT 250 mV
OUTPUT IMPEDANCE 750
INPUT SENSITIVITY AND IMPEDANCE 3.5 mV/ 47 k/ 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 63 mm
POWER SUPPLY VOLTAGE 24V DC 30 mA
Supplied with an OBH-1 Standard Mains Power Supply, 220-240V 50Hz or 110-120V 60Hz
MM Input
Output
DC Inlet 24V 30 mA
Use only Creek Phono Power Supply
Ground
Turntable
Rear of Amplifier
OBH Power Supply
Phono output and ground from turntable
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