Creek Audio OBH-8 User manual

Operating

Instructions

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

OBH-8 Special Edition is an audiophile version of the OBH-8 and 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 OBH-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.

The output from the OBH-8/9 can be connected to most integrated and preamplifier’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 mill! Amps current, or higher. An

OBH-1 standard power supply, or OBH-2 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 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.

WIRING THE OBH-8 AND OBH-9

Rear of Amplifier

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.

CREEK OBH-8 SPECIFICATION

GAIN 37 dB

FREQUENCY RESPONSE 20 Hz to 20 kHz ± 0.25 dB

SIGNAL TO NOISE RATIO -82dB

TOTAL HARMONIC DISTORTION < 0.05%

R1AA DEVIATION ± 0.25 dB

OUTPUT 250 mV

OUTPUT IMPEDANCE 750 Q

INPUT SENSITIVITY AND IMPEDANCE 3.5 mV/ 47 kQ / 220 pF

OVERLOAD MARGIN 22 dB

MATES WELL WITH CARTRIDGES WITH 1.5 mV to 5.0 mV output

DIMENSIONS 100 x 100x63 mm

POWER SUPPLY VOLTAGE 24V DC 30 mA

Supplied with an OBH-1 Standard Power Supply, 220-240V 50Hz or 110-120V 60Hz

CREEK OBH-8SE SPECIFICATION

GAIN 37 dB

FREQUENCY RESPONSE 20 Hz to 20 kHz ± 0.25 dB

SIGNAL TO NOISE RATIO -86dB

TOTAL HARMONIC DISTORTION < 0.03%

R1AA DEVIATION ± 0.1 dB

OUTPUT 250 mV

OUTPUT IMPEDANCE 7500

INPUT SENSITIVITY AND IMPEDANCE 3.5 mV/ 47 kQ / 220 pF

OVERLOAD MARGIN 25 dB

MATES WELL WITH CARTRIDGES WITH 1.5 mV to 5.0 mV output

DIMENSIONS 100 x 100 x 63 mm

POWER SUPPLY VOLTAGE 24V DC 30mA

Supplied with an OBH-2 High Grade Regulated Power Supply, 220-240V 50Hz or

110

120V

60Hz

CREEK OBH-9 & OBH-9SE SPECIFICATION

OBH-9 OBH-9SE

GAIN 56 dB 65 dB

FREQUENCY RESPONSE 20 Hz to 20 kHz ± 0.25 dB

SIGNAL TO NOISE RATIO -75dB - 70 dB

TOTAL HARMONIC DISTORTION < 0.05% < 0.05%

R1AA DEVIATION ± 0.5% ± 0.5%

OUTPUT 250 mV 250 mV

OUTPUT IMPEDANCE 750 D 750 Q

INPUT SENSITIVITY / IMPEDANCE 0.5 mW 1000 0 / 3300 pF

INPUT SENSITIVITY / IMPEDANCE - SE 0.15mV/1000Q/3300pF

OVERLOAD MARGIN 20 dB 25 dB

MATES WELL WITH MC CARTRIDGES 0.5 mV -1 mV output

SE MATES WELL WITH MC CARTRIDGES 0.15 mV -0.3 mV output

DIMENSIONS 100 x 100 x 63 mm

POWER SUPPLY VOLTAGE 24V DC 30mA

Designed and made in the UK.

Both supplied with an OBH-2 High Grade Regulated Power Supply, 220-240V 50Hz or

110-120V’60Hz

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2 Bellevue Road, Friern Barnet, London N113ER, England

Tel: + 44 (0)20 - 8361 4133 Fax: + 44 (0)20 - 8361 4136

E-mail: info@creekaudio.co.uk Internet: wv7w.creekaudio.co.uk

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