Creek Audio OBH 15 User manual

SPECIFICATION Creek OBH 15
MOVING MAGNET
GAIN 37dB Phono Pre-Amplifier
FREQUENCY RESPONSE 20 Hz to 20 kHz +/- 0.25 dB
SIGNAL TO NOISE RATIO -83 dB
TOTAL HARMONIC DISTORTION < 0.03%
RIAA DEVIATION +/- 0.5%
OUTPUT 250 mV
OUTPUT IMPEDANCE < 100 W
INPUT SENSITIVITY/IMPEDANCE 3.5 mV / 47 kW/220 pF
OVERLOAD MARGIN 22 dB
MATES WELL WITH MM CARTRIDGES 2.5 mV - 5 mV output
MOVING COIL
GAIN 56 dB
FREQUENCY RESPONSE 20 Hz to 20 kHz +/- 0.25 dB
SIGNAL TO NOISE RATIO - 75 dB
TOTAL HARMONIC DISTORTION < 0.05%
RIAA DEVIATION +/- 0.5% Operating
OUTPUT 250 mV
OUTPUT IMPEDANCE < 100 WInstructions
INPUT SENSITIVITY/IMPEDANCE 0.5 mV / 1000 W/3300 pF
OVERLOAD MARGIN 20 dB
MATES WELL WITH MC CARTRIDGES 0.5 mV - 1 mV output Thank you for purchasing the OBH 15 phono pre-amplifier. You are
DIMENSIONS 150 x 100 x 66 mm
POWER SUPPLY VOLTAGE 24V DC 30 mA now in possession of a state-of-the-art product. The functions and
operation of the OBH 15 are extremely simple. The following notes
WARRANTY are provided to explain all aspects of its design and use.
If within two years of the purchase date your OBH product proves to
be defective for any reason other than accident, misuse, neglect, The function of the OBH 15 is to boost the level and correct the
unauthorised modification or fair wear and tear, Creek Audio Ltd frequency response of a low level signal coming from a phono pick-
will, at its discretion, replace the faulty parts without charge for up on a conventional turntable.
labour or return carriage within the U.K.This warranty is valid only
within the U.K. and given in addition to statutory rights. Service The signal required by most modern amplifiers is described as
enquiries outside the U.K. should be addressed first to the being 'LINE' level, which is, in technical terms, between 200 and
supplying dealer and or Creek distributor/importer. Warranties 500 milli Volts with a flat frequency response.
granted in these countries are entirely at the discretion of the
distributor. Unless your amplifier has a specific 'Phono' or Disc input, the level
will be too low and the frequency response will be wrong. The
Creek Audio Limited OBH 15 is designed to boost the signal and introduce an R.I.A.A.
12 Avebury Ct, Mark Road, Hemel Hempstead HP2 7TA England frequency response characteristic.
Telephone: [phone] Fax: [phone]
E-mail: [email protected] Web: www.creekaudio.com

INPUT AND OUTPUT CONNECTION WIRING THE OBH 15
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.
Most MM or high output MC cartridges will be properly matched by
using the OBH 15. By plugging the signal leads from your turntable
into the OBH 15 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 15 ground terminal.
The output from the OBH 15 can be connected to most integrated
amplifier’s and pre-amplifier's line inputs via a regular Phono to
Phono (RCA to RCA) stereo interconnect lead.
The output impedance of the OBH 15 is <100 W, therefore it can be used
Connect the OBH 15 to the input of your amplifier with a stereo
to drive long interconnects without loss, provided they are high
RCA inter-connect cable. If using a Creek integrated amplifier
capacitance types.
connect to the first input.
The OBH 15 is a switchable phono pre-amplifier, allowing you to
POWER SUPPLY REQUIREMENTS
change from moving magnet to moving coil from a switch on the
In common with all electrical appliances, the OBH 15 requires a
rear panel.
power supply.
The connection for the phono output from the turntable plus
The requirement for the OBH 15 is for 24 Volts DC at 30 milli-Amps
ground is clearly marked for MM and MC. Once connected select
current, minimum. A custom Creek power supply (Creek-Uni) has
MM or MC from the switch located on the rear panel.
been provided and this must be connected via the DC inlet on the
rear panel of the OBH 15.
The power supply is connected to the 2.1mm positive pin power
jack and then to the wall socket. The OBH 15 should be placed
The power supply which has been provided is a
away from power supply hum fields for the lowest noise operation.
NOTE
Due to the inherent muting circuitry in the OBH 15, the signal will
take a few seconds to be heard after the power is switched on.
It is necessary for the OBH 15 to be ‘burned in’ for at least 24 hours
The on/off switch is located on the rear panel. As the OBH 15 draws
before its full sound quality potential can be realised.
very little power it may be left switched on permanently.
switchable supply
with a universal input range of 100 – 240 Volts. The Creek-Uni
power supply is supplied with a pack of universal plug fittings to
adapt for Europe, U.K. and the Far-east, USA and Australia.
Choose the correct fitting for your country of use and simply snap
in place.