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and given in addition to statutory rights. Service enquiries outside the U.K. should be addressed first to the supplying dealer and or Creek distributor/importer. Warranties granted in these countries are entirely at the discretion of the distributor. Creek Audio Limited 12 Avebury Ct, Mark Road, Hemel Hempstead HP2 7TA England Telephone: +44 (0) 1442 260146 Fax: +44 (0) 870 622 0846 E-mail: info@creekaudio.com Web: Creek OBH 18 Phono Pre-Amplifier Operating Instructions Thank you for purchasing the OBH 18 phono pre-amplifier. You are now in possession of a state-of-the-art product. The functions and operation of the OBH 18 are extremely simple. The following notes are provided to explain all aspects of its design and use. The function of the OBH 18 is to boost the level and correct the frequency response of a low level signal coming from a phono pickup 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 flatfrequency 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 18 is designed to boost the signal and introduce an R.I.A.A. frequency response characteristic. _ OzizR) 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. Most MM cartridges will be properly matched by using the OBH 18. By plugging the signal leads from your turntable into the OBH 18 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 18 ground terminal. The output from the OBH 18 can be connected to most integrated amplifier’s and pre-amplifier's line inputs via a regular Phono to Phono (RCAto RCA) stereo interconnect lead. The output impedance of the OBH 18 is <100 W, therefore it can be used to drive long interconnects without loss, provided they are high capacitance types. POWER SUPPLY REQUIREMENTS In common with all electrical appliances, the OBH 18 requires a power supply. The requirement for the OBH 18 is for 24 Volts DC at 30 milli-Amps current, minimum. A custom Creek power supply (Creek-Uni) has been provided and this must be connected via the DC inlet on the rear panel of the OBH 18. The power supply which has been provided is a 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. The on/off switch is located on the rear panel. As the OBH 18 draws very little power it may be left switched on permanently. WIRING THE OBH 18 Connect the OBH 18 to the input of your amplifier with a stereo RCA inter-connect cable. If using a Creek integrated amplifier connect to the first input. The connection for the phono output from the turntable plus ground is clearly marked on the rear panel. 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 away from power supply hum fields for the lowest noise operation. NOTE Due to the inherent muting circuitry in the OBH 18, 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 before its full sound quality potential can be realised....