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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
The output from the OBH 18 can be connected to most integrated amplifier’s and
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
The power supply which has been provided is a switchable supply with a universal input range of 100 – 240 Volts. The
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
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.