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Creek Audio OBH-8 Operating Instructions

Creek Audio OBH-8 Operating Instructions

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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.
Operating
Instructions

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Summary of Contents for Creek Audio OBH-8

  • Page 1 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’...
  • Page 2: Power Supply Requirements

    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.
  • Page 3 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...
  • Page 4 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% ±...

This manual is also suitable for:

Obh-9seObh-8seObh-9