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The OBH-15 MK2 Phono Pre-Amplifier from Creek Audio is designed to boost the audio input level and correct the frequency response of the output from a moving magnet (MM) or moving coil (MC) phono cartridge to make it compatible with a standard line level amplifier input. Level and frequency response correction follow the standards established by the Recording Industry Association of America (RIAA).
The OBH-15 MK2 has a circuit which features a discrete transistor for the MC and an integrated circuit for the MM stages. It has multiple gain settings and matching capabilities for capacitance and resistance. This pre-amplifier features a solid aluminum front panel with a black finish. Its extruded black aluminum case is fitted with turned aluminum disc feet and sound absorbing, adhesive rubber bumpers.
A OBH-Uni power supply adapter with three snap-on power connectors is included. These power adapter connectors can be used in Europe, the UK, and North America.
Note: Never connect or disconnect a cartridge while the OBH-15 MK2 pre-amplifier is powered, as extremely large output signals can be generated. Similarly, do not alter the position of the MC/MM selector switch when the unit is powered on.
RIAA frequency response characteristic to provide accurate reproduction of recording
Circuit design features transistor MC and integrated circuit MM stage
Features multiple gain settings and matching capabilities for capacitance and resistance
Solid aluminum front panel
Black aluminum case is fitted with turned aluminum disc feet and sound absorbing bumpers
Includes clip-on plug adapter for UK, North America, and Europe
In the Box
Creek OBH-15 MK2 Phono Pre-Amplifier
Power Supply Adapter with Clip-On Plug for UK, North America, and Europe
Output at 2 VRMS:
MM (40 dB gain) @ 1 kHz = 0.002%
MM (40 dB gain) @ 10 kHz = 0.003%
MM (50 dB gain) @ 1 kHz = 0.007%
MM (50 dB gain) @ 10 kHz = 0.007%MC
MC (60 dB gain) @ 1 kHz = 0.005%
MC (60 dB gain) @ 10 kHz = 0.005%
MC (70 dB gain) @ 1 kHz = 0.011%
MC (70 dB gain) @ 10 kHz = 0.012%
MM (all gains) 1 kHz, >70 dB
MC (all gains) 1 kHz, >70 dB
0.5 Hz - 100 kHz (+/- 0.5 dB)
MM (40 / 50 dB gain) = 76 / 66 dB
MC (60 / 70 dB gain) = 77 / 70 dB
6.1 VRMs maximum
MM = 40 / 50 dB
MC = 60 / 70 / 80 dB
2 x RCA L/R phono input, MC (moving coil)
2 x RCA L/R phono input, MM (moving magnet)
1 x RCA L/R phono output, line level
1 x 24 VDC barrel, power
Indicators and Controls
1 x LED blue, power
1 x On/off power switch, front panel
1 x MC/MM selector switch, back panel