The OBH-8mk2 has a completely new circuit design, utilising an integrated circuit MM stage. The signal required by most modern amplifiers is described as ‘LINE’ level which ranges from 200 mV and 500 milli-Volts sensitivity, with a flat frequency response. Unless your amplifier has a specific ‘Phono’ or Disc input, the level will be too low to play vinyl and the frequency response will be wrong. Hence the need for a Phono pre-amp.
The OBH-8mk2 is small device designed to boost the signal level by 40dB (x100) and change the frequency response to provide the most accurate reproduction of the recording.
To enhance the performance, the power supply is split into a negative and positive voltage by a custom Creek discrete circuit. Two capacitance multipliers further filter the power supply, before they power the pre-amp circuitry, to reduce any unwanted ripple to virtually nothing. To reduce distortion Creek has also fitted constant current sources to the output of the gain stage, pushing it into Class A. This combined with a low output impedance make it suitable for driving long cables with ease.
The OBH-Uni is a multi-region, 24V, 0.5A power supply adaptor.
Creek originally developed this power adaptor to simplify the requirements for selling OBH products in all countries. However, extensive listening tests and comparisons proved that this high efficiency regulated power adaptor can also extract the best performance from Creek’s OBH-15mk2 and OBH-8mk2 Phono Pre-amps, which have high-gain and are therefore more demanding of power supply purity. It is over-rated and can provide 4 times more power than is required to power a Phono pre-amp.
Strict international regulations make it unacceptable to use conventional linear power adapters because, if they are left permanently switched-on, their standby power will exceed the 0.1W limit. The latest OBH-Uni draws less than 0.1W when idle, or plugged-in but not used. It is also silent in operation, from zero to maximum current consumption.
- THD & noise at 2vrms output: (40dB gain) @1kHz to 10kHz=<0.003%
- Channel separation: >70dB
- Frequency response: 10Hz-100kHz (+/-0.5dB)
- SNR: >76dB
- Overload margin: >21dB
- Output level: 6.1v RMS maximum
- Output impedance: <100 Ohms
- Gain: 40dB fixed
- Matching: Resistance=47k Ohms. Capacitance=220pF
- Size: 100x48x80mm WxHxD
- Weight: 0.4kgs inc OBH-Uni power adapter
- Power consumption: 3 Watts
- Mains voltages: 100v to 250v AC 50/60Hz
- Mains connection: A clip-on plug is supplied for UK, North America and Europe
- Finish: Black only