UltraPhono Pro
The UltraPhono Pro is an all-analog, single-input phono preamplifier based on the core design of MoFi's MasterPhono. It suits vinyl listeners who want front-panel gain and loading adjustment for their cartridge.
- Single-input all-analog phono stage derived from MasterPhono
- Discrete J-FET and MOSFET gain stage
- Passive zero-feedback RIAA network, ±0.05 dB accuracy
- Front-panel gain and loading controls
- Mono, subsonic, mute and dim functions
- Seven-stage regulated balanced power supply
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The UltraPhono Pro takes the core circuit design of the MasterPhono flagship and applies it to a single-input phono stage, developed with audio engineer Peter Madnick. It uses a fully discrete J-FET and MOSFET gain stage and a passive RIAA equalization network with no feedback, with precision film-foil parts holding RIAA accuracy to ±0.05 dB.
Gain and cartridge loading are set from the front panel. Three gain settings and five loading values cover a range of cartridges, and listening controls for mono, subsonic filtering, mute and dim are provided. A seven-stage regulated balanced power supply is used to keep noise low.
The input is a single-ended RCA jack in voltage mode. Outputs are available as RCA (unbalanced) and balanced, with different gain values for each. The chassis combines brushed-aluminum panels with a rigid steel frame.
Video
Specifications
- Brand
- MoFi Electronics
- Model
- UltraPhono Pro
- Category
- Hi-fi and home audio › Other hi-fi
Inputs
- Input
- RCA jack, voltage mode, single-ended
- Loading
- 100 Ohms, 300 Ohms, 500 Ohms, 1k Ohms, 47k Ohms
Outputs
- Output impedance (balanced)
- 230 Ohms
- Output impedance (unbalanced)
- 115 Ohms
- Max output @1% THD
- 10 Volts RMS
Audio
- Gain (RCA output)
- 40dB, 52dB, 65dB
- Gain (balanced output)
- 46dB, 58dB, 71dB
- THD 10mV@1kHz, 40dB gain
- 0.005% A-Weighted
- THD 10mV@1kHz, 65dB gain
- 0.005% A-Weighted
- THD 1mV@1kHz, 40dB gain
- 0.010% A-Weighted
- THD 1mV@1kHz, 65dB gain
- 0.013% A-Weighted
- RIAA accuracy
- ±0.05dB
- Frequency response
- 10Hz–50kHz ±0.20dB
- S/N ratio, balanced 40dB gain (20Hz–20kHz)
- 82dB, 93dB
- S/N ratio, balanced 65dB gain (20Hz–20kHz)
- 78dB, 85dB
- S/N ratio, RCA 40dB gain (20Hz–20kHz)
- 75dB, 83dB
- S/N ratio, RCA 65dB gain (20Hz–20kHz)
- 69dB, 75dB
Features
- Gain stage
- Fully discrete J-FET & MOSFET input/output stages
- RIAA equalization
- Passive, zero feedback
- Power supply
- Seven-stage regulated balanced power supply
- Front-panel controls
- Gain, loading, mono, subsonic, mute, dim
Physical
- Dimensions
- 17" x 2.5" x 11.35"
- Weight
- 7 lbs
- Construction
- Brushed-aluminum panels with rigid steel frame