Acoustic Sounds

MoFi Electronics


By: Michael Fremer

August 23rd, 2023

A Short "Video Tour" of MoFi Electronics' MasterPhono MM/MC Phono Preamplifier

A detailed inside look

I figured before boxing it up and returning the MoFi Electronics MasterPhono I'd remove the top cover and give you a short guided tour.


Input: Current mode & Voltage mode, balanced and unbalanced
Gain: Selectable gain for MM or MC 40db, 50db, 60db, 70db
   10mV@1KHZ MM low: 0.005% A-Weighted
   10mV@1KHZ MM high: 0.005% A-Weighted
   1mV@1KHZ MC low: 0.010% A-Weighted
   1mV@1KHZ MC high: 0.013% A-Weighted
Loading: 15 Ohms, 30 Ohms, 50 Ohms, 75 Ohms, 100 Ohms, 500 Ohms, 1K Ohms, 10K Ohms, 47K Ohms+150pF, & "Custom"
Output Impedance:
   Balanced: 230 Ohm
   Unbalanced: 115 Ohms
Max Output: @1% THD, 10 Volts RMS
RIAA Accuracy: +/-0.05db
Frequency Response: 10Hz – 50KHz +/-0.20db
S/N ratio (20Hz-20KHz):
   Balanced MM: 85db, 93db
   Balanced MC: 81db, 85db
   Unbalanced MM: 75db, 83db
   Unbalanced MC: 69db, 75db
Dimensions: 17.5" x 3.5" x 15.75"
Weight: 15 lbs.

Manufacturer Information

MoFi Electronics

1811 Bryn Mawr Ave.

Chicago, Ill.