A MUSE operational amplifier is used in the RIAA equalization amplifier. Polypropylene capacitors have been used in the signal path and in the RIAA equalization circuits. There is selectable input loading for both resistance and capacitance along with two different gain settings located on the back panel making the Fono MC MK4 compatible with most low output MC cartridges. The new Fono MC MK4 circuit resulted from the development work carried out on the hugely successful Aria phono amplifier.

The aesthetic design of the Fono MC MK4 was as important as the quality of its electrical capabilities, so it benefits from the same new aluminium case as the Rega Neo MK2 PSU and Fono MM MK5 phono stage, giving it a design which offers a familiar feel and moreover brings it in line with its illustrious bigger brothers.

Technical Specifications

Output Impedance

200 Ω

Recommended Minimum Output Load Resistance

5 k

Frequency Response (50 kΩ Output Load) 

13 Hz (-3 dB) to 100 kHz (-0.3 dB)

RIAA Accuracy (50 kΩ Output Load)

Better than ±0.2 dB 100 Hz to 100 kHz

Power Requirements

24 V AC at 150 mA maximum

For full technical specifications, download FONO MC MK4 USER MANUAL below.

Load settings for adjustable MC stages

Input Sensitivity (for 200 mV Output)

4 off = 133 uV / 4 on = 67 uV

Input Loading Resistance

1 and 2 off = 400 Ω / 1 on = 100 Ω / 2 on = 150 Ω / 1 and 2 on = 70 Ω

Input Loading Capacitance

3 off = 1000 pF / 3 on = 4300 pF / Gain (at 1 kHz) / 4 off = 63.5 dB / 4 on = 69.5 dB

Maximum Input Level (at 1 kHz)

4 off = 6.7 mV / 4 on = 3.4 mV

Factory settings for all Rega MC cartridges

Impedance 100 Ω / Capacitance 1000 pF / Gain Setting High