Rega Fono MM MK5

Decision Profile · L2 · documentation + editorial inference

Rega Fono MM MK5

A dedicated analogue MM phono stage with fixed gain and loading for a line-input amplifier; it is not a low-output MC preamplifier or a USB recorder.

Evidence checked / updated: 2026-10-11. Manufacturer claims and editorial system-fit assessment. No SoundPath Lab listening or measurement test.

Verified documentation

• Input and gain: 47kΩ in parallel with 100pF; 41.4dB gain at 1kHz. Sensitivity 1.7mV for 200mV output; maximum input 60mV at 1kHz. Manufacturer values.
• Output conditions: 200Ω output impedance; recommended load at least 5kΩ. Frequency response into 50kΩ: 15Hz (-3dB) to 100kHz (-0.2dB). Official RIAA accuracy is better than ±0.2dB from 100Hz to 100kHz into 50kΩ; the broad upper bound is retained as published, not SPL measured.
• Connectivity and power: Stereo RCA phono input and line output; 24V AC supply, maximum 80mA. Use the specified AC adaptor, not an arbitrary DC replacement.

Best for

A compatible MM cartridge and amplifier or active-speaker controller lacking a phono input.

Avoid if

You require low-output MC gain, adjustable loading, line-input switching, speaker drive or digital recording.

Limits and unknowns

Loading and gain are fixed. Total cartridge capacitance also includes arm and interconnect capacitance; this unit alone cannot validate the cartridge match or eliminate hum.

Current verdict

A dedicated analogue MM phono stage with fixed gain and loading for a line-input amplifier; it is not a low-output MC preamplifier or a USB recorder.

Why it fits

A compatible MM cartridge and amplifier or active-speaker controller lacking a phono input.

What it can replace

A compatible existing device performing this documented role, when a real connection or workflow requirement is missing. Check downstream levels, space and total system cost before replacing it.

What it cannot replace

You require low-output MC gain, adjustable loading, line-input switching, speaker drive or digital recording.

What SoundPath Lab tested

Official model documentation and the linked manual were reviewed. No SoundPath Lab unit was listened to, measured, installed or firmware-retested for this revision. L2 identifies decision coverage, not independent testing or a product score.

What remains untested

Actual sound, electrical or acoustic performance, unit variation, compatibility in the proposed system, long-term reliability and remedy outcomes remain untested. Owner cases were not collected in this revision. Manufacturer specifications must not be treated as SPL results.

System conditions

Check cartridge gain/loading requirements, connect phono input to the deck and line output to AUX/line rather than another phono input. Keep signal cables away from mains sources and confirm ground arrangements in the actual system.

Alternatives by need

Keep an integrated MM stage if it already works without overload or noise. Planar 1 and Planar 2 are upstream turntables that need this role, not alternative phono stages.

Keep or upgrade

Keep working equipment if it meets these requirements. Upgrade for a missing function, appropriate physical fit or a documented system constraint; no audible superiority is established here. Audition or validate the intended chain before committing to a replacement.

When to reassess

Reassess after revised official specifications, hardware configuration changes, a relevant verified issue, support withdrawal or independently accepted tests. A routine product-page edit does not justify a maturity change or issue closure.

Ownership evidence

Long-term ownership evidence is pending; no six-month listening, durability or reliability result is claimed.

Firmware, manual and support

The official page links the model manual and describes a limited lifetime manufacturing-defect warranty. Consumables and wear are excluded and country terms may vary; confirm with the authorised local dealer. These analogue models have no documented user firmware or subscription dependency.

Current local price, stock, regional warranty terms, repair lead time and guaranteed future support period are Unknown. An accessible official page is not evidence of local stock. Confirm the exact offer and service terms before purchase.

Official model manual

Related records

• Rega Planar 1
• Rega Planar 2
• Product directory
• Product issues and limitations
• Firmware and app tracker
• Truth and risks

Primary sources

• https://www.rega.co.uk/products/fono-mm-mk5 — official documentation, checked 2026-10-11
• https://www.rega.co.uk/download/fono-mm-user-MK5-manual-ml-01.pdf — official documentation, checked 2026-10-11

Revision record

2026-10-11 — Promoted from L0 to L2 after full Decision Profile review. Stable product identity retained; source conflicts and untested behavior remain visible. L2 is evidence coverage, not independent test acceptance or automatic recommendation.