Rogue Audio Ares II Magnum Tube Phono Preamplifier - Black

The Upgraded Take on Rogue's Tube Phono Stage

The Rogue Audio Ares II Magnum is an MM/MC phono preamplifier built with four vacuum tubes: two 12AX7s and two 12AU7s. It shares its core circuit with the standard Ares II, but adds a set of upgraded internal parts.

Cinemag "blue label" step-up transformers replace the standard part. PRP resistors go in critical spots of the signal path. Mundorf Supreme coupling capacitors handle the inter-stage connections.

Rogue also swaps in Cardas internal wiring and upgraded Cardas RCA jacks. Every one of these changes targets the same goal: a quieter, more accurate signal path.

Rogue describes the result as adding gain headroom for very low output cartridges, along with improved inner detail and accuracy. The standard Ares II remains available too.

It's priced lower, and it's a solid choice for shoppers who don't need the Magnum's upgraded parts.

Heavy, 2-ounce copper circuit boards are used throughout. A fully regulated outboard power supply, built around a toroidal transformer, includes a timer-delayed start to protect the tubes at power-up.

Rogue builds the Ares II Magnum entirely in the USA, the same as the rest of its phono and amplifier lineup.

Three Gain Settings, Finely Matched Components

Gain switches across three levels: 40dB, 55dB, and 64dB. That's the same range as the standard Ares II, covering moving magnet through low-output moving coil cartridges.

Internal settings offer five resistive loading options. Capacitance is selectable at 150pF or 0pF.

A built-in subsonic filter helps tame rumble from a warped record or a turntable prone to footfall. Rogue describes the RIAA equalization as precise, though it doesn't publish an exact tolerance figure for either version.

It measures 17 by 9 by 5.5 inches. It ships at 22 pounds, a pound heavier than the standard Ares II, reflecting its Cardas wiring and upgraded transformers.

Who Is This Preamp Best For?

• Listeners who want the lowest noise floor Rogue's tube phono stage offers. Upgraded transformers, resistors, and coupling capacitors are chosen specifically to lower noise and improve accuracy.
• Owners of very low output moving coil cartridges. Rogue positions the Magnum's upgraded parts as adding useful gain headroom for these cartridges.
• Listeners who want genuine tube sound. All four tubes sit in the actual signal path, not as a marketing accent on a solid-state circuit.
• Collectors who value premium internal parts. Cardas wiring and RCA jacks, Cinemag transformers, and Mundorf capacitors go well beyond typical component choices at this level.
• Not the right fit for anyone on a tighter budget. The standard Ares II shares the same core circuit and gain range at a lower price.

How Does It Connect to Your System?

Run your turntable's phono cable into the Ares II Magnum's RCA input. Connect its RCA output to a line-level input on your amplifier or preamp.

Set the internal gain and loading to match your cartridge before you start listening. Give the tubes a few minutes to warm up for their best sound.

Pairs Well With

Building your system? Here are some great companions for the Rogue Audio Ares II Magnum:

• Turntables without a built-in phono stage
• Moving coil phono cartridges, especially low-output types, matched to its switchable gain
• Interconnect cables to connect its output to your amp

Frequently Asked Questions

How is this different from the standard Ares II?

The core circuit and gain range are the same. The Magnum upgrades key internal parts, including its step-up transformers, resistors, coupling capacitors, wiring, and RCA jacks, aimed at lower noise and better accuracy.

What tubes does it use?

Two 12AX7 tubes and two 12AU7 tubes, the same complement as the standard Ares II. They're user-replaceable, so you can swap in new tubes as they age.

Do I need a separate step-up transformer for a moving coil cartridge?

No. Upgraded Cinemag step-up transformers are built in, handling MC gain without any extra outboard box.

Is the Magnum worth the extra cost over the standard Ares II?

That depends on your cartridge and your ears. Owners of very low output moving coil cartridges, or anyone chasing the lowest possible noise floor, are the ones most likely to hear the difference the upgraded parts make.

What's the warranty?

Rogue Audio covers the Ares II Magnum with a three-year limited warranty, with tubes covered separately for six months.

Why Audio Advisor?

• 40+ Years of Expertise — Since 1981, we’ve helped over a million music lovers find the right gear.
• 60-Day Money-Back Guarantee — Take your time. Listen, enjoy, and make sure it’s right for you.
• Real Experts, Real Help — Our team is here to answer your questions at 800-942-0220, weekdays 9am–6pm EST.
• Free Shipping — On orders over $49, delivered to your door.
• Flexible Payment Options — Financing available so you can start listening now.

Learn More

Want to learn more about tube versus solid-state phono stages, matching a preamp to your cartridge, or getting the most from your vinyl collection? Visit our Learning Center for guides, tips, and expert advice.