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Rogue Audio Cronus Magnum III Integrated Amplifier
The Rogue Audio Cronus Magnum III is an all-tube integrated amplifier delivering 100 watts per channel, with a built-in phono stage, headphone amplifier, and the ability to switch between ultralinear and triode modes on the fly. It's designed and hand-built in Brodheadsville, Pennsylvania, and it sounds like it.
The Cronus Magnum III pairs a pure tube triode preamplifier with Rogue's Atlas Magnum power amplifier circuit. The preamp section uses 12AX7 and 12AU7 tubes to shape the signal before handing it off to four KT88 output tubes that produce 100 watts per channel. The large, oversized linear power supply with slow-start sequencing provides stable, clean power to the entire circuit, and short signal paths keep the noise floor low. This is the same fundamental architecture that earned the Cronus line its reputation, refined over three generations.
A front-panel switch lets you choose between two operating modes. Ultralinear mode delivers the full 100 watts per channel with a commanding grip on bass and dynamic authority for demanding passages. Triode mode drops to 60 watts per channel but offers a softer, more harmonically rich sound with a wider, more dimensional soundstage. Most listeners settle on one mode for a given pair of speakers, but having both means you can optimize for different recordings or listening moods without swapping gear.
The phono section was completely redesigned for the Mark III and is one of the most capable built-in phono stages at this price point. It accommodates both MM and MC cartridges with two gain settings (45dB and 60dB) and five individual load settings, so you can properly match your cartridge without needing a separate phono preamp. RIAA accuracy is +/- 0.1dB from 20Hz to 20kHz. If you're running a turntable as your primary source, this is a significant advantage over competitors that either skip the phono stage or tack on an afterthought. For a dedicated external option with even more flexibility, see our Rogue Audio Ares II Phono Preamplifier.
The headphone circuit is based on Rogue's standalone RH-5 headphone amplifier, using MOSFET buffers to deliver 2 watts of clean, high-current output. It's a simplified single-ended version of the RH-5 circuit and drives demanding headphones properly, not just a token jack on the front panel.
The Dark edition builds on the standard Cronus Magnum III with component upgrades throughout the signal path:
With 4-ohm and 8-ohm output taps, the Cronus Magnum III pairs well with a wide range of speakers. It has enough power for moderately efficient floorstanders and the finesse for high-sensitivity designs. The buffered variable outputs let you add a subwoofer or bi-amp without compromising the main signal. Four line-level inputs plus the phono stage cover most source configurations, and the aluminum remote handles volume and mute.
If you need more power or want to separate your amplification, consider the Atlas Magnum III power amp paired with an RP-7 or RP-9 preamplifier. For a hybrid approach with solid-state output, the Pharaoh II is worth a listen.
We're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on trust, not hype. We've carried Rogue Audio for years because their products deliver real value and hold up over time. Every component is designed and built in Pennsylvania, and we're proud to support a manufacturer that shares our commitment to quality. Whether you're visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction.
| Performance | |
| Power Output | 100 WPC (Ultralinear) / 60 WPC (Triode) |
| Frequency Response | 5Hz - 30kHz (+/- 1dB) |
| Tube Complement | 2 x 12AX7, 3 x 12AU7, 4 x KT88 output tubes |
| Output Taps | 4 ohm and 8 ohm |
| Phono Stage | |
| Gain | 45dB / 60dB (selectable) |
| RIAA Accuracy | +/- 0.1dB, 20Hz - 20kHz |
| Cartridge Compatibility | MM and MC, 5 load settings |
| Headphone Amplifier | |
| Output Power | 2W (MOSFET buffers) |
| Connections | |
| Inputs | 4 gold-plated RCA (Phono, Line 1, Line 2, Line 3) |
| Speaker Outputs | Gold-plated binding posts (4 and 8 ohm taps) |
| Other Outputs | Buffered variable outputs, active outputs for subwoofer/bi-amping |
| Construction | |
| Power Supply | High-storage linear supply with slow-start sequencing |
| Circuit Board | Heavy (2 oz) copper with precision components |
| Faceplate | Machined aluminum |
| Remote Control | Aluminum remote (volume and mute) |
| Power Cord | Detachable IEC |
| Power Requirements | 120V - 50/60Hz |
| Physical | |
| Dimensions | 18" W x 17.5" D x 6.75" H |
| Shipping Weight | 55 lbs |
| Warranty | 3 years (6 months on tubes) |
| Country of Origin | Designed and handcrafted in the USA |
"Spoiler alert, I love this amp!" "A terrific-sounding, all-tube integrated amp that is so musically engaging, such a joy to use, and such a superb value." "Warm sounding but not fat; it is airy; its resolution is plenty satisfying. It is simply very, very good."
,The Absolute Sound · January 2023
"Rogue Audio's Cronus is a very serious and convincingly constructed component; I didn't see any signs of money saving cost cutting construction anywhere." "The Cronus Magnum III projects a large and tonally rich panorama that I find satisfying involving and natural." "The sound is full of natural resonant harmonic overtones both odd and even." "The performance of Rogue Audio's Cronus Magnum III is very easy to listen to and satisfying in both modes. I could easily build a very rewarding system around this integrated amplifier with phono stage."
,Enjoy the Music · May 2019
"The Rogue Audio Cronus 3 doesn't just sound as good as it did 10 years ago, it actually sounds a heck of a lot better. And you know what? Given the advancements, it should." "Without question, this reasonably priced tube amplifier sounds good enough to me that I could easily put another decade on this thing and leave the upgrading merry-go-round for the suckers out there."
"I'll tell you what, these speakers, the JBL L100s, haven't even sounded better with any other equipment I've been using them on. It sounded fantastic." "This unit has a retail of $29.95 and it's built here in the USA. USA quality, USA build, outstanding."
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