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Rogue Audio RP-9 v2 Preamplifier
The Rogue Audio RP-9 v2 is the flagship preamplifier in Rogue's lineup, built around four 6H30P tubes instead of the 12AU7 used throughout the rest of the RP series. The 6H30P is a high-transconductance dual triode originally developed for Soviet military and telecommunications applications, offering lower noise, wider bandwidth, and higher linearity than the 12AU7. The result is a frequency response stretching from 5Hz to 170kHz, fully balanced XLR connectivity, and a 2-watt tube headphone amplifier, all in a 30-pound full-chassis platform handcrafted in Brodheadsville, Pennsylvania.
Every other preamplifier in the Rogue RP series uses 12AU7/ECC82 tubes. The RP-9 uses 6H30P tubes, and that choice defines its character. The 6H30P (also designated 6H30Pi or 6N30P) is a high-transconductance, low-impedance dual triode originally developed for Soviet military radar and telecommunications equipment in the 1970s. Its electrical characteristics differ fundamentally from the 12AU7: higher transconductance produces more gain per stage, lower plate resistance reduces output impedance, and the tube's inherently wide bandwidth extends the RP-9's frequency response to 170kHz (compared to 100kHz for the 12AU7-based RP-7). The lower internal impedance also reduces the tube's sensitivity to microphonics, external vibration, and electromagnetic interference. The 6H30P typically lasts longer than 12AU7 tubes in normal preamp service. Replacement tubes are readily available from multiple manufacturers.
Four 6H30P tubes are arranged in two mu-follower pairs in a balanced differential configuration optimized for linearity and dynamics. The circuit delivers 14dB of gain through the RCA outputs and 20dB through the balanced XLR outputs, matching the RP-7's gain structure but with the 6H30P's wider bandwidth and lower noise floor contributing to a different sonic presentation. Maximum output is 30V, and the output impedance is below 10 ohms, ensuring the RP-9 drives any power amplifier cleanly regardless of input impedance or cable length. Total harmonic distortion is below 0.1% across the operating band. The slow-start sequencing and auto-mute at power on and off protect the tubes and downstream components.
The RP-9 provides two pairs of balanced XLR inputs and two pairs of balanced XLR outputs, enabling a fully balanced signal path from source through power amplification. The dual balanced outputs allow simultaneous connection to two power amplifiers or a stereo amplifier and subwoofer amplifier without signal splitting. Three pairs of single-ended RCA inputs, two pairs of variable RCA outputs, and one pair of fixed RCA outputs handle single-ended sources and connections. The home theater bypass accepts surround processor signals at unity gain, and the processor loop inserts external signal processors into the path. The mono button collapses the stereo signal for mono recordings.
The RP-9 includes the most powerful headphone amplifier in the RP series: a 2-watt tube-based circuit that drives demanding planar magnetics and high-impedance dynamic headphones with authority. That 2 watts is double what the RP-1 v2 delivers and represents a serious headphone amplifier in its own right. The tube preamp section feeds the headphone output, so headphone listening benefits from the full 6H30P signal path. For a dedicated headphone station with balanced outputs, the RH-5 Headphone Amplifier offers 3.5 watts with both single-ended and balanced connections.
The RP-9's remote control is a machined aluminum unit with 10 buttons, the highest-grade remote in the RP series. The RP-1 v2 ships with a 7-button plastic remote, the RP-3 and RP-5 with 10-function plastic remotes, and the RP-7 with a metal remote. The RP-9's machined aluminum version reflects its flagship positioning. The defeatable OLED display shows volume, source, and balance, with 0.5dB volume steps for fine-grained adjustment at low listening levels.
The RP-9 v2 is the flagship of Rogue Audio's preamplifier lineup:
The RP-9 shares its gain structure, output capability, and output impedance with the RP-7. The fundamental difference is the tube complement: 6H30P versus 12AU7. The 6H30P's wider bandwidth (170kHz vs 100kHz), lower noise, and different harmonic character make the RP-9 a distinct instrument rather than simply a more expensive RP-7. For turntable-centric systems, pair the RP-9 with the Ares II Phono Preamplifier for a fully Rogue phono front end.
The RP-9 v2 pairs naturally with Rogue's pure tube power amplifiers. The M-180 Monoblocks deliver 180 watts of Apollo-derived tube power with switchable triode/ultralinear operation, fully balanced connectivity, and Stereophile Class A recognition.
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 | |
| Tube Complement | 4 x 6H30P |
| Circuit Topology | Balanced differential mu-follower |
| Line Stage Gain | 14dB (RCA) / 20dB (XLR) |
| Frequency Response | 5Hz to 170kHz (+/-1dB) |
| THD | <0.1% |
| Rated Output | 1V |
| Maximum Output | 30V |
| Output Impedance | <10 Ohms |
| Headphone Amplifier | |
| Output Power | 2W |
| Design | Tube-based |
| Connections | |
| RCA Inputs | 3 x line-level |
| XLR Inputs | 2 x fully balanced |
| RCA Variable Outputs | 2 pairs |
| RCA Fixed Output | 1 pair |
| XLR Outputs | 2 pairs fully balanced |
| Home Theater Bypass | Yes (unity gain) |
| Processor Loop | Yes |
| Controls | |
| Volume Steps | 0.5dB increments |
| Display | OLED (defeatable) |
| Remote Control | 10-button machined aluminum (included) |
| Mono Button | Yes |
| Construction | |
| Power Requirements | 120/240V, 50/60Hz |
| Dimensions | 18.5" W x 4.5" H x 17" D |
| Weight | 30 lbs |
| Warranty | 3 years (6 months on tubes) |
| Country of Origin | Handcrafted in the USA |
Rating: 5/5 Blue Notes | Award: Best of 2021 Blue Note Equipment Award "I was amazed that the sound could be that much better than my RP-7, which I felt was wonderful." "Rogue Audio's RP-9 vacuum tube stereo preamplifier is magical!" "The bass seemed to go lower by an octave because what was previously heard now had better definition and authority." "The price of admission into the realm of the RP-9 is justifiable given the payoff."
,Enjoy the Music · May 2021
Rating: 9.5/10 LPs "The ability of the Rogue preamp to keep up with the demands of the music signal is unquestionable." "Sounds have greater body and depth. The midrange is not highlighted or more forward, but it is more densely populated." "The Rogue preamp sounds similar to the Soulution 325, $13,000, but the RP-9 is much better focused and 3-dimensional." "The RP-9 has humanity." "Is this component worth your time? The answer is Yes!"
,10 Audio · August 2022
