# Mesa/Boogie Rectifier
The Mesa/Boogie Rectifier series is a family of high-gain all-tube guitar amplifiers made by MESA/Boogie of Petaluma, California, introduced in the early 1990s with the Dual Rectifier Solo Head and named for its switchable power-supply rectification between vacuum tubes and silicon diodes. The Dual Rectifier became one of the defining amplifiers of 1990s rock and metal, and the [Rectifier](https://www.edgepedia.org/rectifier) line grew to include three-channel heads, the 50-watt Single Rectifier, the Roadster, the Road King, and a Mini Rectifier.
| Key fact | Detail |
|---|---|
| First model | Dual Rectifier Solo Head, a 100-watt, two-channel head; Mesa's own history dates the release to 1991, while Guitar World reports the official introduction as February 1992[1](https://legacy.mesaboogie.com/tubes/rectifier-tubes/index.html) • [2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar) |
| Name origin | The amp offers two forms of power rectification, tube (5U4) or silicon diode, selected by a rear-panel Rectifier Select switch[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar) • [3](https://gridleak.app/versions/mesa-boogie-rectifier) |
| Original configuration | 100-watt head with two switchable channels and three voices: Clean, Orange/Crunch, and Red/Distortion; four 6L6 power tubes and a diamond-plate faceplate[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar) • [3](https://gridleak.app/versions/mesa-boogie-rectifier) |
| Commercial weight | From 1993 to 2004 the Rectifier amps were over half of Mesa's business, according to R&D Director Doug West[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar) |
| Rectifier tubes in use | In the 50-watt setting one 5U4 rectifier tube is used; in the 100-watt setting two 5U4s are activated[4](https://www.manualslib.com/manual/525258/Mesa-Boogie-Dual-And-Triple-Rectifier.html) |
| Key patents | Recto Tracking (Patent 7,193,458) and the Multi-Watt channel-assignable power amp (Patent 7,602,927)[5](https://legacy.mesaboogie.com/amplifiers/electric/rectifier-series/dual-rectifier/head.html) |
| Line milestones | 1992 two-channel Dual Rectifier, 2001 three-channel version, 2004 Road King Series 2, 2011 Mini Rectifier[6](https://production.mesaboogie.com/about/index.html) • [7](https://www.rig-talk.com/forum/threads/the-history-of-the-mesa-boogie-rectifier.14419/) |
## Development and release
Mesa began work on the Dual Rectifier in 1989, when competition from companies such as Soldano and a growing group of amp modifiers turned boutique builders was intensifying. The company developed two prototype circuits, Revisions A and B, before settling on the Revision C circuit. Doug West, Mesa/Boogie's R&D Director, said the amp was originally aimed at the late-Eighties hair metal crowd, but by the time it was finished the grunge era had begun; the shift in music turned out to suit the amp, and from 1993 to 2004 the Rectifier Series accounted for over half of Mesa's business[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar).
Mesa's own account dates the Dual Rectifier's release to 1991, describing it as the amplifier that redefined high gain and brought a resurgence in the use of rectifier tubes for a vintage string-feel[1](https://legacy.mesaboogie.com/tubes/rectifier-tubes/index.html). [Guitar World](https://www.edgepedia.org/guitar-world) places the official introduction in February 1992[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar).
## Switchable rectification
A rectifier in a guitar amplifier converts the AC voltage from the power source into the DC current used by the amp's internal circuitry[1](https://legacy.mesaboogie.com/tubes/rectifier-tubes/index.html). The Dual Rectifier's name comes from offering two types of this conversion: silicon diodes for a modern, tight, fast attack, or a 5U4 vacuum tube for a smoother, vintage-style attack and sag, chosen with the Rectifier Select switch[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar). Mesa's manual describes the tube setting as producing a looser, saggier response with enhanced harmonics, and the diode setting as tightening the response and producing the highest power, keeping the sound tight and percussive[8](https://mesa-boogie.imgix.net/media/User%20Manuals/3chRecto_multiWatt.pdf).
The rectifier tubes also interact with the power setting: in the 50-watt setting one 5U4 is used for the saggiest, most clippable power, while the 100-watt setting activates two 5U4s for a higher-output vintage-inspired power voice[4](https://www.manualslib.com/manual/525258/Mesa-Boogie-Dual-And-Triple-Rectifier.html). Later models added Mesa's patented Recto Tracking circuitry (Patent 7,193,458) for the selectable, channel-assignable dual rectification[5](https://legacy.mesaboogie.com/amplifiers/electric/rectifier-series/dual-rectifier/head.html).
## Features of the original head
Manufactured between 1992 and 2000, the first Dual Rectifier was a 100-watt amplifier head offering two channels that could be switched between, along with three voicing options: Clean, Orange/Crunch, and Red/[Distortion](https://www.edgepedia.org/distortion). Other features included a Bias Select switch for swapping between 6L6 and EL34 power tubes, a Bold/Spongy switch that works like a built-in Variac by lowering the incoming AC line voltage for additional sag, and a Channel Cloning switch that makes the two channels closely resemble each other. Initial production models from 1992 to 1994 had a series effects loop, which changed to a parallel effects loop with Revision G in 1994[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar).
The Bold/Spongy power switch, described by Mesa as a built-in Variac, switches the incoming AC line voltage down to approximately 95 volts for additional sag and a looser feel with raised upper harmonics[8](https://mesa-boogie.imgix.net/media/User%20Manuals/3chRecto_multiWatt.pdf).
## Later models in the series
The Rectifier line expanded through several related designs, all evolutions of the original Solo Head circuit:
- **Single Rectifier 50**: a 50-watt, diode-rectified two-channel head that stepped the Dual Rectifier's circuitry down to a single pair of power tubes, sold as the Solo 50 and Rect-O-Verb 50[9](https://legacy.mesaboogie.com/support/out-of-production/solo-50-head-single-recto.html).
- **Three-channel Dual and Triple Rectifier**: introduced in 2001, adding a third gain channel and, in the Multi-Watt versions, Mesa's patented Multi-Watt power amp (Patent 7,602,927), which lets each channel be assigned 50 watts on two power tubes or 100 watts on all four[7](https://www.rig-talk.com/forum/threads/the-history-of-the-mesa-boogie-rectifier.14419/) • [5](https://legacy.mesaboogie.com/amplifiers/electric/rectifier-series/dual-rectifier/head.html).
- **Road King and Roadster**: the Road King Series 2 appears in Mesa's timeline in 2004, and the Dual Rectifier Roadster uses the Multi-Watt feature to choose 50 or 100 watts per channel[6](https://production.mesaboogie.com/about/index.html) • [10](https://subway.mesaboogie.com/amplifiers/electric/rectifier-series/roadster/index.html).
- **Mini Rectifier**: a compact model added in 2011[6](https://production.mesaboogie.com/about/index.html).
## Sound and influence
Guitar World credits the Dual Rectifier with a larger role than any other single product in defining the sound of 1990s rock[2](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar).
Players adopted the amp across rock and metal. Soundgarden's [Kim Thayil](https://www.edgepedia.org/kim-thayil) used a Mesa/Boogie Rectifier endorsement deal in the 1990s, setting the amp's modern, classic, and standard modes to standard or classic to get a warmer sound closer to an old Fender Tweed[11](https://www.guitarworld.com/artists/guitarists/kim-thayil-soundgarden-a-screaming-life). The amp's circuit has also been widely modeled; the Universal Audio Knuckles plugin simulates the Dual Rectifier amp and speaker[12](https://www.musicradar.com/guitars/electric-guitars/gretsch-electromatic-cvt-baritone-review).
## Reissue
After Gibson acquired Mesa/Boogie, the company released the 90s Dual Rectifier, a recreation of the original two-channel Solo Head with its Vintage/Orange and Modern/Red overdrive modes plus an improved clean mode, hand-wired in [Petaluma, California](https://www.edgepedia.org/petaluma-california). It retains the Rectifier Select switch between silicon diode and tube rectification and the Bias Select switch for 6L6 or EL34 power tubes[13](https://mesa-boogie.imgix.net/137154_90s-Dual-Rectifier_241105.pdf).
## References
1. [Rectifier Tubes, MESA/Boogie](https://legacy.mesaboogie.com/tubes/rectifier-tubes/index.html)
2. [How the Mesa/Boogie Dual Rectifier defined the high-gain guitar sound of the 1990s, Guitar World (Chris Gill, 3 May 2024)](https://www.guitarworld.com/features/how-the-mesa-boogie-dual-rectifier-defined-90s-rock-guitar)
3. [Mesa/Boogie Rectifier: every version, how to date it, what to check, Gridleak](https://gridleak.app/versions/mesa-boogie-rectifier)
4. [MESA/Boogie Dual & Triple Rectifier Owner's Manual, ManualsLib](https://www.manualslib.com/manual/525258/Mesa-Boogie-Dual-And-Triple-Rectifier.html)
5. [Dual Rectifier 100 Watt Head, MESA/Boogie](https://legacy.mesaboogie.com/amplifiers/electric/rectifier-series/dual-rectifier/head.html)
6. [Excellence; A Way of Life, MESA/Boogie](https://production.mesaboogie.com/about/index.html)
7. [The History of the Mesa/Boogie Rectifier, Rig-Talk](https://www.rig-talk.com/forum/threads/the-history-of-the-mesa-boogie-rectifier.14419/)
8. [Multi-Watt Dual & Triple Rectifier Operating Instructions, MESA/Boogie](https://mesa-boogie.imgix.net/media/User%20Manuals/3chRecto_multiWatt.pdf)
9. [Single Rectifier 50 Series 2, MESA/Boogie](https://legacy.mesaboogie.com/support/out-of-production/solo-50-head-single-recto.html)
10. [Dual Rectifier Roadster, MESA/Boogie](https://subway.mesaboogie.com/amplifiers/electric/rectifier-series/roadster/index.html)
11. [Kim Thayil on how Soundgarden took rock guitar into the superunknown, Guitar World](https://www.guitarworld.com/artists/guitarists/kim-thayil-soundgarden-a-screaming-life)
12. [Gretsch Electromatic CVT Baritone review, MusicRadar](https://www.musicradar.com/guitars/electric-guitars/gretsch-electromatic-cvt-baritone-review)
13. [90s Dual Rectifier Owner's Manual, MESA/Boogie](https://mesa-boogie.imgix.net/137154_90s-Dual-Rectifier_241105.pdf)
---
*Topic: Encyclopedia › Technology and the built world › Communications and everyday technology › Broadcast engineering and radio equipment › Broadcast transmitters › Broadcast exciters and modulators*
*Initially written Sep 17, 2026 · Reviewed: Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license