Lexicon Signature 284 Stereo Recording Amplifier

Lexicon Signature 284
Lexicon Signature 284 delivers a complete valve signal path in a compact rack format, allowing players and engineers to capture authentic, power-stage-driven tone directly into a recording system or integrate it into larger amplification setups without compromising its distinctive all-tube character.

Lexicon Signature 284 Stereo Recording Amplifier Details

Lexicon Signature 284 is an all-valve stereo instrument amplifier and direct recording system designed to deliver the feel and tone of a fully driven tube guitar amplifier at practical volume levels. Designed by tube specialist John McIntyre, Lexicon Signature 284 combines a high-gain valve preamp with a low-wattage, stereo Class A power amplifier, making it equally suited to recording studios and live performance environments where excessive volume is not desirable. Its architecture allows the entire signal path, from guitar input through the power stage, to contribute to the final tone, whether driving speakers, feeding a recorder, or supplying a slave amplifier.

The preamp section of Lexicon Signature 284 uses three 12AX7 valves and features a switchable high-gain stage along with carefully voiced tone controls including bass, midrange, treble, and presence. This design allows a wide range of tones, from clean and articulate to saturated overdrive, while retaining touch sensitivity. The power amplifier section employs two EL84 valves in a stereo Class A configuration, delivering low-wattage output that can be driven hard without excessive sound pressure levels, ideal for both studio tracking and controlled live use.

A tube-driven stereo effects loop is positioned between the preamp and power amp, allowing true stereo effects processing that cannot be replicated at the console alone. This loop enables time-based and modulation effects to interact directly with the valve stages for more complex and integrated tonal results. Lexicon Signature 284 also provides simultaneous speaker, recording, and slave outputs, all derived post power amp so the complete sonic character of the amplifier is preserved.

The speaker outputs support both 4 ohm and 8 ohm cabinets and include separate passive loads for silent recording when speakers are disconnected. Balanced XLR recording outputs feature built-in speaker simulation, selectable between smooth and bright voicings independently for left and right channels, removing the need for microphones. Slave outputs are also provided for driving external power amplifiers and guitar cabinets when higher stage volume is required. Beyond guitar use, Lexicon Signature 284 can function as a stereo valve processor, allowing synthesizers, samplers, and effects to be routed through the preamp or power amp stages for varying degrees of harmonic coloration and Class A valve warmth.

Features

  • All-valve stereo Class A instrument amplifier and direct recording system
  • High-gain valve preamp with switchable boost and voiced tone controls
  • Low-wattage stereo Class A power amplifier for driven tone at manageable levels
  • Tube-driven stereo effects loop between preamp and power amp
  • Simultaneous speaker, recording, and slave outputs derived post power amp
  • Balanced recording outputs with selectable smooth and bright speaker simulation
  • Built-in passive speaker loads for silent recording
  • Suitable for guitar, harmonica, and studio signal processing applications
  • Fan-cooled 2U rackmount design

Specifications

Released in: 1999
Made in: U.S.A.
  • Preamp Tubes: 3 x 12AX7
  • Gain Control: Pull for boost
  • Tone Controls: Bass, Midrange, Treble, Presence
  • Effects Loop Send: 2 x 6.35 mm unbalanced, -10 dB
  • Effects Loop Return: 2 x 6.35 mm unbalanced, -10 dB
  • Power Amplifier Type: Stereo Class A
  • Power Amp Tubes: 2 x EL84
  • Output Power: 2 x 3 W RMS
  • Power Amp Controls: Left Volume, Right Volume
  • Speaker Outputs: Left and Right, 4 ohm or 8 ohm
  • Recording Outputs: 2 x XLR balanced, +4 dB, with speaker simulation
  • Slave Outputs: 2 x 6.35 mm unbalanced, +4 dB, no compensation
  • Cooling: Fan cooled
  • Dimensions: 89 mm x 483 mm x 267 mm
  • Weight: 10.9 kg
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User Reviews

Lexicon Signature 284 Stereo Recording Amplifier User Reviews

Works great, depending on your expectations

By Pete L.

Sound Quality 100%
Build Quality 100%
Usefullness 100%
Mojo/Funk 70%
Reliability 100%

Having always been interested in comments about this unit over the years from fellow owners, I think sometimes I’m one of the few consistent users of it, or at least who have found its best applications. I’ve had mine since 1998. The difference for me, perhaps, is I never looked it at as anything other than a direct recording device. A couple times when in a live band I ran it into the board and it went into the PA, but otherwise have used the recording outs exclusively going into my DAW.

I think some of the reservations expressed of the 284 stem from hooking it into cabs. I don’t think this is the best function vis a vis the design of it. I use it in a 4CM arrangement with a tc electronic G-Major 2, but have also used other effects unit similarly. There are two tones I’m after: 1) a clean, stereo tone suitable for arpeggiated notes, where I use none of its distortion capabilities, and 2) a high gain, singing lead tone, where I have various booster/distortion pedals before the input. I think the amp takes the boost from these pedals well, and it even works for distorted chords where you may not be looking for a “chug” effect, but more like an progressive rock articulated tone.

I adjust the master and individual (stereo) volumes together to adjust my output levels and usually don’t use the preamps internal boost, which is activated by pulling out the main volume knob. But you can do that for more sustain if you want, but I feel it dirties up the tone too much. There can be quite a bit of gain if you want it. I like to roll off a bit of the high end on my leads when mixing.

Because it’s a tube amp, it gets great harmonics and responds to attack very well. I also think certain effects should only be heard in stereo, and really like that capability of the 284. So…no losses from microphones and another preamp stage, silent recording if you need it, and a thick, very tube-y distortion. The 284 has remained my primary source for recording solos.

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The details provided above are drawn from historical documents like advertising brochures or user manuals. They’re shared without bias or review. This info is given solely for your consideration, helping you gauge its usefulness to you.

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