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