X-Tube
Key Features
- 12AX7 vacuum tube amplifier circuit simulation with authentic harmonic saturation characteristics
- 64-bit floating point audio processing with true zero-latency operation
- Oversampling from 1x to 16x for aliasing-free saturation at any quality level
- 3-band IIR equalizer with +/-12dB range for integrated tone shaping
- Separate drive and bias controls for precise tube operating point adjustment
- Mono, stereo, quadro, and 5.1 surround channel support
- 12 factory presets plus 8 user-saveable preset slots
Description
X-Tube by Xenium Audio is a real-time simulator of a single-stage 12AX7 vacuum tube amplifier. It models the harmonic saturation behavior of one of the most widely used preamp tubes in recording history, adding warmth, grit, and analog character to digital audio signals.
The plugin processes audio at 64-bit floating point precision with zero latency, making it suitable for both mixing and live monitoring. Oversampling options range from 1x to 16x, allowing you to dial in the tradeoff between CPU load and aliasing-free saturation quality.
A built-in 3-band IIR equalizer with a +/-12dB range per band lets you shape the tone before or after saturation. Separate drive and bias controls give precise command over how hard the virtual tube is pushed and where it sits on its operating curve.
X-Tube supports mono, stereo, quadro, and 5.1 surround channel configurations, handling everything from individual vocal tracks to full surround mixes. It ships with 12 factory presets and 8 user-saveable slots for quick recall.
The interface is deliberately simple, prioritizing fast workflow over visual flash. At under 400 KB installed, it runs efficiently even on older systems, though higher oversampling settings will increase CPU demand on any machine.
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Frequently Asked Questions
What tube does X-Tube emulate?
X-Tube models a single-stage 12AX7 (also known as ECC83) vacuum tube amplifier. The 12AX7 is one of the most common preamp tubes found in guitar amplifiers, studio preamps, and hi-fi equipment, known for producing rich even-order harmonics and smooth saturation.
How does the oversampling setting affect performance?
X-Tube offers oversampling rates from 1x to 16x. Higher settings reduce aliasing artifacts in the saturation for cleaner results but increase CPU usage. For mixing, 4x or 8x is a good balance. Use 1x for tracking with minimal latency and 16x for final rendering when CPU load is not a concern.
Can X-Tube process surround sound?
Yes. X-Tube supports mono, stereo, quadro, and 5.1 surround channel configurations. This makes it usable on individual tracks, stereo buses, and surround mixing sessions without needing multiple plugin instances.
What is the difference between the drive and bias controls?
The drive control sets how hard the audio signal pushes into the virtual tube, determining the amount of saturation and harmonic distortion. The bias control adjusts the tube's operating point on its transfer curve, which changes the character of the distortion from symmetrical to asymmetrical clipping.
