Whitestone Audio P331 WH Tube Loading Amplifier

Versatile, High-Fidelity Tube Loading Amplifier for Professional Engineers

The Whitestone Audio P331 WH Tube Loading Amplifier was designed to bring professional tracking, mix, and mastering engineers an elegant, precise, and repeatable tool for audio circuit variation. As a high-fidelity hybrid vacuum tube/solid-state enhancement device, the P331 WH offers sophisticated control over your sound, making it an ideal addition to any professional studio setup. Utilizing 6SN7 vacuum tubes from the 1940s, it delivers pristine, lower distortion than many modern tube varieties. Its digitally controlled analog system ensures precision and repeatability across its wide range of tone-shaping options.

Soulful Tube Circuitry

The P331 WH features the revered 6SN7 double triode vacuum tube, known for its low distortion and sonic integrity. This amplifier preserves the essence of classic analog sound while allowing modern engineers to coax a range of tonal characteristics through variable circuit topologies.

Versatile Signal Shaping

The P331 WH’s LOADING circuit is a fully differential Class-A tube amplifier that manipulates tube gain to enhance harmonics and nonlinearities. Switch between “CLEAN” feedback mode for subtle harmonic additions or “BLOOM” feedforward mode for a more pronounced harmonic presence. The auto-padding feature provides seamless level control, ensuring consistent output as you shape your signal.

LIFT Circuit for Frequency Enhancement

The LIFT circuit in the P331 WH provides parallel processing to enhance high, low, or both frequency ranges without compromising the integrity of the original signal. This circuit works in tandem with the LOADING section to add warmth and depth to your audio.

Transformer and Output Options

The P331 WH offers a transformerless default mode for pure signal flow, with the option to engage output transformers for additional texture and harmonic richness. The output gain section offers 11dB of boost or cut with fine-tune control, making the P331 WH adaptable to a wide variety of audio sources.

Key Features:

• 6SN7 vacuum tubes for low distortion and vintage warmth
• LOADING Circuit with “CLEAN” and “BLOOM” modes for harmonic control
• Auto-Padding feature with PRE, POST, and OPEN settings for flexible gain staging
• LIFT Circuit for enhancing high, low, or both frequencies
• Transformer Output Option for added harmonic texture
• Fully repeatable digital control for precise settings recall
• Hard-wire bypass for individual sections and global bypass