Manley Neo-Classic 300B Preamplifier RC

Manley Labs 300B Preamplifier: The Pinnacle of Tube Audio Excellence

The Manley Labs 300B Preamplifier is a groundbreaking creation, combining the legendary 300B tube’s natural warmth with cutting-edge engineering for an unmatched audio experience. As the first and only preamplifier to feature the 300B tube, this product is a testament to Manley Labs’ commitment to innovation and sonic purity. Perfectly suited for both headphones and loudspeakers, the 300B’s smooth, natural sound makes it an exceptional line driver in single-ended configuration, offering the ideal balance of power and finesse.

With its pure Class A triode operation, vacuum tube rectification, and innovative ripple rejection circuit, the 300B Preamplifier delivers ultra-low noise performance—critical for headphone users. Every detail, from the custom-designed output transformers to the gold-plated RCA connectors, is meticulously crafted to provide unparalleled musicality, dynamic range, and durability.

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Key Features

1. 300B Tube Line Driver
   • Leverages the iconic 300B Electro-Harmonix tubes, known for their smooth, natural sound, in single-ended Class A operation.
   • Optimized for headphones and loudspeakers with the ability to drive a wide range of loads.
2. Innovative Low-Noise Design
   • Features vacuum tube rectification and regulation, complemented by a proprietary ripple rejection circuit to eliminate power supply noise.
   • Exceptionally low noise floor of -70 dB ensures clean, distortion-free playback.
3. Premium Input and Output Options
   • 5 unbalanced RCA inputs, 2 unbalanced MAIN and SUB outputs, and 1 RECORD output.
   • 2 front-panel headphone jacks with optimized impedance switching for 30–4000 Ohm headphones.
   • Mutes LINE outputs when headphone mode is selected.
4. Audiophile-Grade Components
   • Includes ALPS volume control, gold-plated RCA connectors, and high-purity silver wiring for optimal signal integrity.
   • MIT/MultiCap audiophile-grade coupling capacitors ensure precise tonal balance.
5. Custom Output Transformers
   • Hand-wound in Manley Labs’ magnetics department, designed for pristine audio reproduction.
6. Flexible Feedback and Gain
   • Factory-set gain at 12 dB with adjustable feedback trim (-1.7 dB to +1 dB) for tailored performance.
7. Rugged and Elegant Build
   • Durable mil-spec PCBs with thick copper plating for long-lasting performance.
   • Beautifully designed chassis, ensuring timeless appeal and reliability.

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Specifications

• Tube Complement:
  • Output Tubes: 2 x 300B Electro-Harmonix
  • Input Tubes: 2 x 6SL7GT
  • Rectifier Tubes: 2 x 5U4GBEH or 5AR4C
  • Regulator Tubes: 2 x OD3 NOS JAN USA
• Inputs: 5 unbalanced RCA pairs
• Outputs:
  • MAIN and SUB: 2 stereo pairs unbalanced RCA
  • RECORD: 1 stereo pair unbalanced RCA (pre-volume control)
• Headphone Output:
  • 2 front-panel 1/4″ jacks with optimized impedance switching (30–4000 Ohms).
  • Output Power: 1W @ 100 Ohms (10V RMS), 1W @ 600 Ohms (25V RMS).
• Frequency Response: 5 Hz – 50 kHz (±1 dB).
• THD: 0.08% @ 1 kHz at 1V RMS out.
• Input Impedance: 100 kOhms.
• Output Impedance: 100 Ohms (LINE stage).
• Maximum Output: 17.2 dBu or 5.636 Vrms.
• Power Consumption: 170W.
• Dimensions: 89 x 483 x 330 mm (HxWxD).
• Weight: 41 lbs.

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Why Choose the Manley 300B Preamplifier?

The Manley 300B Preamplifier is the ultimate choice for audiophiles who demand the legendary tonal warmth of the 300B tube paired with cutting-edge technology. Whether you’re using headphones or loudspeakers, this preamp provides unmatched clarity, dynamic range, and emotional connection to the music. Designed with premium components and rugged construction, it’s a timeless addition to any high-end audio system.