EXPIRED For Sale Manley Laboratories Neo-Classic 300B Pre Amplifier

Further Information

Current model retailing for 14k. Classic David Manley design which has been in production and revised since the 90's. Here we have the latest revision in fantastic condition complete with original packaging and original valves.

Preamp is pictured with NOS Ken Rad VT229s which can be included for an extra $200. It's got a decent headphone section but I've never tried it. Headphones are for dorks.

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.

Key Features

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.

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.

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.

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.

Custom Output Transformers

Hand-wound in Manley Labs’ magnetics department, designed for pristine audio reproduction.

Flexible Feedback and Gain

Factory-set gain at 12 dB with adjustable feedback trim (-1.7 dB to +1 dB) for tailored performance.

Rugged and Elegant Build

Durable mil-spec PCBs with thick copper plating for long-lasting performance.

Beautifully designed chassis, ensuring timeless appeal and reliability.

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.