Manley Labs AMPLIFIERS owner manual Specifications 250W

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SPECIFICATIONS (250W)

ALL-TUBE monoblock design: uses 10 x EL34JJ output tubes

Driver Stage: High current double 12BH7EH (x2)

Input Tube: 12AT7WA Ei large plate

BALANCED & UNBALANCED inputs: RCA and XLR jacks (switchable)

MUTE switch: on front panel

TRIODE / TETRODE switching: on front panel

SOFT-START turn on mode: minimizes in-rush current by first powering up amplifier to half voltages

EVER-WARM mode: for standby keeps tubes warmed up at half voltages

MANLEY Precision Output Transformer: designed and wound at Manley Labs

Front panel bias measurement and adjust: Concealed under the black oval insert

Output Tube Standing Current: 27.5mA

Set Bias for: 275mVDC measured across each bias tip jack to ground

Large filter / reservoir capacitors: 3800uF x 2

Angled rear of chassis: provides for easy connections

WBT binding posts: CE compliant for European models

Input Sensitivity: 1V for full power

Input Sensitivity Triode: 174mV for 1 watt into 8 ohms

Input Sensitivity Tetrode: 146mV for 1 watt into 8 ohms

Gain Triode: 30dB

Gain Tetrode: 32dB

Input Impedance RCA: 116 Kohm @ 1KHz

Input Impedance XLR: 270 Kohm @ 1KHz; 20Kohms @ 20KHz; 38Kohm @ 20Hz

Actual Output Impedance Triode: 0.538 ohm

Actual Output Impedance Tetrode: 0.465 ohm

Optimum Speaker Load: 5 ohms

Damping Factor Triode: 14.8

Damping Factor Tetrode: 17.2

S/N Ratio Ref 1W into 8 ohms: -80 dB; -90dB A-WGT

Dynamic Range: 93dB

FLAT frequency response: 10 Hz - 30 KHz continuous

Full Power Tetrode: 250W @ 1.5% THD into 5 ohms

Full Power Triode: 100W @ 1.5% THD into 5 ohms

Power Consumption: 30 Watts in "EVER-WARM" mode

Maximum Power Consumption: 815 Watts at full power

Operating Mains Voltage: Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.

Operating Mains Voltage: changeable with power transformer re-wiring and fuse value change.

Mains Voltage Frequency: 50~ 60Hz

Mains Fuse 100-120VAC operation: MDA 10 Amp SLO-BLO Ceramic Time-Delay fuse

Mains Fuse 220-240VAC operation: MDA 8 Amp SLO-BLO Ceramic Time-Delay fuse

B+ Fuse: MDA 1 1/2A SLO-BLO Ceramic Time-Delay fuse

Badge Illumination: Units produced before 4/2003 use 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4" Serial numbers after N250188 use LED illumination which probably won't burn out

Power Cord: Detachable IEC standard. Appropriate power cord supplied for destination country

Dimensions: W=19" x D=13" x H=9"

Shipping Weight: 73 Lbs. each

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Contents Tubes Rule Contents Introduction Mains Connections If you live in a strange placeConnecting Your Amplifier Overhead View Tube Location & TypeFront View Manley Rear ViewSwitching on -- Soft Start Operational NotesBias Procedure Also refer to Troubleshooting Specifications 250W Specifications 500W Page Warranty Registration Packaging Amplifier Pre-packing Instructions

AMPLIFIERS specifications

Manley Labs, a renowned name in high-fidelity audio equipment, has established a reputation for its premium amplifiers, celebrated for their exceptional sound quality and innovative design. With a commitment to craftsmanship and the integration of cutting-edge technology, Manley amplifiers cater to audiophiles and professionals alike, delivering a listening experience that is both immersive and authentic.

One of the hallmark features of Manley amplifiers is their use of high-quality vacuum tubes in many of their models. The warmth and richness that tubes impart to the audio signal are particularly appealing to music lovers who seek a classic analog sound. Models like the Manley Stingray and the Manley 300B offer a distinctive tonal character, allowing musicians and listeners to experience the nuances of recordings as intended by the artists.

In addition to tube technology, Manley amplifiers frequently incorporate advanced solid-state circuitry, striking a balance between traditional warmth and modern reliability. The Manley Reference Amplifier exemplifies this hybrid approach, featuring a robust power supply and precision engineering that ensures a clean, dynamic sound. This versatility allows the amplifiers to perform beautifully in various listening environments, from home setups to professional studio applications.

Manley Labs is also notable for its attention to build quality. The amplifiers are crafted in the USA, utilizing high-grade components and rigorous quality control processes. This commitment to craftsmanship means that every unit is built to last, ensuring long-term reliability and performance. The aesthetic appeal of Manley amplifiers, with their distinctive vintage-inspired designs and premium finishes, further enhances their desirability.

Another key characteristic of Manley amplifiers is their versatility in handling various types of audio signals. Models like the Manley Neo-Classic 300B can accommodate both low-impedance and high-efficiency speakers, making them suitable for a wide range of setups. Additionally, features such as customized input and output transformers help to optimize the performance for different audio sources.

In conclusion, Manley Labs amplifiers embody a blend of vintage charm and contemporary engineering. Their proprietary tube designs, robust solid-state options, and unwavering quality make them a standout choice for anyone seeking an exceptional audio experience. Whether in a casual listening room or a high-end studio, Manley amplifiers promise to deliver richness, clarity, and a connection to the music that transcends the ordinary.