Manley Labs AMPLIFIERS owner manual SPECIFICATIONS 250W

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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