The Manley 500 and 250 Watt Monoblocks are our most powerful push-pull production-models. Both the circuit design and the selected componentry have been refined over years and years of development. Reliability that you can depend upon combined with musical accuracy and emotional authority is what these amplifiers promise- and deliver.
They are able to switch operation modes allowing the listener to choose between the sonically seductive qualities of triode and the more powerful Ultra-Linear configuration. We use big, beefy reservoir capacitors in the high voltage supplies giving plenty of instant energy for dynamic performance of transient peaks and bass impact and weight which often exceeds that of rival solid-state amplifiers.
ALL-TUBE monoblock design 10 x KT90EH Electro-Harmonix Russian output tubes
High current double 12BH7EH driver stage
12AT7EH large plate Electro-Harmonix Russian input tube
BALANCED & UNBALANCED inputs
TRIODE / Ultra-Linear switching
SOFT-START/ EVER-WARM standby mode
MANLEY Precision output transformer
Factory set for 5 Ohms nominal
Front panel bias measurement and adjust (hiding under the black insert)
Large filter / reservoir capacitors 3800uF x 2
Angled rear of chassis provides for easy connections
WBT binding posts
Input sensitivity: 1V
Gain: 32dB tetrode; 30dB in triode
Input Impedance RCA: 116 kOhm 1KHz
Input Impedance XLR: 270 kOhm 1KHz - 20 kOhms 20KHz - 38 kOhm 20Hz
Noise Floor: Tetrode: -67dB; Triode -65dB typical
S/N Ratio: -80 dB
Dynamic Range: 96dB
FLAT frequency response: 10 Hz - 30 KHz continuous
Power Consumption: 30 Watts in "EVER-WARM"
Full power (tetrode): 500W
Full power (triode): 275W
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:
Dims: W=19", D=13", H=9"
Shipping weight: 82 lbs. each