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Manley 500 Watt Monoblock
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Tried and true: 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. We run high voltages on the plates of the output tubes but operate them at lower current which will result in their longer life. Although each output tube has its own bias-adjust, We carefully fit each amplifier with computer-batched tubes for optimum performance. The bias adjustment pots and measuring points are conveniently located behind the oval front panel insert.

To avoid a heavy power drain when the cold amplifier is first switched on, we conceived a "Soft-Start" mode which also functions as an "Ever-Warm" position allowing the amplifiers to be always warmed up for pleasurable listening. Each amplifier only consumes 30 watts of power in Ever-Warm mode. A blinking green LED reminds the user that the amplifier is in warm-up mode because as all the power supplies are at half-voltage, the amplifier will still operate at half power when the Ever-Warm mode is engaged, so the user should use the MUTE switch when in this mode.

The front-panel mute switch and angled-back chassis make it easier to hook up the interconnects, speaker cables, and IEC power cord.

In our own in-house magnetics department, our R&D team completely redesigned all of our output transformers in 1998 with the goal to reclaim that luscious rich mid-range of our vintage designs. In 2013 we reworked the output transformer to operate the output stage in Ultra-Linear mode which is a great sounding balance between the detail of triode and the brawn of Tetrode. We also specifically set out to achieve a deeper bottom register at higher power with lower distortion. Hours and hours of listening tests, measurements, and fine-tuning brought an exciting and stunning result to our ears. We hope you will agree.

A satisfied customer wrote to us about his 500's:

Bass performance is astonishing in either tetrode or triode mode. It is deeper and fuller with more bloom and extension, while at the same time being faster and tighter than my solid state units. The lower midrange to deep bass is seamless and lends a satisfying richness to the musical content as a whole. From Paul Chambers' acoustic bass to Peter Gabriel's megabass, wow !

As great as the bass is, the midrange is killer. It has a smoothness and richness which is just breathtaking. Gobs of detail, with crisp attack. and long decay notes defining spatial imaging beyond expectation. The high end is even more extended and lacks the grain and edge of solid state amps. It is sweeter and more detailed. Listening sessions last a long time. Friends won't go home! Thanks again for a great product at a great price. Best regards, Geoffrey Wyshak"
Get the owner's manual for the Manley 500 Watt Monoblock



Features and Specifications
Manley 500 Watt Monoblock

  • 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
  • MUTE switch
  • 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

Specifications subject to change because they just might.


Manley 500 Watt Monoblock FAQ

FAQ 251: Help! A tube blew!

Read this: Checking your bias, B+ fuse, tube and Cathode and Screen Resistors

Also shows Cathode & Screen Resistor locations and PCB layout and tells you what to do if a tube blows. And even how to fix it without soldering!

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