Norman Audio

Price: $11,900

Manley Neo-Classic 500W Mono Amplifier – Display set

With the same topology as their 250’s, the Manley Neo-Classic 500W continue the legacy of musical accuracy and emotional authority these amplifiers promise and deliver with double the output power thanks to the amazing KT90 output tubes. Both the 250 and 500 Monoblocks overflow


with detail and reveal spatial image beyond expectation. Authoritative, muscular, and dependable, these Ultra-American tube amps have no competition at these prices. 

“They have great control, power, and coherence. They possess great extension in both high and low, and do it effortlessly. At no time did I feel they were straining…What you get is classic workmanship, honest reproduction, and a hint of a vintage vibe that more people are coming to appreciate…Tubes Rule!” — Al Chieng, Positive Feedback, October 2019

“The 250 Neo-Classic had that hard-to-define quality that is instantly apparent when heard: a fundamental fidelity to the music…Its sonic personality was honest to the core and completely unfussy, treating music as a thing to be loved and cherished, not as a collection of sounds to be picked apart and analyzed to death.” — John Atkison, Stereophile Magazine, September 2002

 “This is the first time in the almost twelve years I’ve owned my speakers that I’ve felt like they could be holding the rest of my system back. It is possible that more performance is available from the Neo-Classic 250s, which would make their performance even more remarkable.” w— John Kotches, Home Theater Hifi, May 2001

Tried and true: The Manley 500 and 250 Watt Monoblocks are their 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. Manley 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. They 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, Manley 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 their own in-house magnetics department, their 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 Manley 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. They 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 their ears. 


  • ALL-TUBE monoblock design 10 x KT90EH Electro-Harmonix Russian output tubes

  • High current double 12BH7EH driver stage

  • Tungsol 12AT7 large plate input tube


  • 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 in via RCA jacks for full power out; 2V via XLRs

  • 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.

  • Dims: W=19″, D=13″, H=9″

  • Shipping weight: 82 lbs. each