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Manley 250 Watt Monoblock

New Neo-Classic Design for 2000! Same great ballsy sound, new chassis design to fit in those HUGE new transformers! The NEO-Classic 250 are available now.

A magazine reviewer once wrote the following about the Manley 250's: "In triode mode a pair of Manleys produces a remarkably three dimensional soundfield that is both convincing and seductive. When switched into tetrode mode, the Manleys have the brawn to deliver a full symphony orchestra directly into your living room." "When I listened through the same cut through the triode mode tube amps, I cried. Yup, tears ran down my cheeks while I bounced up and down, waving my arms, physically buffeted by the raw emotion of the music. Emotion- that essential component at the very core of great music. The Manleys pass through that emotional information, but the (solid-state amps) don't."

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 tetrode 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 play tunes (albeit not-so-great-sounding-tunes) when the Ever-Warm mode is engaged.

We added a front-panel mute switch and created a new angled-back chassis to 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 2000 the 250's were completely overhauled once again. 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.

Rear View

Get the owner's manual for the Manley 250 Watt Monoblock

Features and Specifications

Manley 250 Watt Monoblock:

ALL-TUBE monoblock design: uses 10 x EL34JJ output tubes
Driver Stage: High current double 12BH7EH (x2) Electro-Harmonix Russian
Input Tube: 12AT7EH large plate Electro-Harmonix Russian
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; 20 kOhms @ 20KHz; 38 kOhm @ 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:
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

Specifications subject to change because they just might.

Manufacturer's Suggested Retail Price

Manley 250 Watt Monoblock Original Retail Price: $12,500 per pair (USD $)

Manley 250 Watt Monoblock FAQ

FAQ #250. What tubes should I get for my Manley 250's?

If you are retubing, we would suggest the stock original tubes. For the output tubes, we use the EL34EH (Russian Electro-Harmonix), and have found these to be quite good. We sell them at $14/ea in quantities of 20 (two matched sets of ten). At times we are also using the JJ Slovakian EL34's supplied to us by our good buddy Aspen Pittman at GT. I have also heard good things about the Svetlana EL34's but have not evaluated them extensively because factory supply from the Svetlana St. Petersburg factory is unreliable. It's tough to evaluate the lifespan of a tube until it dies so we stick with what we know works and sounds good. The 6414 driver tube is a bit of an oddball, with GE and Raytheon being the ones you will probably find (that's what we have here- $15/ea). The 12AT7 input tube is very common, and we use the Ei version here ($15) which most audiophiles are fond of. I am personally a little afraid of untested "new old stock" tubes at high prices. There may be a reason they have been kicking around for 30 years. And also as we run each and every tube we put in all of our gear through a battery of noise, operation, gain, and matching tests and purposefully select every tube specifically for best performance in that specific product and circuit, we think we are putting the very best tubes in Manley gear that we can possibly put in there.

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!

FAQ #252. How do I re-pack the box? The foam pieces confuse me.