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Manley Mahi Monoblocks

Manley Mahi Monoblocks

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Product Code: MAN0000074

Price is for a pair!

The Manley Mahi monoblock EL84 tube amplifiers may look a little on the small side but don't let them fool you - they have big sound. Bass is surprisingly deep and lively. The music draws you in and holds you - it reminds you of what you really want. And that is to be engrossed int eh music you love. The Mahis deliver that kind of sound!

These cute little guys produce around 40 watts RMS in Ultra-Linear mode or around 20 watts in TRIODE from a quartet of EL84 / 6BQ5 tubes driven by a 6414 dual triode driver and a 12AT7EH input dual triode. The EL84 has been one of our very favorite tubes for many years, extremely long lasting and reliable, and can be considered the smaller brother of the much beloved EL34: really quick-sounding both in the bass and especially in the top end. And of course this has a lot to do with our Manley Output transformer, the same one we build for the Manley Stingrays.

We have been building EL84 amplifiers for well over a decade. The Manley-branded Tiny Triodes were much acclaimed in the early 1990's. In 1993 after the Manley company split off from VTL, the Manley Tiny Triodes underwent a chassis rework to become the Manley 35 watt Monoblocks soon followed by the 50 Watt Monoblocks. The more powerful Ultra-Linear mode operation became the standard with hard-wired Triode operation or Triode/UL switching available upon special request.

After the introduction of the Stingray Integrated amplifier in 1998, we then went back and incorporated the Stingray's new circuitry design refinements into the 50 Watt Monoblocks. Finally, big bass out of a small amplifier! So, topology-wise, the post-1998 50 watters were the monoblock version of the stereo Stingray, with the additional variable feedback feature. After the introduction of the fabulous Manley Snappers in 2002, it was obvious that we had to update our classic EL84 50 watt monoblocks both cosmetically and feature-wise. Make-over time!

Everyone was always asking us for Triode/Ultra-Linear switching. We listened to your requests and feature the Triode-UL switch as standardequipment on the MAHI's. As are the beautiful german WBT binding posts. Also we increased the B+ rail capacity in a major way. The 50 Watt monos only had around 45 Joules or energy storage in the B+ rail. Now the MAHI's have nearly 115 Joules of energy storage for the B+ rail. You can hear this improvement in the especially in the bass region: tighter, faster, deeper. More is more in this case.

The chassis design is like a mini-Snapper. They are so cute! And of course they come standard as a pair so you get.... "Mahi-Mahi."

We believe the MANLEY MAHI's give a lot of value for an affordable price and we think you will be surprised at just how big these little guys sound. You have no idea how fabulous these amplifiers are.

For more information about variable feedback, read Notes on Negative Feedback.

Get the owner's manual for the Manley Mahi.

Features and Specifications

Manley Mahi:

  • Input Tube: 1 x 12AT7EH large plate Eletcro-Harmonix Russian
  • Driver Tube: 1 x 6414 JAN NOS GE or Raytheon branded
  • Output Tubes: 8 x EL84 Ships with Russian NOS EL84M (aka 6Pi14Pi-EB) We are out of Ei 6BQ5.
  • Output Tube Quiescent Standing Current: 25mA
  • Set Bias for 250mVDC measured across each 10 Ohm cathode resistor
  • Input Impedance: 110 kOhm
  • Negative Feedback: MIN= 3dB; STD=6dB; MAX=10dB of global NFB
  • Gain:
    • FB MIN: 30.7 dB 32.1 dB
    • FB STD: 28.5 dB 29.1 dB
    • FB MAX: 26.1 dB 27.1 dB
  • Input Sensitivity for Maximum Output Power: defined as input voltage required in order to produce maximum power output reaching 1.5% THD @ 1KHz
    • FB MIN: 175mV 155mV
    • FB STD: 312mV 340mV
    • FB MAX: 480mV 566mV
    • Input Sensitivity for 1W into 8 Ohms: 61mV 53mV
  • Maximum Output Power: defined as power output reaching 1.5% THD @ 1KHz
    into 5 Ohms:TRIODEUL
    FB MIN:18W20W
    FB STD:27W42W
    FB MAX:28W46W
    into 8 Ohms:TRIODEUL
    FB MIN:14W24W
    FB STD:24W40W
    FB MAX:25W41W
  • Signal to Noise Ratio Ref. 1W: Typically 82 dB A-WGT 20-20K
  • Noise Floor: Typically 150µV = -74dBu A-WGT
  • Noise Floor: Typically 650µV = -62dBu unweighted
  • Will Scratch Your Floor: Use pennies under pointed feet to avoid marring cabinetry. Try quarters if you are in upper tax brackets. The bargain performer would be nickels. Paper currency does not function as well. Euro coins work 1.54 times better. Concrete pavers or wooden chopping blocks serve fine for amplifier platforms.
  • Dynamic Range: 83dB
  • THD+Noise @ 5W: less than 0.15%
  • Frequency Response at full power UL mode w/MAX NFB: 20 Hz to 20 kHz FLAT
  • Frequency Response at 5W into 5 Ohms: 10 Hz to 30 kHz FLAT, -3.75dB @ 100KHz
  • Recommended Speaker Load: Optimized for 5 Ohms
  • Output Impedance:
    • TRIODE / UL
    • FB MIN: 2.43 Ohms 3.10 Ohms
    • FB STD: 1.47 Ohms 1.67 Ohms
    • FB MAX: 0.90 Ohms 0.95 Ohms
    • TRIODE / UL
    • FB MIN: 3.29 2.58
    • FB STD: 5.45 4.78
    • FB MAX: 8.90 8.43
  • Damping Factor:
    • TRIODE / UL
    • FB MIN: 3.29 2.58
    • FB STD: 5.45 4.78
    • FB MAX: 8.90 8.43
  • Power Consumption (idle): 102 Watts (0.85A @ 120VAC)
  • Maximum Power Consumption (at Full Power): 168 Watts (1.4A @ 120VAC)
  • 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 3 Amp SLO-BLO Ceramic Time-Delay fuse
  • Mains Fuse 220-240VAC operation: MDA 1.5 Amp SLO-BLO Ceramic Time-Delay fuse
  • B+ Fuse: MDA 400 mA SLO-BLO Ceramic Time-Delay fuse
  • Badge Illumination: Units produced before 3/2003 use 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4" - Serial numbers after MAHI036 use LED illumination which probably won't burn out
  • Dimensions: 11" deep x 10" wide x 5" tall
  • Shipping weight each: 18 pounds

Specifications subject to change because they just might.

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