Manley Labs SHRIMP Pre & MAHI Monos

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£7,900.00 £3,650.00

Call Choice Hifi on 020 8392 1959 or to enquire about this product!



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.


In 2002, we brought out our new entry-level tube preamplifier, The Manley Shrimp®. But it is so unfair to label it as “entry-level”. This preamp sounds sooooo much better than that!


  • Very short, simple minimalist signal path. All-tube design. 2 x 12AT7 + 2 x 7044

  • Generous energy storage via large power supply capacitors for more impact in the bass.

  • No global feedback makes the Shrimp very fast sounding.

  • Non-inverting two-tube gain stage is direct-coupled for most pure signal path.

  • Cool White-follower output stage provides low 50 Ohm output impedance. This is much better than a boring plain ol’ cathode follower. The Shrimp can drive anything, not to worry.

  • Filament supply floated 80V above chassis ground for quieter operation and longer tube life.

  • NOBLE audiophile-grade level and balance pots. We use the nice parts in here!

  • MIT/MultiCap polypropylene audiophile-grade signal coupling capacitors, including two 30 uF monsters on the output stages.

  • Warm-up delay / MUTE button. Features and quality components usually not found on entry-level pieces.

The Shrimp is very quick and alive sounding. Good rhythm and extension. Very transparent sounding. We hope you enjoy our fresh and clean Shrimp cocktail!(Lemon and tartar sauce not required for normal operation.)


Brand: Manley Laboratories

Model Name/Number: SHRIMP & MAHI

Price (RRP): £7900

Choice Hifi Price: £3650

Product Information:



  • Input Tube (each mono block): 1 x 12AT7EH large plate Eletcro-Harmonix Russian
  • Driver Tube (each mono block): 1 x 6414 JAN NOS GE or Raytheon branded
  • Output Tubes (each mono block): 4 x EL84 Ships with Russian NOS EL84M (aka 6Pi14Pi-EB)
  • 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 TRIODE; 32.1 dB UL
    • FB STD: 28.5 dB TRIODE; 29.1 dB UL
    • FB MAX: 26.1 dB TRIODE; 27.1 dB UL
  • 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 TRIODE; 155mV UL
    • FB STD: 312mV TRIODE; 340mV UL
    • FB MAX: 480mV TRIODE; 566mV UL
    • Input Sensitivity for 1W into 8 Ohms: 61mV 53mV
  • Maximum Output Power, defined as power output reaching 1.5% THD @ 1KHz:
    • into 5 Ohms:
      • FB MIN: 18W TRIODE; 20W UL
      • FB STD: 27W TRIODE; 42W UL
      • FB MAX: 28W TRIODE; 46W UL
    • into 8 Ohms:
      • FB MIN: 14W TRIODE; 24W UL
      • FB STD: 24W TRIODE; 40W UL
      • FB MAX: 25W TRIODE; 41W UL
  • 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:
    • FB MIN: 2.43 Ohms TRIODE; 3.10 Ohms UL
    • FB STD: 1.47 Ohms TRIODE; 1.67 Ohms UL
    • FB MAX: 0.90 Ohms TRIODE; 0.95 Ohms UL
  • Damping Factor:
    • FB MIN: 3.29 TRIODE; 2.58 UL
    • FB STD: 5.45 TRIODE; 4.78 UL
    • FB MAX: 8.90 TRIODE; 8.43 UL
  • 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: 50 ~ 60 Hz
  • Fuse type and ratings @ 117 VAC operation:
    MAINS fuse: 3 Amp 3AG slow-blow use glass body Littlefuse Series 239
  • Fuse type and ratings @ 230 VAC operation:
    MAINS fuse: 1.6 Amp 3AG slow-blow use glass body Littlefuse Series 239
  • 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



  • ALL-TUBE: Vacuum Tube all-triode design

  • Input Tubes: 2 x 12AT7EH large plate Electro-Harmonix Russian

  • Output Tubes: 2 x 7044 or 5687 GE JAN NOS

  • Five Line Level Inputs: unbalanced RCA

  • MUTE switch and Warm-Up muting delay

  • NOBLE volume control: Accurate tracking usually within 0.5dB. Smooth operation. (no detents)

  • NOBLE balance control: Center detented

  • Record Output: (AKA “TAPE OUT”) Unbalanced RCA jacks, unbuffered, passive (always ON)

  • Main Outputs: Two sets of unbalanced RCA main outs for bi-amping or driving a powered subwoofer

  • Gain: 11.8dB

  • Input Impedance: 250 kOhm

  • Input Sensitivity: 200mV in yields 1V out

  • Maximum Input Level: 5V in produces 1.5% THD at output

  • Frequency Response: 10 Hz – 80 KHz; 20 Hz – 20KHz, -0.3dB

  • Noise Floor: Typically -83 dB 20-20K with volume control fully open

  • Noise Floor: Typically -95 dB A WGT 20-20K with volume control fully open

  • Noise Floor (shorted input): Typically -94 dB 20-20K with volume control fully closed

  • Noise Floor (shorted input): Typically -106 dB A WGT 20-20K with volume control fully closed

  • S/N Ratio: typically 95 dB A WGT 20-20K

  • THD: 0.02% at 1V rms output

  • Output Impedance: 50 Ohms

  • Maximum Output: +23dBu @ 1.5% THD into 100K load (10.9V rms)

  • Maximum Output: +20dBm @ 1.5% THD into 600 Ohm load

  • Badge Lamp: Serial numbers below MSP054 used 12V 3AG “Fuse Lamp” 1 1/4 x 1/4″ Order it here. Serial numbers MSP055 and up use LED illumination

  • Power Consumption: 55 Watts (485mA @ 120VAC)

  • Operating Mains Voltage: Units are purpose built for original destination country’s mains voltage: 100V, 120V, or 220-240VAC as indicated on the serial number badge. Power transformer must be replaced in order to change mains operating voltage. 120VAC units may NOT be rewired to put the primaries of the power transformer in series for 220-240V operation or a large radiated field of hum will develop. If changing locations/voltages, the power transformer must be replaced with the dedicated one for the voltage at which it will operate.

  • Mains Voltage Frequency:

  • Dimensions: W=19″, L=11″, H=3 1/2″

  • Shipping Weight: 15 Lbs.


Age: 10 Years

Condition: 9/10

Voltage: 220/240/50Hz

Finish/Colour: See pics

Packaging? No

Accessories? N/A

Item Location: In Stock

Status: Second Hand

Dimensions 5708473 cm