Manley Jumbo Shrimp Pre-Amplifier

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Manley Jumbo Shrimp Pre-Amplifier

by Manley Labs

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Product Code:
Manley Labs
Jumbo Shrimp
Manley Jumbo Shrimp Preamplifier

Best of 6 Moons

Have a question about this product? Please email our audio advisor or call 1-877-929-8729 with any questions or concerns regarding your equipment purchase.

Handcrafted in the USA

The JUMBO SHRIMP shares key outward features found in many of its counterparts both past and present. It is a twochannel single-ended line level control preamplifier with five sets of stereo inputs, and two sets of paralleled stereo line outputs. A five-position input selector switch routes the chosen signal directly to the first amplifier tube’s control grid. Amplified signals, boosted about 4 times [11.8 dB] are then fed through a dedicated White-Follower stage (using 5670 triodes) to effortlessly drive the (motorized!) high quality ALPS stereo variable attenuator, known for its stability, long life, ease of servicing and good inter-channel level tracking characteristics. This is followed by a similarly appealing, center-detented ALPS stereo balance potentiometer.

The attenuator network output is then fed to a special White-follower output stage. This output circuit has been a favorite of ours for many years mainly due to the stage’s inherently low output impedance, simplicity, wide bandwidth, ease of drive, modest feedback requirements and graceful overload characteristics. Ordinarily, the typical JUMBO SHRIMP user would not ever begin to approach the limits of this output stage under normal line and loading circumstances.

High quality polypropylene dielectric film-and-foil capacitors have been employed at all signal-coupling points in the circuit along with two extravagant 30 microfarad metalized monsters coupling the output stage signals to the output RCA jacks. These are all MultiCaps made by our buddy Bas Lim at Rel Cap. We know you would rather listen to superior capacitors such as these over some cheap electrolytic capacitors like you might find in other gear.

But the JUMBO SHRIMP’s cardinal feature is its uncomplex non-inverting signal path. This minimal signal path approach is designed to bring unbalanced RCA-type line inputs up to levels suitable for proper drive of downstream power amplifiers in the simplest and most direct way possible. This is accomplished by using only three active stages, as described above, through the judicious use of vacuum tubes, whose purpose-designed application in audio amplifcation is, as always, pressed to full advantage. By so doing, the endeavor here is to provide the most direct, uncolored, quiet and wide-band signal path possible so that the native character of the chosen source material may be heard with out encumbrances from a set of imposed limitations brought on by the preamp. In this spirit, there are no provisions for balanced inputs or outputs. Since the whole guts of the Jumbo Shrimp are inherently single-ended, adding balanced I/O would require additional circuitry, transformers, or IC’s which would inevitably color the sound.

Lastly, we would be remiss if we did not mention the clever REMORA REMOTE CONTROL that comes standard with every Jumbo Shrimp. This little box commands the motorized ALPS volume control via radio frequency signals, so it works through doors, walls, cabinets, you name it!

W=19", L=11", H=3 1/2"
Very short, simple minimalist signal path. All-tube design. 2 x 12AT7 input, 2 x 5670 driver, and 2 x 7044 output.
Signal path furnishes very high dynamic range with prodigious input and output signal headroom.
Signal path also delivers high bandwidth, low noise, modest local negative feedback and low distortion, and is voiced for best musical performance.
Radio-Frequency based remote command of the silicon-free high-quality motorized VOLUME attenuator set, for infinitely resolvable control of listening levels. No need to "point" the remote in any direction. Now the Shrimp's attenuator set can be controlled from another nearby room, through walls, floors and doors, and through opaque equipment closet or cabinet doors too!
Dedicated White Follower stage using the 5670 dual triodes effortlessly drives all passive interstage circuits; volume, balance and output stages receive crisp instruction from the Follower regardless of control settings.
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-triode 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.
ALPS audiophile-grade balance and motorized VOLUME 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.
ALL-TUBE: Vacuum Tube all-triode design
Input Tubes: 2 x 12AT7EH large plate Electro-Harmonix Russian
Interstage Follower Tubes: 2 x 5670 GE USA dual triodes
Output Tubes: 2 x 7044 or 5687 GE JAN NOS
Five Line Level Inputs: unbalanced RCA
MUTE switch and Warm-Up muting delay
ALPS motorised volume control: Accurate tracking usually within 0.5dB. Smooth operation. (no detents)
ALPS 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: 12dB
Input Impedance: 250 kOhm
Input Sensitivity:
Volume Control at MAX: 200mV in yields 0.8V out (12dB GAIN)
Volume Control at 3 o'clock: 200mV in yields 0.380V out (5.6dB GAIN)
Volume Control at 12 o'clock: 200mV in yields 0.115V out (-4.8dB GAIN)
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: LED illumination
RF Remote Control: commands volume control UP/DOWN; uses 9V battery
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:
Shipping Weight: 15 Lbs.

Click here to read the Manley JUMBO SHRIMP review from TONE Audio 4/2010: Tone Audio Review By Todd Sageser

Click here to read the Manley MAHI and SHRIMP reviews from 2/2006: 6moons Review By Paul Candy

Click here to read the Manley SHRIMP review from TAS 1/2008: The Absolute Sound Review By Sue Kraft

Click here to read the Manley Jumbo Shrimp manual: Jumbo Shrimp Manual
1 each, 6 foot IEC 3-conductor power cable
1 each, Owner’s Manual
1 each, REMORA Remote Control

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