The Manley Jumbo Shrimp is an excellent preamp and one we have used in our own systems. And it even has a remote control! Recommended!
- 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
- 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
- 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
- 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.
The Jumbo 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
Shrimp FAQ #1: The Shrimp is unbalanced. Why can't I have balanced inputs and outputs?
the Shrimp is entirely a single-ended design. The circuitry uses
single-ended topology. In order to be able to provide balanced inputs or
outputs we would have to convert the signal to balanced using something
like some IC's or transformers. Both these options would add more
"stuff" to the signal and be certainly audible detracting from the pure
sound the Shrimp provides. If you are dealing with balanced source
outputs or driving a balanced amplifier with the Shrimp, check to see if
you also have unbalanced connections on that gear, change your cables
and go with that. You might be pleasantly surprised that they too added
extra audible "stuff" in order to provide balanced XLRs and the RCAs
that don't have that extra "stuff" in the signal path actually sound
better. (Depends on a given unit's specific design.) Or use some RCA to
XLR adaptors. Most balanced gear has no problem being driven single
ended but check with the manufacturer if they are going to want the
negative pin 3 of the XLR grounded or floating. Transformer-coupled XLR
jacks always can be driven single-ended by running HOT into Pin 2 and
grounding pin 3 to pin 1. Some IC coupled XLR inputs will want pin 3
floating, others will require it to be grounded when running
single-ended into it. Check with the manufacturer of your gear to see
how to hook it up single-ended.
Good question! The TAPE OUT is passive and comes off the input select
switch. So whatever source is selected will show up passed through at
the TAPE OUT, regardless of whether or not the Shrimp is on or off.
FAQ #4: What's the difference between a 5687 and 7044?
The 7044 is used in the White Follower output stage, and honestly
there's really no difference between the NOS GE 7044 and NOS 5687 in
this specific circuit. The gain is less than 1, (0.9 actually) and
rolling tubes here has minimal effect on the sound, if any.
QUESTION: I've been enjoying my Manley Shrimp for about a year now.
It's Great! How can I use headphones with the Shrimp? I want to retain
the beauty of the tubes. Can I attach headphones directly to the second
pair of mains out? Do I need a headphone amp between the headphones and
the second pair of mains out? For the second mains out, +21dBm into
600 Ohm load would be providing about 126mW. Will this suffice without a
Reply: All I can say it TRY IT (you will not hurt anything) and see if
it has enough juice to use without a separate headphone preamp.
I TRIED IT! It's Great! I bought a pair of headphones from
Sweetwater (BeyerDynamic DT 880 Pro) and a cable from Cables For Less (
pair RCA males to 3.5mm stereo headphone female). Setting the volume
between 11-12 o' clock is all the juice that is needed. Thanks!
Notes from Mitch: I'm glad Tim's having a good time with that set-up,
but it's a close call in the headroom department. If it starts to sound
strained or clip out a
little on crescendos then that is an indication that the Shrimp's output
stage is delivering less and less undistorted output power as the load
gets heavier; normal for a situation like this.
Those BeyerDynamic DT 880 drivers are rated at 250 Ohms impedance. He'd
get near full power with a 2500 or 5000 Ohm to 250 Ohm step down
autoformer, which he'd need if the phones were any less sensitive, or
the white follower stage were less forgiving. Good thing he's trying it
with some newer
higher-Z phones rather then some old 8 Ohm Koss monsters from the bad
We only advise the user tries driving headphones directly from the
Shrimp's outputs if the headphones' impedance is greater than 200 Ohms
or the headphones' sensitivity is higher than 95 dB / mW, unless a
step-down autoformer is part of the picture.
There is no risk to the Shrimp's circuitry and you won't blow up or
destroy anything. But if the load is not friendly enough, it just won't
sound very good.
Get the owner's manual for the Manley Snapper®
Features and Specifications
MANLEY SHRIMP® PREAMPLIFER
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
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: 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
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.