Allnic L-4000 Line Stage Tube Preamp - A Tube Rollers Dream

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I've been waiting for a chance to play with an Allnic product and we finally got our first one.

This piece was worth the wait. From the unique designs and layout to the exemplary parts selection and engineering, it's an impressive pre. The volume design/build alone is worth the price of admission.

This sample looks and works like new and will include a tube rollers dream featuring a plethora of vintage makes and models for you to play with.

You can also just leave the upgraded tubes in place and enjoy it to the max.

This is a complete set including remote, manual, and original packing.

Original MSRP was $14,200!

More from Allnic:

Transformer coupled output REFERENCE LEVEL Linestage with XLR and RCA input and output. Remote control for selecting which input you want, volume, and muting. Dials on front indicate condition of tubes.

Superb signal to noise ratio, runs cool and fantastic resolution and tonality.Just simply a superb design.

Allnic is short for 'all nickel' because the transformers are with 78% nickel core perma alloy. This makes ALLNIC head and shoulders above over designs because this is the best material to use, and thus an extremely wide bandwith with wonderful highs as well as rock solid low frequency.

It has a 41 SILVER stepped motorized remote controlled volume attenuator for precise volume and ease of operation

Special features include patented gel cap dampening tube sockets which isolate micro phonics by eliminating external vibrations giving you the purist sound possible.

Specifications:

Frequency response:
16Hz to 75kHz

Total harmonic distortion:
0.06%

Gain:
20dB (line)

Signal to noise ratio:
90dB (line)

Output:
15V (Pre out Max)

Tube complement:
2 x E810F
2 x 7233
2 x 6485

Dimensions:
16.93" x 13.79" x 6.81"
(430 x 350 x 173mm)

Weight:
35.27 lbs.
(16kg)

Link to Manual:

https://www.hifiengine.com/manual_library/allnic-audio/l-4000.shtml

Recommended Cables:

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - BALANCED XLR Connectors - Better

Kimber Kable - BALANCED XLR Connectors - Best

Kimber Kable - Power Cords - Better

Kimber Kable - Power Cords - Best

The SkyFi Testing Process for Preamps:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.

We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.