LINE MAGNETIC L.M. 518IA,  a top brand single ended tube amplifier which uses the great 845 tubes

Now also available in a black version.

Please read the product review of Andrew Baker from New Zealand listed below with additional information

Can be functioned as a pure stereo tube power amplifier

Delicate yet powerful sounding single ended class A tube amplifier

All point to point wiring (hand soldering)

2 x 12AX7 for pre-amplifier session

2 x  EL34 or 6V6 or 6L6 (6P3P) for impulse stage (different batches may come with different impulse tubes)

Can use KT88, 6V6, 6L6, EL34, 6550, 6CA7 as impulse tubes for different sonic presentations

5AR4 rectifying tube and 2 x 845 vacuum tubes for power output

Soft start (about 30 seconds)design for optimum protection

High precision VU meter and bias adjustment knobs on top panel

Bias adjustment and hum balance control

Special handmade low magnetic leakage Ei power transformer

Special handmade wide frequency response Ei audio transformers

Dual audio choke design and Germany M cap coupling capacitors

Silver plated high purity copper internal signal wiring

High quality Japan ALPS motorized volume control

Elegant remote control unit

4ohm / 8ohm / 16ohm selectable output load impedanc

Detachable power cord system (IEC)

3.150,00 2.990,00 You Save: 5%

Technische specificatie:

Power output: 2 x 22W Class A

Frequency Response: 10 Hz - 50 kHz, -1.5db

Input sensitivity: 220mV (as integrated amplifier),

                               800mV (as stereo power amplifier)

Input impedance: 100Kohms

Output load impedance: 4ohms, 8ohms, 16ohms selectable

THD+N: ≤ 1 %/ 1Khz

S/N ratio: ≥ 87 db

Power Consumption: 320W

Dimension W x H x D : 430 x 250 x 365 mm

Andy Baker finds himself in an orgiastic frenzy of fantasies about tube-rolling as he luxuriates in the superb sonics of an amp from Guangdong Province.

BY NOW, AND in this day and age, you should have no doubt that China is producing high quality and reliable products for the hi-fi market, whether that be for your favourite English, US or Japanese brand, or from dedicated individual Chinese companies. If you remain unconvinced then you had better check out China’s Line Magnetic immediately.

Line Magnetic’s line-up of valve-based amplifiers, digital players and speakers features the Silver series which runs from the affordable through to the high end (see my review of the marvellous entry-level LM-211IA amplifier), the Gold range and then the more esoteric stuff which includes Western Electric clones and suchlike delightful oddities most of us can only dream lustfully of owning.

The LM-518IA sits in the Gold range, so named for its striking carrot/gold front panel and, in this instance, the elegant white painted chassis. One of the many things which impresses me about Line Magnetic – and that fantastic name is definitely one of them – is that in terms of build quality, you almost can’t make any distinction between models. Whether it’s an entry level Silver or an expensive Silver or Gold, they are built like the proverbial tanks and look like they are worth a million bucks. Well, several thousand anyway.

Build & Features

The 518IA is a Single-Ended Triode (or SET) integrated amplifier and it’s based around 845 output tubes – lovely big powerful bottles that they are – giving a modest but entirely decent 22 watts per channel. Two 63P3 driver valves are used along with a single 5AR4 rectifier and the little family of valves is completed by two 12AX7s doing preamp duties.

Yes, you guessed it, this is a tube-roller’s dream amplifier with potential sonic flavour variations aplenty. In fact, New Zealand’s sole Line Magnetic agent, Turned On Audio, supplied the demo unit with two vintage Phillips 12AX7s. The rest were the stock valves but they all sounded wonderful, so unless you already own some treasured, exotic valves, which I’m sure will boost the amp up a notch in sonic performance, don’t feel the need to rush out and buy any expensive boutique jobbies straight away.

Sitting behind the valves in their white coated metal housings are the transformers – one low magnetic leakage toroidal and two wide frequency response audio transformers. All three are carefully handmade. High quality “audio-grade” capacitors and components are used internally with traditional point-to-point hand-soldered wiring. I have nothing against circuit boards of course, but point-to-point just seems to show another degree of love; or perhaps I’m a sentimental fool. The Japanese ALPS motorised volume control is operated with a lovely little solid aluminium remote and the volume knob itself, along with the matching source selector, are beautiful pieces of machined metal. The front facia also features the on/off switch and a window for viewing the VU display. There are three line-in inputs (no phonostage or built-in DAC, as are often incorporated these days), a pre-in so the 518IA can be used as a power amplifier, binding posts for 4, 8 and 16 ohm speakers and a removable power cable. There are also bias and hum adjustment facilities so you can manually check up on bias and also tune unwanted speaker hum to a minimum, and there’s a soft start 30 second delay when you power on to protect those precious internal components from the sudden rush of current. A removable valve cover is included and the amp looks great whether this is left on or removed.

A full-sized amp, the 518IA will require plenty of room to breathe as the transformers are high and the 845s even taller. I sat the review sample upon a solid granite slab on the floor as it wouldn’t fit in my cabinet. Driving 845 valves requires a bit of grunt, so those transformers are big… and heavy. This amp is a back breaker at about 35kg so if you’re slight of build or feeble of muscle, I suggest you recruit some help for lifting and siting – you may just need it.

This is an absolutely stunning looking amplifier; nice and simple in execution and the build quality is truly exceptional. There was a slight hum from the transformers which didn’t intrude on the music and to be honest, I haven’t heard many amplifiers that don’t hum to at least some degree. My own amp hums and my friend’s Leben CS-600 valve integrated hums.


Once the LM518IA was in place, set up, plugged in, powered on and given time to warm up – a good 30 minutes or so is ideal – my next dilemma emerged: what on earth to play first? The possibilities were endless, but I wanted to make a good first impression. I must confess that my first inclination was towards jazz, but as that seemed a little too obvious to begin with (big glowing valves, low watts, reasonably efficient speakers and glorious mono jazz LPs – who could blame me?) I thought a little harder. As it turned out, every genre I played sounded absolutely gorgeous and I needn’t have worried. My Reference 3A speakers are approximately 90dB into 8 ohms and, as expected, there was not a single issue with the 518IA driving them. The pairing made music sound rich, full, powerful and room-filling. Love at first listen? When I finally decided on some music, you bet it was.

With Wilco’s ‘How To Fight Loneliness’ from their excellent Summer Teeth record, my room was filled with smooth and vibrant music full of detail and luscious textures. The organ had an ethereal feeling and there seemed to be an extra twinkle to the piano keys. Bass was nice and chunky, sounding more live and real somehow, which was also the case with the drums and cymbals to which there was an added dimension of detail; like they had been focused to highly clarified accuracy. Jeff Tweedy’s acoustic guitar strumming was delightful and his voice sounded clear and natural with an “ultra-present” quality as though I could have set my dog on him (she would have sniffed him then wandered off to search for cats).

The Line Magnetic fired clean, controlled music out of the speakers with great speed and rhythm and an ease and musical naturalness that made me blissfully ease back into the couch and yet, perhaps paradoxically, were I of a certain, perhaps more lively, inclination I may have been up making silly wiggly movements around the living room and embarrassing the children.

have a few older reggae and dub records in my collection (Junior Murvin, The Upsetters, King Tubby) and while they may not exactly sound “audiophile”, through the Line Magnetic their grooves were infectious, bass rich and fulsome with highly engaging rhythm sections. My copy of Scientist’s thrilling 1981 record Scientific Dub was next on the turntable – which seemed appropriate really, given the delightful rendering of analogue recording gear and variety of fiercely glowing tubes on the cover. The layered, blazing sound of the first track ‘Drum Song Dub’ featured great tonal balance where the treble was clear and crisp – as evident with the pin-sharp percussion on display – and the bass line fat, jaunty and addictively rhythmic. Around about the upper bass I detected a tinge of not-unwelcome warmth which added a more organic feel to the low end rather than the usual hi-fi-like slam; it was rich but without sounding flabby. Warmth is a characteristic usually attributed to valve equipment – an over-and sometimes wrongly-used description (or assumption) – but ‘natural’ is definitely the best word I can use to describe the 518IA. It definitely doesn’t fit the usual stereotype.

Pitch Black’s Rhythm, Sound and Movement – Rude Mechanics Remixes was another triumph, with heart-stopping dynamics, engaging bass, swathes of florid sounds and rhythms emanating from the speakers in all directions. At one point it seemed to reach right around behind me, and I could hear the trail of sound as it left the speakers. The bass was solid, powerful and well controlled, surprising me with the depths it reached (I discovered another picture on the wall that needs to be better secured).

Deciding to see if the LM could handle something heavier, I fired up my tube-buffered MHDT Labs DAC and selected from my computer’s hard drive a recent discovery. This was English metal band Valfader and their EP Whispers Of Chaos. Valfader combines the best of Mogwai-like soft-loud post rock with Slint’s epic aeroplane-taking-off-in-your-skull note stretching and their own brand of hard and heavy riffing. The instrumental title track starts all post rock noodling, but several exciting tempo changes later is a fully exhilarating metal assault of ‘80s proportions, with spacey hints of psychedelia. The delivery via the Line Magnetic was speedy and action-packed – the drumming was weighty and powerful and the guitar and bass riffing breath taking. Not only did the sound extend into the room with lifelike scale but the room seemed to extend into the imaginary plain created by the loudspeakers. I liked the way the LM518IA conveyed a sense of realism and presence to performers – whatever I happened to be listening to – gently easing space between each instrument and each individual note and coaxing more definition from all the little details that emerged.

Keeping with the heavy theme, the 518IA brought new life to Black Sabbath’s Paranoid (Rhino Records 180g vinyl reissue) with powerful punchy drumming, thick slabs of sludgy bass and vivid blossoms of electric guitar riffs and solos. Hearing the way notes and chords were coherently struck from the strings brought new depth to how I listened to these songs; I was excited by the riffing and the sharp solos but I found I could also listen to chord structures, harmonic sequences, and everything fitted together compellingly. A lot of this music is pretty simple stuff, but it is still clever. The rhythm section had a lush creaminess yet retained that raw, blistering power which rightfully keeps them their place in the hard rock/heavy metal history books. Ozzy’s distinctive vocals reached exhilarating highs with delirious and sweaty ease, sounding as fresh as if the album was recorded only yesterday. Give the man his dues, he can sure wail.

The Oscar Peterson Trio’s sublime little album We Get Requests, and specifically the track ‘Goodbye JD’ was lush and spacious, delivered with lightning quick pace and fast, stunningly detailed transients and notes had well defined leading edges with great body and decay. Peterson’s piano was some sort of intoxicating liquid – pouring like golden champagne from the speakers, both his hands clearly heard playing the keys with satisfying timbral accuracy and an effervescent agility. The rhythm section sounded totally groovy, proving to be the perfect vehicle to drive along Peterson’s swift playing, providing good strong bass action and lively, colourful drumming – both of which succeeded in creating a vibrant and energetic execution of the song.

Listening to hi-fi gear, for me, is listening to the way instruments and notes, melodies, harmonies and rhythms interact and react with one another and the environment in which the music was recorded; the layers, shadings, textures and colours created by a bunch of people and their instruments. This includes the warm tones of a good bass line, the percussive tickling of piano keys, the swagger of a rhythm section or the grit and soul in a singer’s voice. The LM518IA allowed me to listen like this without even having to think about it.

This amp is transparent, has a huge soundstage with brilliant imaging and exquisite detail (most often, instead of thinking ‘I haven’t heard that before’ it was more like ‘I haven’t heard it like that before’) but all that was such a given as to not seem to be as important as the pure naturalness of the sound which was allowing me to hear instruments sound tonally as they should. The Line Magnetic has a way of transporting the listener into the realm of the musician and his or her instrument – it is pure escapism.


The LM518IA is not only beautiful to behold (though I did hear of one visitor to the house asking what the hell it was), it is beautiful and magical to listen to. This amp sounds natural, sweet and inviting, remaining completely unfazed by whatever music it is subjected to – metal, jazz, bass-heavy electronica all sounded totally amazing. Sure, the price tag is hefty but it is well worth every goddamn cent and for most (sane) people it will be an amp for life.

It drove my modestly sensitive speakers with ease and will be right at home with a wide range of speakers. Vinyl is my number one source but digital music sounded amazing in its own right. Whether I was playing high-res FLAC files or streaming lower quality internet radio, the Line Magnetic brought music to life and took my senses and emotions on a colourful and thrilling journey, miles from the usual day-to-day trials of life.

As mentioned, I think tube rolling is to be encouraged but is not entirely essential, at least not at first – for who couldn’t resist tweaking and experimenting with those little “living” glass beauties? So sit back and enjoy the music. Remember I mentioned my friend’s Leben CS-600? Seriously, the Line Magnetic is in the same league, and if you’re in the market, with that kind of budget, it’d be well worth a China vs Japan shootout – though it could be too close to call.

If you still remain unconvinced that such a good piece of audio equipment can come out of Guangdong Province, then you are doing yourself – and your music collection – an absolute disservice. ANDREW BAKER

When I began writing for Stereophile, I heard people whispering:

"Herb is one of those triode-horn guys."

Wrong. Most of my life, I've favored solid-state integrated amplifiers driving small, British-made speakers.

"I'm sure he hates digital."

Wrong again. I sold all my LPs some 12 years ago, and since then I've been filling my days with CDs and high-resolution downloads. (However, I am starting to collect vinyl again, because my vintage DNA still remembers how to worship at the Altar of Black Discs.)

"Reichert? He's a mono guy. He's not into imaging."

Way beyond wrong! In my view, hearing the tangible verity of a recording venue, and the precise locations in it of microphones and performers, are essential to any full comprehension of recorded music.

Of course, I am not free of audiophile prejudices. I am not attracted to giant robots (very large loudspeakers) or alien monoliths (big, heavy power amplifiers). Both tend to make me anxious. I also believe that, if an audio component is going to cost as much as a good car, it should image well enough to reveal to me its own blue-robed design wizard floating above it. Actually: I want to see that wizard, and his wand and pointy hat, even when the component costs only as much as an affordable integrated amplifier.

The highest-quality audio products are not designed using only a single audio technology, old or new, any more than they are created only by a particular ethnic group or only within a particular geopolitical sphere. Today's best hi-fi inventions are made everywhere on the globe, by brave, inspired, talented people whose creations aren't me-too products, but instead are unique components designed to fulfill the earnest dreams of devoted audio connoisseurs. The Line Magnetic LM-518IA integrated amplifier is such a product.

In 2005, two brothers established the Line Magnetic Audio Co. Ltd., to manufacture—in their own factory in Zhuhai, in China's Guangdong Province—distinct ranges of CD players, DACs, amplifiers, and loudspeakers. They were motivated by the excellent sound and build qualities and elegant appearance of vintage Western Electric movie theater electronics and loudspeakers.

The elder brother, Zheng Cai, is in charge of Line Magnetic's Classic models, which include high-quality reproductions of such vintage Western Electric gear as the renowned 91A and 86A 300B amplifiers, as well as other WE-inspired inventions of Cai's own design. His younger brother, Zheng Xi, is in charge of a team that creates Line Magnetic's Silver and Gold lines of more affordable audiophile products, including the LM-518IA ($4450), a single-ended-triode, line-level integrated amplifier, based on the 845 triode tube. The LM-518IA has been at the heart of my reference system for more than a year.

If you're not familiar with the Line Magnetic product range, I encourage you to take a moment and peruse the website of Tone Imports, Line Magnetic's US distributor. There you'll see that the LM-518IA is the middle model of a range of three 845-tube SET amps. The biggest, the LM-219IA—almost an alien monolith—costs $7495. It uses a single 300B triode tube per channel as a driver stage for its single 845 output tube per channel. The LM-518IA's diminutive sibling, the LM-218IA ($3495), is a smaller, lighter version of the '518 in hammertone silver, with no rectifier tube. Like the '518, the '218 has two 12AX7 tubes and a pair of triode-operated beam power tubes—6P3Ps are standard in the '518—to swing the high voltages needed to drive the grids of the fierce 845 output tubes. All three amps feature retro styling, and massive mains and output transformers.

For those of you unfamiliar with directly heated tubes, the 845 is a three-element tube that, unlike the ubiquitous, indirectly heated 12AX7 or EL34 tubes, does not employ a separate heater for the cathode to generate currents of electrons. Instead, directly heated triodes conduct large amounts of current in order to boil off high-energy electrons directly from their coiled-wire filaments. A directly heated tube has one of two filament types: dull emitters, which are nickel coated in oxide; or bright emitters of thoriated tungsten, as in the 845. Almost every guitar amp and audiophile tube amp made today uses indirectly heated coated-nickel dull emitters (footnote 1). To my ears, a properly designed amplifier using directly heated thoriated-tungsten tubes always sounds more vivid, elegant, direct, and brilliant than its indirectly heated dull-emitter counterpart—especially when excessive amounts of feedback aren't masking the tube's essential character.

The most important thing to understand about the design of the LM-518IA is that it is not a KT120, EL34, EL84, KT88, or 6550 amp. Unlike those popular audio-tube types, the 845 was designed—by RCA, in the early 1930s—to be a sturdy source of power in commercial and military radio transmitters like the ones in your local AM station or B-17 bomber. Each 845 anode requires over 1000V DC and is capable of dissipating about 100W. Compared to some lazy, bourgeois EL34 amp, the LM-518IA is a fire-breathing fairytale beast: the sonic and aesthetic antidote to all those newfangled, cool-running, class-D solid-state amps. Run in pure class-A, the 845 tubes' filaments operate at 3140°F, and their glass surfaces emit literally skin-searing heat. Beware! Never touch the big tubes while they're lit, or for quite a while after they've been turned off—and never poke around inside an LM-518IA just after you've turned it off. The former will send you to the emergency room. The latter could send you to your grave—or, worse still, maybe even void your warranty!

The first time I lifted the 77-lb LM-518IA out of its box, I realized that it's a helluva lot of stereo amp for $4450. And when I removed its bottom plate, I couldn't stop staring at the expensive, German-made Neglex coupling capacitors, or counting the multitude of Japanese-made Rubycon electrolytic capacitors. Eventually, I noticed the LM's two substantial filter chokes, and the artfulness of its point-to-point wiring.

On the rear panel, for each of the two channels are four high-quality, gold-plated, five-way speaker terminals: one each for 0 (ground), 4, 8, and 16 ohms. The only preamp inputs are three pairs of gold-plated RCA jacks. A fourth pair of RCAs, labeled Pre In, lets the LM-518IA be used as a basic power amp.

On the LM-518IA's enameled top plate are screws for adjusting the bias and canceling any hum in each 845 tube. In the course of my yearlong possession of this amp, I have never had to use these: There has been no hum, no sputtering, no hissy crackling noise—just lots of warm air rising. Speaking of which, it's essential that you leave at least a foot of open space around and above the LM-518IA. And if you value the safety of curious pets or wayward children, use the tube cage (supplied).

On the front panel are a sturdy On/Off button, a meter to assist in biasing the 845 tubes, and two silver dials. The first of those is the volume control, its face containing a tiny orange LED that subtly flashes as the LM-518IA warms up, after which it glows steadily, serving to indicate the dial's position. The second dial selects among the three line-level inputs. The stainless-steel remote control sports only Volume and Mute buttons. The LM-518IA has no DAC, no phono stage, no Bluetooth receiver, no WiFi capabilities—and, to my extreme disappointment, no balance control or mono button.

It was never my intention to formally appraise the Line Magnetic LM-518IA. I borrowed it only to use it as a temporary reviewing tool: I needed a high-quality, reasonably priced integrated amplifier that was more contemporary and more available than my vintage Creek Audio 4330, and that could serve as a benchmark against which to assess other affordable (and mostly solid-state) integrateds. In this capacity, the LM-518IA has performed far beyond the original call to duty. I review it now only because I believe readers need to know: What is this brightly glowing, 22Wpc amplifier to which I keep alluding?

Read more at https://www.stereophile.com/content/line-magnetic-audio-lm-518ia-integrated-amplifier#dEgiVUXvtW6PODRV.99



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