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Mistral Linestage & Powerstage

[Mistral Linestage, Powerstage, and Spirolink IV]
[Italian version]

Product: Mistral Linestage and Powerstage
Manufacturer: LFD Audio, 110 Oxford Crescent, Clacton-on-Sea, Essex, C015 3PZ, tel.+44.(0)
Approximate price: e800/US$950 each
Test sample: loaned from local distributor

When was the last time you heard of LFD, Essex University's audiophile spin-off? Indeed, the company's proprietors and designers Richard Bews and Malcolm Hawksford aren't exactly in the same league as an Ivor Tiefenbrun or an Amar Bose when it comes to marketing their product. They are far too much engineers for that...

While LFD already wasn't exactly stratospherically-priced high-end, they still felt the need for a cheaper entry-level line of products, which was born a few years ago now, and christened Mistral. Mistrals mimick the original circuitry of 'real' LFDs, but give in to a few compromises in component choice and overall finish. A strategy that could be effective, when you know that the simulated granite front panels of LFDs can't be cheap.

Tested here are the Mistral Linestage and Powerstage, a 50W (line-level) pre/power combination that truly is a downsized LFD LS0/PA0 pairing. Outwardly these units looks very nice, if you ask me and my wife, being of a satin black with a brushed aluminium front panel. With the black metal knobs the overall look is understated, a bit like Classe electronics, or perhaps like some older Rowland stuff. However, I understand that in most other countries the knobs are gold-coloured, making the picture a bit less modest. Compared to these economy versions, the LS0/PA0 add a thicker front panel, in simulated granite or in rather flashy Corian, better internal wiring, and perhaps a few more expensive passive components here and there.


Linestage innards The preamplifier features five line inputs, one tape loop, and a double set of line outputs, facilitating passive bi-amping. Inside there is a sizeable toroidal transformer (estimated from the sight I'd say 100VA or so, making it half as powerful as the one in the power amp, but still not quite as monstrous as the 500VA transformer of my Michell preamp!), feeding three independently rectified power supplies: one for each channel, and one for switching an output protection relay. The audio circuitry is based upon ten BC550/560 bipolar transistors per channel, presumably DC-servoed with a TL-071 IC. There are controls for source selection and for volume, that's all. In use the volume potentiometer gave excellent channel balance tracking, which, to me, is something very important. [Click on the picture to enlarge]

Powerstage innards The power amplifier also is fully discrete, with a class AB MOSFET output stage and a bandwidth extending to 160kHz. There are output posts for two sets of cabling, taking bare wire or banana plugs. A nice touch are the two spare fuses that come with the amp: I always find it particularly irritating when an amp blows its fuses a few minutes after shop close time on Saturday evening and, invariably, amps always use a type of fuse I don't have in stock myself. [Click on the picture to enlarge]

Not that the LFD blew anything...

The proof of the pudding...

I slipped both Mistrals into my system, in-between the Rega Planet CD player and the old Quad ESL speakers (incidentally, recent exposure to quite a few super high-end systems have shown me that the Quads still are almost unsurpassable in sheer musicality). From CD to preamp ran an LFD Spirolink IV interconnect, between pre and power it had to be my usual stranded LC-OFC microphone cable job.

Playing with the ESLs is always a bit of a risk, as their mean and capacitive impedance can be too tough a load for many a reputed amplifier. Not so with the Powerstage. It drove the Quads admirably well, and indeed I would say they were an excellent match for each other!

For instance, my stallwart Mary Black CD sounded rhythmic and involving, with a rounded tonal balance that was neither slowed-down nor outright dulled. Quite the contrary: treble was brilliantly clear and exceptionally clean, without going as far as turning glassy. The Mistrals never sounded grainy, never did something wrong to sibilants. The bass was fat and tuneful, not booming along, but just being there and making itself heard. But neither was it very detailed: in fact, it was as if the bass' outer details were there, carrying the tune and the rhythm and the architecture of the music, while some inner detail was missing. Moving up in the spectrum, voices and instruments each had their very own identity, well-articulated in a stable soundstage of perhaps only medium openness, but still with fine width and depth, and with good response to dynamic contrasts.

Overall tonal balance was slightly warm, with a creamy and beguiling midband, and something like a patina of tubelike-sound coherently covering everything from the lows to the highs (but certainly without the grunge and lack of transparency of lesser tube designs!). I would describe the Mistrals as eminently colourful, perhaps slightly exaggeratingly so, but with many loudspeakers, or when the alternative is a grey sound, this is to be a good thing.

The Cowboy Junkies minimalist The Trinity Sessions showed the airco very clearly far behind Margo Timmins' voice, which in itself was smooth and friendly, lacking any hardness, even during louder parts. One of her musical brothers kicking in with the vocals was rendered with the voices perfectly separated, and if you want a testimony of what these amps can do with faint details, even during complex passages, you should play this disc, concentrating on the drum sounds far away to the right, or listening to the fine harmonics of the cymbals here and there!

Perhaps things were a little bit too rounded and softened, but the Mistrals have an overall musicality that pervades the proceedings and makes you want to listen to ever more music. Which is what this is all about, after all.

Switching back to my regular pre/power combination of Michell Argo and Quad 306 opened up the soundstage, with a lighter and brighter sound, attacks being more explicit, and with more detail in voices and in the breathy sounds around them. Yet, I feel that in overall quality both amplifier combinations are at the same high level, with the Mistrals giving their enjoyable performance even at very low listening levels, where the Michell/Quad paring can take on a more nervous character. When all is said and done, and trying to be honest, I think I would even prefer the Mistrals over my own amplifiers.


This Mistral package reminds me a lot of the LFD Integrated Zero LE I tested some years ago. Build quality is good, the power amp is stable and unfussy, and the sound, though not without character, is wonderfully warm and musical. Together this makes for components which can not be too highly recommended, and future owners will get an awful lot of pleasure from them. And if you know that the Mistral Integrated amplifier, at half the cost, may bring much of the same...

© Copyright 1999 Werner Ogiers for TNT Audio Magazine (https://www.tnt-audio.com)

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