Integrated Amplifiers

The sweet spot in a three-strong series of late '80s amps, this high current integrated promised to handle low impedance speakers without breaking a sweat. We listen...

Most hi-fi enthusiasts know how many watts their amplifier can produce, but does that figure tell the whole story? In the early '80s, Harman Kardon's HCC (High Current Capability) range of integrated amplifiers gave listeners another number to think about, which was how much current an amplifier was able to source.

The new entry-level model in the Norwegian company's amp range is a sensible mix of facilities and performance – or at least it would be, if the sound wasn't sensational!

Oslo-based Hegel has been enjoying something of a purple patch of late: not content with raising eyebrows with the sheer performance of its flagship H590 integrated amplifier [HFN Oct '18], it went on to get dangerously near that level with the much more affordable H390 model [HFN Aug '19], offering almost all of big brother's sound quality for not much more than half the price. Our HFN review concluded that it was 'sensationally good value, with a clean, powerful sound and bags of musicality, not to mention exceptional flexibility including onboard network streaming'. Unsurprisingly, it won the 2019-20 EISA Award for 'Best High-End Amplifier'.

Promising more power, better sound and greater flexibility, will this latest incarnation of a longstanding 'audiophile favourite' tube integrated meet the challenge?

The first Stereo 40 tube integrated amp arrived in the year 2000, and according to Icon Audio's founder and chief designer David Shaw, 'is the heart of what we do'. It's the metaphorical ham sandwich of the valve amplifier world – the staple diet of audiophiles wanting a simple, affordable, user-friendly integrated that offers classic tube sound and some interesting features too. This new £2200 Stereo 40 MkIV sits bang-smack in the middle of the range and, as claimed, is uncommonly versatile.

The artisan of high-end tube audio, Jadis, has imbued more than a little Gallic flair into this 'entry level' integrated. Serve with sensitive speakers for a taste of magic...

Until the mid-1990s, valve amplifiers were typically persona non grata. The '80s had been all about solid-state – from tweaky low-powered integrateds to mega powerful monster power amps – and tubes didn't so much as get a look in. By the turn of the millennium however, the pendulum had swung back and tube amps were reinvented as exclusive objects of luxury and desire, famed for their sweet and satisfying sound. How times change!

Debate that’s been raging since the dawn of hi-fi, Integrated vs Separates boils down to this: the former’s benefits over the latter include the removal of a pre-to-power cable connection, the need for one less AC outlet, less shelf space and – above all – the knowledge that the two sections are optimised for each other. Separates, however, counter with truly dedicated power supplies for each section, as well as isolation of the pre and power amp stages for less potential for undesirable interaction. Traditionally, the higher you go up the price scale, the more likely you are to opt for separates. Over the decades, milestone integrateds would appear that upset the formula: Sugden’s A48, specific models from Rogers, McIntosh, AR, et al.

Yes, those valves – made in-house – really are a foot tall! And they radiate substantial heat once the SXI has been powered up for a few minutes, but KR Audio’s amplifiers are beautifully engineered. The company is based in Prague, founded by electronics engineer the late Dr Ricardo Kron in 1992. It’s a boutique firm of only a dozen or so people – skilled artisans who blow the glass and hand-craft the tubes. Such is the transparency of KR Audio’s Kronzilla amplifiers that at least of couple of German recording studios use them in mastering suites.

Very big in the Far East since 2005, Line Magnetic offers a comprehensive range of tube-based disc players, DACs, phono stages and amps. Here's the entry-level integrated

We may now live in an age of digital and streaming, but the number and sheer variety of valve amplifiers on offer seems to be on the increase. Perhaps more remarkable are those designs that unashamedly hark back to a previous era, attempting to keep it alive by the use of modern technological twists. One of the main proponents of this philosophy is Chinese company Line Magnetic, the £1699 LM-34IA integrated reviewed here being just one of a wide range of its amps inspired by famous designs of the past.