Pre/Power Amplifiers

It wasn't a budget buy, but this late '70s integrated from the masters of the MOSFET spearheaded fresh thinking on amplifier design. But how does it sound today?

The advantages of using separate pre and power amplifiers over an integrated is a discussion that can still occupy audiophiles for hours. What was almost a necessity in the valve era became less technically significant once transistors were established, a quality solid-state preamp circuit being undemanding in terms of space and power.

The appearance might be retro but the performance is right up to date Deliciously retro in appearance, Icon’s huge flagship power amps began life in 2009 as the MB845s: so-called because they utilise a pair of the mighty 845 direct heated triodes. Still in production, the MB845s cost just half the price of these latest MkII versions, designer David Shaw significantly reworking an original design rated at 65W and ‘repositioning’ the model as a more prestigious high-end product. The MkII also employs an improved high current driver circuit employing two 6SN7 dual-triodes. High power output from the two 845 valves requires a truly massive power supply design too, so the MkII’s mains transformer has grown in size compared with that of the original MB845.

Purist 'analogue only' headphone amps have a new champion in the form of iFi Audio's flagship iCAN Phantom, designed for in-ears to electrostatics and all 'phones inbetween

When you state your headphone amplifier is the 'Rolls-Royce of flagships' you must be very confident that it's a clear cut above rival high-end devices. But that's exactly what iFi Audio is doing with the iCAN Phantom, shown for the first time at High End Munich in May '23. This £3749 analogue headphone amplifier is positioned above all its previous efforts, including the erstwhile flagship Pro iCAN Signature headphone amplifier, which remains on sale at £2299.

These purist valve amps from France are still something special, reckons Ken Kessler, but first it's time to put your expectations to one side...

Here beginneth a lesson in audio prejudices – mine and yours. Jadis has created a truly 'high-end' pre/power combination of so narrow a focus that we as audiophiles have to search deep into our hearts before even considering reading about them, let alone owning them. In other words, go no further if you refuse to accept that a manufacturer can (and maybe even should) impose restrictive behavioural practices upon the end user. Forget universality, market savvy commercial appeal, user-friendliness or post-remote control era ergonomics – the JPS8 is aimed at out-of-the-closet masochists.

Though outwardly unchanged, a serious internal makeover has brought Karan's cool-looking pre/power duo up-to-date. But how do these revised models sound? here must be many audiophiles who are torn between valve and solid-state amplification. If you are attracted to the sound of valves, but hesitate to take the plunge for practical reasons, you’ll be interested in solid-state products which try to offer the best of both worlds. And that’s part of the promise held out by the Karan amplifier line, which is built in the Republic of Serbia and has been gathering a following in several other countries since around 2000.

Developed to celebrate Krell's 40th anniversary, the KSA-i400 combines all the brand's proprietary circuit ideas in one very powerful amplifier. We partner it with the Illusion II

Over time, most hi-fi brands develop an image: ask any audiophile and you'll be told this one is warm, that one is all about rhythm and timing, and another is 'bright and detailed, but I could never live with it'. Of such generalisations, myths are born, and I'd say it's a pretty safe bet that most enthusiasts 'know' what Krell is all about – big, heavy, and massively powerful American amps, with the ability to drive just about any speaker to any level you want, or could imagine.