Pre/Power Amplifiers

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Network Audio Players/ServersPre/Power Amplifiers
Primare PRE35/A35.2 Networked Pre/Power Amp
Review: David Price, Lab: Paul Miller  |  Feb 13, 2020
hfncommendedWith wireless streaming, class-leading connectivity and 200W of Class D power, this sophisticated Scandinavian pre/power combination covers all the digital bases

Primare – the company that describes itself as 'the sound and vision of Scandinavia' – is also becoming rather more visible in the UK and rest of Europe thanks, in part, to the boost provided by a couple of EISA awards. Based in Sweden and founded by Danish designer and audiophile Bo Christensen, Primare has found its métier over the past few years. Its Prisma platform brought integrated wireless streaming functionality to the hi-fi world before most – and delivered it with typical Scandinavian panache. Ergonomic excellence is central to the brand's values, and this is surely a concept whose time has come.

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Pre/Power Amplifiers
PS Audio BHK M600 Power Amplifier
Review: Mark Craven, Lab: Paul Miller  |  Jan 12, 2023
hfnoutstandingPS Audio grows its hybrid tube/MOSFET amplifier range with a new flagship that's the crowning achievement of the late and hugely respected designer Bascom H King

Until this year, the flagship power amplifier in PS Audio's stable was the BHK Signature 300 [HFN Jul '16]. Still on sale, it bears the initials of Bascom H King, the veteran designer (Infinity, Constellation Audio and more) who was given license by the Colorado-based company to engineer a high-output monoblock amp around his favoured tube/solid-state hybrid topology. Six years on from launch, the '300 model has been relegated to second-tier status, replaced by the PerfectWave BHK M600.

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Outboard DACsPre/Power Amplifiers
PS Audio Stellar Gain Cell DAC & Stellar M700 DAC/Preamp/Monoblocks
Review: Andrew Everard, Lab: Paul Miller  |  May 27, 2020
hfncommendedThis entry-level combination from US brand PS Audio combines proprietary technology with some tried-and-tested solutions in a preamp/DAC and brace of mono power amps

Colorado-based PS Audio is known for a number of things: its products are handmade in its own US facilities and, as of last year, it only sells direct to its US customers. Here in the UK, PS Audio's equipment is sold more conventionally, through distributor Signature Audio Systems, which premiered the company's Stellar Phono Amplifier at the Hi-Fi Show Live at Ascot in October last year. That product, along with the Power Plant 3 AC regenerator [HFN Jan '20], is part of the new entry-level range from the company.

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Pre/Power Amplifiers
PS Audio Stellar M1200 Mono Power Amplifier
Review: Mark Craven, Lab: Paul Miller  |  Mar 01, 2021
hfnoutstandingThis flagship monoblock is not only more powerful but features significant design enhancements over other Class D amplifiers in the Stellar range, including a tube input...

The best of both worlds' is an oft-used rallying cry in the hi-fi industry, rolled out to extol the virtues of everything from compact loudspeakers with big bass output to digital network players with phono stage inputs. It's also the self-proclaimed raison d'être of PS Audio's Stellar M1200 monoblock amp. Sold in pairs for £6000, this recent addition to the Stellar range combines a high-power Class D output stage with Class A vacuum tube input, in pursuit of both efficient speaker-driving muscle and spine-tingling musicality.

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Pre/Power Amplifiers
PS Audio Stellar Power Plant 3 Mains Regenerator
Review and Lab: Keith Howard  |  Mar 03, 2020
hfnoutstandingDon't look down your nose at PS Audio's cheapest mains regenerator. Used with low-power source components, pre and headphone amps, it can still be transformative

Back in the late 1970s Bob Stuart of Meridian observed that an amplifier has more inputs than those labelled as such, others being 'output' and 'mains'. It was an idea to which lip-service was widely paid but, on the mains side, nobody really picked up the idea and ran with it until PS Audio introduced its first mains regenerator in 1998. Yes, we'd had mains filters and conditioners of various types before but this was the first device that said that if you want the cleanest mains supply you're going to have to synthesise it from scratch.

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Pre/Power AmplifiersVintage
Quad 22/Quad II (Vintage)
Hi-Fi News Staff  |  Jan 30, 2015
The Quad 22 control unit and II power amplifier have both enjoyed a presence on the hi-fi scene almost from its very beginnings. The 22 appeared in 1959 but the matching Quad II power amplifier had been around since 1953. Like most amplifiers then, the22/II was split into separate units, for mounting inside a larger cabinet. The compact 22 came with a basic metal shell so that none of its working parts was exposed should it be left free-standing.
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Pre/Power AmplifiersVintage
Quad 33/303 (Vintage)
Ed Selley  |  Nov 17, 2011
The first solid-state Quad remains a classic of the genre Exemplifying all that was admirable in British hi-fi, the 33 preamp (£43) and 303 power amp (£55) were Quad’s first commercial solid-state offerings, the company having waited for the new-fangled transistor to settle down before embracing it in 1967. It was in many ways ‘a solid-state Quad 22’. Any previous customer would have immediately recognised the control locations, the flushmounted rotaries, the balance control under the volume control, the press buttons that also offered Quad’s unique, fully cancellable filter and tone controls and RIAA selectors. In size, the 303 and the Quad II power amps were nearly interchangeable.
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From the VaultPre/Power Amplifiers
Quad Valves Reinvented!
Ken Kessler  |  Jun 20, 2023  |  First Published: Nov 01, 2000
hfnvintageKen Kessler brings you an exclusive subjective review of a legend reborn: the Quad ll-forty mono power amplifiers and QC-twentyfour preamp

Goodness me! Two Quad scoops in one season! OK, so it's not like waking up with Kim Basinger, but I am fully aware of the privilege. When I kicked off the Quad 989 loudspeaker review [HFN Jul '00]

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Pre/Power AmplifiersVintage
Radford STA 15 Series 3 (Vintage)
Ed Selley  |  Nov 24, 2010
Radford Electronics was set up in Bristol by Arthur Radford back in 1959. In some ways Radford was a late starter in the world of high fi delity, especially compared to Peter Walker of Quad or Harold Leak, and the electronics refl ect this. Indeed, Radford’s designs are often described as being the most ‘modern’ of vintage amplifiers. It was the Series Two amplifiers, soon changed to Series Three, that put Radford’s designs on the map, the Series 3 range comprising two monoblocks – the MA 15 and MA 25 – plus two stereo versions, the STA 15 and STA 25.
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Pre/Power Amplifiers
Robert Koda Takumi K 70 (£35,000)
John Bamford and Paul Miller  |  Apr 10, 2011
The first product from a new Japanese high-end marque, this imposing hybrid power amplifier system employs a ‘DC reactor’ power supply housed in a separate chassis Rarely does an amplifier designer launch a new hi-fi company with such a bold high-end statement. ‘This is our vision of amplification’s ultimate form’, says designer Robert Koch of the imposing ‘tri-chassis’ Takumi K-70 power amplifier, designed and built in Japan, and the very first product to sport the Robert Koda brand name on its fascia. The Japanese ‘Takumi’ character can be translated as ‘maestro’, while the word ‘takumi’ actually means artisan – the naming of the Takumi K-70 being particularly apt as the amplifier is wholly hand-crafted, and manufacturing is limited to just 20 units per year. It’s a single-ended hybrid design employing some 32 power transistors and two 5842 triodes in each monoblock and one 6X5 rectifier tube per side in the power supply.
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Outboard DACsPre/Power Amplifiers
Rolling Boulders
Martin Colloms  |  Dec 16, 2022  |  First Published: May 01, 1997
hfnvintageThe no-compromise 2010 preamp and 2020 DAC are part of the US manufacturer's ongoing 2000 series project. Martin Colloms listens

Boulder's founder and chief engineer Jeff Nelson gained his first audio engineering experience with studio mixing desks and the design of a professional cartridge tape unit. This led to a constructive interchange with the late Deane Jensen, the audio transformer wizard and the originator of a classic 'operational amplifier'. This was not an integrated circuit but one implemented at good power and wide bandwidth via the use of discrete devices.

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Pre/Power Amplifiers
Rotel Michi M8 Mono Power Ampiifier
Review: Andrew Everard, Lab: Paul Miller  |  Nov 27, 2020
hfnoutstandingIt looks like the S5 stereo power amp, both inside and out, but the Michi M8 monoblock is altogether more powerful and, as a result, offers a sound with a charm all its own

You'll have to examine the £5399 Michi M8 monoblock power amp very closely to see how it differs from the company's S5 stereo model, reviewed previously alongside the £3299 P5 preamplifier [HFN May '20]. The two are the same price and size, look identical and have much the same 'ask a friend to help' mass. In fact, the M8 weighs marginally less than the S5, at 59.1kg – the difference presumably accounted for by the need for two-channel inputs on the stereo amp whereas the mono version has only single-channel connections, on both balanced XLR and unbalanced RCA sockets.

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Pre/Power Amplifiers
Rotel Michi P5/S5 Pre/Power Amplifier
Review: Andrew Everard, Lab: Paul Miller  |  Jun 03, 2020
hfnoutstandingA sleek new look heralds the return of Rotel's premier sub-brand, and its new control amplifier – or preamp – and stereo power amp have the wherewithal to succeed

Michi is back: last marketed in the 1990s, Rotel's elite sub-brand has rejoined the hi-fi fray after a three-year development project, and the establishment of a dedicated facility within the company's factory to hand-build the new products. And I have to admit to a pang of nostalgia for I reviewed the company's RHCD-10 player, slimline RHA-10 preamp and substantial RHB-10 power amp back in the dim and distant, and it was a case of lust at first listen, not to mention sight of the high-quality metalwork with its red-lacquered wooden side-cheeks.

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Pre/Power Amplifiers
Rotel Rb 1552 (£700)
Ed Selley  |  Nov 01, 2011
A very potent performer considering the accessible price In its most recent 15-Series line-up Rotel entered the brave new world of efficient Class D amplification with some of its models. It promotes them more for home cinema and custom installation duties rather than ‘pure audio’ systems, however. For high fidelity music reproduction Rotel still prefers to focus on tried-and-tested Class A/B solid-state designs, in which it has a fine pedigree. Cosmetically, the RB-1552 is identical to the more powerful ’1582, only the chassis’ reduced depth and lighter weight suggesting a smaller power rating here.
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From the VaultPre/Power Amplifiers
Samuel Johnson Audio
Ivor Humphreys  |  Mar 17, 2023  |  First Published: Apr 01, 2000
hfnvintageThe arrival of a new British hi-fi brand is a major event. Ivor Humphreys hears Samuel Johnson's 50W-rated pca100/ppa100 pre/power amplifiers

Abrand new company, Samuel Johnson was founded by a group of enthusiasts, most of whom had met through their work with a Scottish-based manufacturer of control systems for industrial applications and who discovered further common ground in a consuming interest in hi-fi.

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