Pre/Power Amplifiers

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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.
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.

Hi-Fi News Staff  |  Jan 22, 2015
Schiit products benefit from a Scandinavian nomenclature – Asgard, Bifrost, et al – so, should this stunning little Magni headphone amplifier prove tempting, you needn’t approach the salesman with the embarrassing request, ‘Do you stock Schiit?’ As its company founders are seasoned designers of [quote], ‘fully balanced differential power amplifiers, fully discrete I/V conversion stages, audiophile D/A converters, relay-switched stepped attenuator volume controls in preamps, etc,’ they could have launched Schiit with whatever product genre they liked. Being savvy, they chose headphone amps. Schiit works with ‘simple, discrete circuit topologies’ for the analogue sections, while its DAC products feature ‘innovative bit-perfect management systems’. It also uses Class A amplifier designs ‘where practical – and single gain stages when possible’.
Hi-Fi News Staff  |  Nov 13, 2014
On seeing Siltech’s pre/power combo you might think it incorporates a separate power supply. In fact, this unusual design splits the power amplifier into separate interstage (voltage gain) and current amplifier sections. The combo’s C1 tube preamplifier (pictured) features a rechargeable battery power supply as does the V1 voltage stage of the two-box power amplifier. Of course, running the complete V1/P1 amplifier from a battery would be wholly impractical, so the P1 is mains powered.
Hi-Fi News Staff  |  Nov 13, 2014
At the heart of Simaudio’s 380D DAC/preamp is its M-AJiC32 processing (Moon Asynchronous Jitter Control in 32-bit mode) and at the core of this is an eight-channel ES9016S Sabre DAC from ESS. Simaudio claims to have further improved jitter performance with its own ‘Alpha Clocking System’. The 380D has separate power supplies, each with a toroidal transformer and 11 stages of voltage regulation, for its digital and analogue sections. The analogue stage is a fully differential circuit and balanced XLR connections are strongly recommended, although RCAs are also provided.
Review: Andrew Everard, Lab: Paul Miller  |  Mar 26, 2020
hfnoutstandingIn one swipe, the long-awaited 860A v2 replaces Simaudio's 860A, 870A and 880A power amplifiers and promises 870A performance. We pair it with the 740P preamp

There's something very 'old school' about Simaudio's latest MOON pre/power combination: both units certainly look the part in their combination of black fascias and exposed metalwork, though you can also have them in all-silver or all-black, where they have an air about them of being stripped for action. The £7800 740P preamp, for example, eschews the current trend for digital inputs and network streaming capability, and is a simple, direct, all-analogue line-only affair.

John Atkinson  |  Dec 24, 2021  |  First Published: Aug 01, 1983
hfnvintageJohn Atkinson heats up his listening room with a Class A amp from Krell

It used to be said that the only true way to learn was to find out something for yourself, then it will stick when all book-learning has long since been shed. This was drummed into me when I was working on the development of LEDs (green ones, to be precise).

Review: David Price, Lab: Paul Miller  |  Apr 01, 2018
hfnvintage.pngIt was an amp that gave fresh meaning to the term 'cooking on gas', but how does one of Sony's last classic super-integrateds shape up today? Time to find out...

The '70s was a time of great social change. At the beginning of the decade, black and white TVs, bicycles and outside toilets were the reality of life for many British people. But by the end of the '70s, most folks had colour TVs, family cars and swanky modern bathrooms – along with fitted kitchens, wall-to-wall carpeting and stereo systems in their homes. Although the music centre was the height of fashion, separates hi-fi was growing fast and many were willing to pay for serious equipment.

Review: Andrew Everard, Lab: Paul Miller  |  Oct 10, 2022
hfnoutstandingGermany's 'Sound Performance Laboratory' has launched its largest stereo power amp yet. We pair the s1200 with SPL's Elector preamp for a big-hearted, all-analogue system

Based some 40 minutes west of Düsseldorf, SPL sounds like an attractive prospect for those who like their music loud – though in this case the name has nothing to do with Sound Pressure Level, standing instead for 'Sound Performance Laboratory'. Mind you, the promise of room-shaking raises its head again with the new flagship power amplifier in the company's domestic – or 'Professional Fidelity' – range, which promises 'Mastering Grade Listening'. The new Performer s1200 (£6499) may only measure a smidge under 28cm wide and a little over 20cm tall, making it a tiddler in the pantheon of high-end stereo power amps, but it's still capable of a claimed 300W/8ohm, rising to 520W/4ohm. This should be more than enough for even the most demanding speakers and level-hungry listeners.

Review: Tim Jarman, Lab: Paul Miller  |  Dec 01, 2017
hfnvintage.pngDesigned by James Sugden in collaboration with Richard Allan, is the second iteration of this milestone Class A transistorised amp the one to buy? It's time to check it out...

The late '60s provide an interesting choice of equipment for the vintage hi-fi enthusiast. The rapid development of high-quality transistor amplifiers during the period resulted in some intriguing models and the Sugden A21 is a fine example. Why? Because it was the first successful domestic hi-fi amp on the UK market to offer a fully transistorised implementation of Class A.

Review: Mark Craven, Lab: Paul Miller  |  Jun 16, 2022
hfnoutstandingNow a full quartet, T+A's compact but beautifully formed Series 200 has expanded to include a media player, DAC/preamp and Purifi Eigentakt Class D stereo power amp

Siegfried Amft, founder and MD of T+A, declares the intent of the brand's Series 200 is to 'combine the appearance of a Midi system with a high-end performance'. Midi, of course, is a word that evokes memories of 1980s/'90s hi-fi, so I'm surprised to see the term attached to a range that's rather more aspirational in its technology. You might think something has been lost in translation, T+A being a German manufacturer, until you lay eyes on the DAC 200 and its button-heavy compact chassis. From the appearance side, at least, the 'Midi' mission has been accomplished.

Review: Andrew Everard, Lab: Paul Miller  |  Dec 01, 2018
hfnoutstanding.pngThe sound of music is raising the rafters in Eastern Westphalia as Germany's T+A celebrates its 40th anniversary with a set of very special monoblock hybrid amplifiers

Not so much monoblocks as monoliths, these new flagship power amps from Germany's T+A certainly have what you'd call 'in room presence'. At least they do when you have got them in position, a task hampered by the fact each is a 50kg+ dead weight, although admittedly the two substantial handles sprouting from the top panel – and the assistance of a friend – will help.

Review: Andrew Everard, Lab: Paul Miller  |  Nov 12, 2020
hfnoutstandingWith some sensible internal revisions, the German company has made its heavyweight preamplifier even more precise and detailed, without sacrificing any of the music's soul

You can tell a lot about a company from the title it takes for itself – from the name of the founder to classical or musical allusions to the equivalent of go-faster stripes, every brand seems to set out its stall in a somewhat different way. German manufacturer T+A elektroakustik is no exception, except here the name – the initials stand for 'Theorie und Anwendung', Theory and Application – is saying 'we're no-nonsense, and led by engineering'. Or, as the company puts it in a brief bio, 'Actually we're scientists…'.

Hi-Fi News Staff  |  Jan 20, 2015
Each of these three units – preamplifier, two-channel power amp and a power supply to ‘beef up’ the power amp’s performance – is housed in an all-aluminium chassis identical in size and appearance. Pre and power amp are ‘double mono’, the left and right channels both electrically and mechanically separated, with power supply sections, audio circuits and control electronics all in shielded chambers. The new P3000HV preamplifier has a comprehensive functionality that includes an analogue tone processor module to provide bass/treble adjustment, a user-variable ‘loudness’ control to suit your loudspeakers’ sensitivity, and parametric equalisers for tuning your speakers’ bass performance to your listening room. Illuminated touch-sensitive controls allow access to the preamp’s configuration menu, and a headphone amp is built in as well.
Review: Mark Craven, Lab: Paul Miller  |  May 20, 2024
hfnoutstandingComplete with a new streaming module, T+A's latest network-attached DAC/preamp is the perfect partner for its PA 3100 HV integrated and A 3000 HV power amplifiers

Tipping the scales at a hefty 26kg, measuring a portly 46cm deep and 17cm tall, and selling for £14,900, T+A's PSD 3100 HV appears every inch the flagship DAC/streamer/preamp. Except that it isn't – that accolade is reserved for the German brand's SDV 3100 HV [HFN Oct '19], which has been deemed its 'reference' model since its arrival in 2019 and remains available for £26,040.

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