Integrated Amplifiers

Launched as part of Rotel's 60th anniversary celebrations, this is the latest version of the brand's flagship 'big integrated' amp – and there's rather more to it than meets the eye

Rotel's larger integrated amplifiers have always provided an attractive waypoint between the compact designs of hi-fi's affordable end and the monster amps of the high-end, offering plenty of power, an extensive feature-set and an entirely convincing performance. The new RA-1592MKII, selling for £2295 in black or silver finishes and claiming a 200W output, is no exception.

Not only did this '80s amp claim to tackle distortion using the company's new 'Super Feedforward System', it was also priced to have mass appeal. How does it sound today?

When the Sansui AU-D33 integrated amplifier was launched in 1982, it had a lot to live up to. Its predecessor, the AU-317II from 1980 [HFN Jun '15], delivered the sort of performance one would expect from a manufacturer of specialist hi-fi, thanks to its well engineered DC-coupled circuitry. The company's 'All hi-fi, everything hi-fi' slogan set out a clear manifesto – no transistor radios, no coffee machines, just quality audio products.

The TA-1120 stereo amplifier was a step-ahead design which combined power, quality, reliability and compactness in a way that had not been seen before, but which in a few years would become ubiquitous across the ranges of Japan’s major hi-fi brands. In 1968 the original TA-1120 was replaced by the TA-1120A, as tested here, the addition of a headphone socket and the removal of a ‘safety’ indicator light being the only obvious external clues as to which model is which. Revisions were also made to the preamplifier circuit. The main selector lever gives a choice of phono 1 (MM) or tuner, along with a central position that selects a rotary control giving four further options, eg, mic, tape head, second MM turntable and line-level auxiliary input, which can be used to connect a CD player.

This famous French brand was launched in 1956 – the very same year as Hi-Fi News – and continues to cut a very distinctive path. We test its latest tube/hybrid integrated

When your brand has been around for over 60 years, designing a new integrated amplifier becomes a matter of balance. You need to weigh up the company's rich heritage with electronics that compete with the best new kids on the block. Perhaps something to caress the ears with valve warmth and character, combined with the grunt of a transistor output to drive even the most reticent of speakers? Enter the Supravox Vouvray.

Having nailed the whole 'one box system with built-in speakers' category, T+A now shifts tack to a 'just add speakers' unit. It's on-trend, and with substance to match the style

Are we downsizing, simplifying, or just looking for more from less? Whatever the reasons, it seems the one-box system, to which one only needs add some speakers, is in the ascendant. There's no denying a movement is growing, with everything from 'more integrated' amps complete with onboard streaming through to complete systems such as the NAD M10/M33 [HFN Jun '19 & Aug '20], Naim's Uniti range [HFN Mar '11 & Nov '17] – which was in the vanguard of this trend back in 2009 – and the recently-announced Cambridge Audio Evo models [News, HFN Jun '21].

Germany’s T+A has spent the last couple of years developing a completely new range of all-solid-state electronics: its ‘HV Series’. Built into an all-aluminium case, the PA 3000 HV amplifier’s individual sub-assemblies are screened in separate chambers. An upper compartment houses the preamplifier and voltage amplifier stages, while the electronic control processor and circuitry for driving the display screen – fed by a separate power supply arrangement – sits in a recess machined out of the 40mm-thick aluminium front panel. A 10mm-thick dividing wall shields the top section from the left/right current amplifier stages and the unit’s massive power supply is in a lower compartment.

The latest addition to the Italian manufacturer's range is said to be a ground-up design to make the most of its hybrid – valve preamp, solid-state power amp – configuration

Based in Treviso, Italy, Unison Research has long specialised in making very traditional looking tube amps with polished wooden chassis and rows of glowing bottles on display. At the same time its Unico series has adopted a more mainstream aesthetic and includes valve-based amplifiers that, well, don't really seem like valve amplifiers. Despite an outward appearance suggesting a completely conventional integrated amp, the Due – which sells for £2500 in standard silver with black available at a £100 premium – is very definitely a valve amp, or at least half of one.