Integrated Amplifiers

If I wasn't averse to tattoos, I'd have one that says, 'Always Read The Owner's Manual First'. I spent so much time trying to illuminate the VAC Sigma 170i's iQ warning lights that I was wondering if the review sample was a dud. Doh: in this application, the £10,000 single-chassis alternative to the Signature stack [HFN Mar '21], they don't light up at switch-on. Here they only work when something is amiss. Blast it! I never did see them in action.

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].

Not long into my audition of Copland's CSA150, I began to feel a little annoyed that, at some point, I'd have to unplug it and send it back. Reviewer remorse isn't quite as galling as buyer remorse, but it is still 'a thing', and this £4988 hybrid tube integrated had given me a bad case of it. Hybrid? Yes, for the CSA150 looks to be an upscaled CSA100 [HFN Aug '20] combining a 6922 double-triode and solid-state FETs in its preamp stage, driving a bipolar transistor amplifier output. Perhaps keen to avoid overselling the benefits of this architecture, Copland warns buyers not to expect 'the warm and nice, coloured charm of some older tube designs'.

In previous vintage reviews we have featured the Technics SL-10 turntable [HFN Apr '19] with its footprint the size of an LP sleeve, Sony's D-88 CD player [HFN Jul '16] that was so small the disc stuck out of its side, and Technics' SB-F1 speakers [HFN May '17], which individually could be held easily in the palm of one's hand. So how about a complete integrated amp about the same size as the concise edition of the Oxford English Dictionary? Meet the Aurex SB-A10 from 1981.

Manufacturers should not be criticised for responding to changing tastes. CD has forever changed the face of hi-fi, so all you're doing when you mourn the passage of the phono stage is increase the value of shares in sackcloth and ashes. Instead, be thankful that the companies in the high-end are intent on making the best line-stage amplifiers they can design. What you use for a phono section can be either your existing, pre-CD preamp or an outboard phono section. With this in mind. Bill Beard has launched an all-valve, line-level-only integrated amplifier, the first product to bear his new company's name.

Browse the catalogue of Colorado's PS Audio and you'll find both monstrous and slimline monoblock amps – the BHK Mono 300 [HFN Jul '16] and Stellar M1200/M700 [HFN Jan '21 and Apr '20], respectively – together with stereo power amplifiers, streaming DACs, integrated amps and preamps. And then there's the Stellar Strata, which in some ways is a distillation of PS Audio's diverse product line and tech into one box.

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.