Pre/Power Amplifiers

Ever get the feeling we've been here before? Well, the arrival of the latest amplifier system from Musical Fidelity brings a new twist to the whole déjà vu thing as the Nu-Vista naming and macho aesthetics are familiar from the historically hefty Nu-Vista 800 integrated amplifier [HFN Nov '14]. In practice that classic nuvistor tube-equipped integrated amplifier, also rated at 300W/8ohm, has provided the inspiration for both the industrial and technical design of the PRE and PAS we see here, the hybrid nuvistor/transistor concept now evolved into a pre/power set-up, complete with separate PSUs for each. So one box is now four...

While some brands maintain a steady rotation – evolution – of their products, others, including Constellation Audio, hit on the jackpot early and feel little inclination to change a winning formula. So while we've already tested the £73,500 Centaur II 500 power amp [HFN Dec '19] we missed out on the £53,998 Constellation Centaur II Stereo. Until now...

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.

Unlike the traffic on the motorway for which this stereo amplifier is definitely not named, Canadian manufacturer NAD is rolling along at pace. The M23 auditioned here, available in just a silver finish, is its latest amp to feature high-performance Purifi Eigentakt Class D technology, following in the footsteps of the £3999 M33 BluOS-capable integrated [HFN Aug '20], the seven-channel £4499 M28 power amp, and the more affordable £1749 C 298 stereo amp [HFN Oct '21]. That NAD should have chosen to adopt Eigentakt modules for a trio of models before upgrading its flagship two-channel Masters series power amp is perhaps something of a surprise. But it proves to have been worth waiting for.

This isn't our first encounter with the valve amplification from Swedish company Engström, the ERIC Encore power amps [HFN Oct '21] lighting our blue touch paper of interest. The ARNE integrated amplifier, its 'entry-level' offering, is quite possibly an amp best suited to what comedy writer Danny Robins made famous as 'The Cold Swedish Winter', it also doubling as potent heat source. The curvaceous glass cover protecting the pairs of power triodes gets very warm indeed, so this amp needs plenty of 'fresh air'.

Avoirdupois aside, Dan D'Agostino Master Audio Systems' Momentum M400MxV monoblock just may be the least fussy or fiddly power amp one can aspire to in the extreme high-end. Of course, something cute and tiny like a PS Audio Sprout [HFN Feb '15] or Quad Vena [HFN Jan '15] can be lifted with one hand and requires no degrees in electronics, but that's 'real world' gear. At £90,000 per pair, the M400MxVs are as exclusive as it gets, and such a strong physical presence is de rigueur.

The name of this new product from Polish company HEM, selling under its Ferrum brand, is spelt ERCO, but pronounced 'ertso'. Apparently it's Esperanto for 'ore', and so follows on from the mineral-based brand-identity – Ferrum, OOR – you get the idea. What's also not immediately apparent, given that all the Ferrum products basically look the same, is that the £2395 ERCO is perhaps the most comprehensively equipped model the company has made to date.