Pre/Power Amplifiers

Martin Colloms hears the A&R Cambridge C200/SA200 pre/power duo

These new products from A&R Cambridge have been long in the pipeline. In an unusually brave step for such a small company, it has invested in moulding tooling for the front panels and also the casework of the preamplifier. Its aim was to achieve close tolerances, and considerable effort has been expended in achieving a good fit of parts, particularly for the array of controls on the preamplifier.

Infineon Technologies' Class D solutions have been seen before in audiophile amps, but this is the first to feature gallium nitride FETs. The 'tubes', however, are pure decoration!

Unlike its meaning as a show of arrogance, in a design context a 'conceit' is, variously, 'an ingenious or fanciful comparison or metaphor', 'an artistic effect or device', or 'a fanciful notion'. AGD's £18,000-per-pair Gran Vivace is all three. To understand the utterly bizarre use of a valve's glass envelope as a housing for a solid-state amplifier, think of a similar conceit in another field: smart watches which, instead of emulating Apple's genre-defining rectangle, look like analogue timepieces.

Until the recent addition of high-end Japanese AV processors like Denon’s AVP-A1HD, the upper echelons of the multichannel pre-amplifier market have been dominated by US brands like Lexicon and Krell. Neither of which have ever really got my juices flowing if I am honest. Enter Anthem, a new contender from Canada’s Paradigm stable [see box], with the Statement processor and power amplifiers. It is easier to start with the Anthem Statement P5 and P2 power amps.

Martin Colloms wonders if this all-tube line preamplifier can re-establish Audio Research's supremacy in the exalted reaches of the high-end

As an increasing number of digital source components come equipped with variable output level one might think that line controllers – preamps without a phono cartridge input facility – are an endangered species. This will make sense to those embarking on an all-digital system, mixing a variety of digital sources and prepared to convert from the analogue disc domain to digital via an A/D converter function. Indeed, some digital control units are digital-only and cannot handle analogue signals at all.

A robust design that produces a sound noticeably free of adornment Famous for its uncoloured, bomb-proof monitors beloved of recording engineers the world over, ATC builds not just speaker drive units but also the amplifier power packs for its active speakers in true artisan fashion in its Gloucestershire workshops, populating circuit boards entirely by hand. Similarly, the company’s standalone pre- and power amps are individually hand crafted, only the metal casework is bought in from an external supplier. As mentioned on page 43, we reviewed the P1 and its partnering CA2 Mk2 preamp in March ’10. Since then the power amp has unfortunately crept up in price by some £250.

Very much hi-fi on the grand scale, this Italian-made pre/power amplifier combination is a sweet-sounding heavyweight with more than sufficient output to match its size

For a while, the amplifier combo you see here was almost literally the elephant in the editor's listening room. Delivered for review just at the end of 2018, its sheer mass – 28kg for the £12,500 Strumento No1 mk2 preamp alone, plus a further 95kg for the No4 mk2 power amp, which sells for £16,250 – defied almost all efforts to move it into PM's lab for test work before I could listen. It finally inspired our esteemed editor to relent and buy himself a trolley – and so, at last, the review literally began to roll...

Anniversary edition of the Reference five splits into two boxes for improved performance Released to commemorate the 40th anniversary of the company’s Reference preamp, the Anniversary Ref 5 promises to address the few solutions not available in its recently unveiled single-chassis version. This two-chassis model sees the valve power supply relegated to a box of its own and, being a true dual-mono layout, two fat umbilical cords connect it to the chassis. Under the lid can be found an all-valve, zero feedback, pure Class A circuit employing four 6H30 triodes per channel, again dual-mono, while mounted on the bottom of the main board are four massive custom Teflon coupling capacitors, weighing around a kilo apiece. Each valve is fitted with a now-familiar damping ring; the main circuitry is fitted to a large mother board; daughter boards deal with the front panel and the socketry.