Lab: Paul Miller

It's not unusual for a successful hi-fi product to be updated with mild revisions during its lifetime. Often the changes are minimal: a tidied-up fascia to match a new model added elsewhere in the range, or an extra function or minor circuit redesign. This was certainly not the case with the Leak Stereo 30 Plus amplifier of 1969, which replaced the Stereo 30 [HFN Oct '10] first seen in 1963. Side by side the two looked much the same, but inside the 30 Plus was all new in order to take advantage of improved technology.

Given that pretty much every component AVID has ever offered is still in production, it's clear company owner Conrad Mas does not chop and change designs on a whim. So it's no surprise that when it comes to turntables AVID has largely stuck with the thinking behind its very first deck, the Acutus, which was launched in 1999.

Writing in his Welcome page last month, editor Paul Miller explained how shifting hugely heavy equipment about is all part and parcel of the HFN reviewing 'experience'. Perhaps he was eyeing a recent speaker launch proudly declaring that its new products weigh over 450kg apiece. Add on their external crossover with its power supply, and a quartet of high-quality amps to drive them, and you could well end up wondering whether your floor will support a tonne and a half of hi-fi.

Franco Serblin, who passed away in 2013, first unveiled his flagship Ktêma in 2010. He had left Sonus faber, which he founded in 1983, in 2006, so the Ktêma was in development for nearly five years before he felt it was ready to be sold by the new company bearing his name. I remember the tension during its gestation, and Franco's elation at being able to produce a no-compromise system – not that he was ever restrained at Sonus faber. Think of the phenomenal Extrema, Guarneri and Stradivarius. The wait for the Ktêma proved worth it – as did the anticipation lasting a decade to hear a pair in my own system.