Investigation

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Steve Harris  |  Dec 01, 2018  |  First Published: Feb 12, 2019
Thinking about tweaking your valve amp by swapping out the tubes? Steve Harris has the inside track on the payoffs and pitfalls of tube rolling…
Barry Fox  |  Nov 01, 2018
Barry Fox takes the stress out of connecting your hi-fi to the Internet

My shiny new hi-fi has all the usual knobs, buttons and meters on the front, and all the usual analogue and digital input and output sockets on the rear. But there's also what looks like an overgrown telephone socket on the back, labelled 'Ethernet'.

I'm assuming that this is for service engineers or connecting the component to a PC, which I don't want to do. I just want to continue listening to my music from high quality sources, through my trusty big box speakers, without getting into the hassle of computing.

Barry Fox  |  Sep 01, 2018
Out of sight, out of mind and very much at risk... Barry Fox explores the preservation of digital music files and why you should take action now

The recent movie Bombshell: The Hedy Lamarr Story, nearly never got made. Which would have been a pity because it tells the intriguing story of how the glamorous film actress (legal name Hedy Kiesler Markey) and her husband, composer George Antheil, filed for a US patent in 1941 on the frequency-hopping, spread-spectrum communication technology that underpins modern wireless networking, including Bluetooth and Wi-Fi.

Ken Kessler  |  Aug 01, 2018
As one of Quad's longest-serving employees hangs up his soldering iron, Ken Kessler talks with Ken Bunting about a lifetime working on iconic kit

It was 15 years since I had interviewed Ken Bunting, in charge of Quad's service department, but back then it was to pick his brains about the company's history. Early this May, I had the privilege of repeating the interrogation, on the occasion of Ken's retirement. Off to the wilds of Cambridge, where I found him on his last day, in a busy-as-ever service area with everything from Quad ESL63s to valve units being repaired – contrary to any rumours or worries that the company had abandoned its legendary back-up division.

Keith Howard  |  Dec 04, 2019  |  First Published: Jul 01, 2016
Keith Howard revisits the question of headphone headband resonance

Shortly after my first Investigation into headphone headband resonance was published [see HFN Jun '14], Owen Jones – he who designed THX's Achromatic Audio Amplifier circuit – pointed out to me that I could have done a better job of it.

Keith Howard  |  Dec 03, 2019  |  First Published: Jun 01, 2014
Do headphone headbands carry unwanted sound? Keith Howard finds out

Imagine that instead of each of your stereo loudspeakers sitting in splendid isolation, optimally aligned with respect to the listening seat, there was a large band of metal or plastic curving between them, joining the two cabinets. If you know anything of loudspeaker design and the efforts taken to quell structural resonances, you'd immediately suspect this structure of colouring the sound and – by carrying vibrations from one speaker to the another – of messing with the stereo image.

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