COLIN WONFOR: HB100 mono power amps test review

Neil McCauley / editor in chief Why no images? Because the test review that follows here are of a pre-production pair in casework that doesn’t properly represent the finished product which, so we are told, should be available in early March 2017. Priced, including VAT @ £4.6k per pair. A bit of history Please note […]

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COLIN WONFOR: LS-25 speaker cables

It is amusing watching forum members casually slagging off such things, but Colin Wonfor is certainly no ‘subjectivist quack’, and it is very interesting indeed how well his cables are received and positively regarded. Dip in and out HERE ===//=== Please click HERE to access the entire BRITISH STEREO archive Please click HERE to see […]

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COLIN WONFOR: LS-XXV speaker cables test review

Colin wonfor has just sent us this review. Mike Tierny (Proclaim Audio) writes: Colin and Alan, thank you for the opportunity to audition Elsdon Wonfor Audio’s LS-XXV speaker cables for review. I must tell you, as a “certified cable nut”, I am mightily impressed. I have run the gamut of speaker cables over the past […]

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COLIN WONFOR: Replacing ceramic resistors in Monitor Audio GXC350 speaker

Hello Colin. Great series so far. Thank you. A little background info: I own a Monitor Audio GXC350 centre speaker and have discovered the midrange driver produces no sound. Swapping the driver over with one from a GX200 confirms it’s ok. A volt meter shows there’s no output to the midrange driver which points to […]

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COLIN WONFOR: Discusses his MC-V power cord

Editorial note: Written by Alan Elsdon and Re-engineered by Colin Wonfor (above) Q: Looking at the EWA power cord – your MC-V – it doesn’t look anything special. But knowing you, there’s clever engineering that’s gone into it and so a few questions if I may. Let’s start by looking at the topic through the […]

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COLIN WONFOR: Battery drive for amplification

Hi Colin. Fashions, come fashions go and from time to time the market has been presented with battery powered devices from preamps, phono stages and power amps. As far as I’m aware you’ve never thought of anything battery driven. Is any particular reason for this? I’m wondering if you think the claimed sonic benefits are […]

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COLIN WONFOR: M50 power amplifier test review

Alan Brown writes: Since when will an amplifier sound better the louder it plays? Sure, louder can be more exciting, more visceral, but usually there’s a point where things get ‘ragged’. This can manifest as harshness, sibilance, collapse of soundstage or loudness. Yes, I said loudness, which seems to me to be an artifact of […]

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COLIN WONFOR: Zero autoformers; how to measure impedance please

Dear Colin, Zero autoformers; how to measure impedance please? I got a pair of Speltz zero autoformers recently but when I measure the total impedance, my multimeter sees only 0.4-0.6 ohm no matter what I do. It seems the multimeter could only read the DC resistance from the autoformer itself but not the total impedance […]

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COLIN WONFOR: Do very good interconnects compensate for an only so-so CD player?

Dear Colin, An audiophile friend made the following argument to me: “Stop looking for a new CD player. With a very good to excellent high-end interconnect you will not only improve the performance of the CD, but other downstream components.” I had to disagree with my friend claiming a $400 or $500 IC is not […]

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COLIN WONFOR: Q&A regarding their new HB100 mono power amps

HP: Gentlemen, you’ve been designing amps and preamps for over 30 years. Is it still a challenge and ….. are you having fun? A: Colin has been designing electronic professionally for over 40yrs. He has done this for a living. His many designs include power control and power supplies Linear, Resonate, Switch Mode and even […]

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COLIN WONFOR: Boutique brand, or mass-market gentlemen?

Hi Colin. First. Congratulations on rising phoenix-like from a difficult time with difficult people! From what I have read my impression is that you are intent on keeping Elsdon Wonfor Audio small; a boutique-brand if you will. However for the sake of conversation, or curiosity or whatever, if you wanted to, could the company be […]

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COLIN WONFOR: What is it that causes output transistors to blow?

Dear Colin, Generally speaking, what is it that causes output transistors to blow? Do they tend to die a natural death? Bad drivers? Emitters? Problems with the rectifier circuit? Assuming there wasn’t shorted speaker wires or excessive moisture. The amp bias and the +/-77 voltage was fine before they blew. It happened on power up. […]

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COLIN WONFOR: Power cord optimum length. A scientific basis or merely hype?

Here’s one for you electric wizards to kick around. Whilst attending a recent hifi exhibition I was doing some power cord shopping. At one particular display I was being told by a very well known cable company representative, I’ll not mention the name so it doesn’t influence any responses, that the rule of thumb is […]

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COLIN WONFOR: Audiophile fuses

Hello experts. I have used audiophile fuses for years in various equipment without problem, generally appreciative of sound quality improvement. Recently, I’ve encountered problems with audiophile fuses blowing in my Coincident Turbo 845SE amplifier. At this point I’ve had two failures of Synergistic Red Quantum 6.3a 250v sloblo fuses in this amp. Recently I discovered […]

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