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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OH DEAR: Amplifier buzz even when power switch is off!

Dear Colin, I need some theories and hopefully answers please. This is a situation, neither I, not anyone who I asked, have encountered before. It is very simple and puzzling at the same time. Here it is: There is a faint buzz coming from the amplifiers, NOT the speakers, barely audible from a few feet […]

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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: 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: 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 […]

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Passive preamps, the downside.

Hello Colin. I’m sure you’re aware of passive preamps such as Music First. I don’t think you’ll sort person to comment negatively on a particular brand but I do wonder what your views are on such devices? Not wishing to anticipate your answer, I’ve listened to the MF device and been very impressed by the […]

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ELSDON WONFOR AUDIO: LS-XXV (LS-25) speaker cable test review

Alan Brown writes ….. Obscenity My problem with high-end cables is that it’s possible to spend truly obscene amounts on them. Obscene, because it seems to me many offerings to the audiophile market are overpriced hype with no real merit. Well it does seem like that doesn’t it? I mean ….. that’s the easy stance; […]

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AUDIOPHILE FUSES: Nonsense or what?

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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PSU, material being the limiting factor perhaps?

Hello Colin. From reading your very cogent and helpful answers to those questions here I appreciate that you take the design of power supplies very seriously. I’m writing here out of ignorance of the design process and indeed materials used but I wonder if it’s coming to the point where the next set of advances […]

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Why sell an under-optimized item that can be easily improved upon by the owner or a modder?

Dear Colin, If audiophile grade feet, power cords, and fuses can really improve sound quality, why don’t high end designers/manufacturers just incorporate these audiophile grade components at the time of build? Why sell an under-optimized item that can be easily improved upon by the owner or a modder? I guess you don’t do that at […]

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COLIN WONFOR: A clean sheet of paper?

Colin – I’m curious about the gestation process you go through designing a new product. How do you normally operate from, say, a clean sheet of paper? Nice question Yes and No is the answer. I love the question. The answer is ‘yes’ for totally new concepts for me.  Getting the prototypes right means confronting […]

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COLIN WONFOR: Q-20-P preamp and Q-20 power amp test review

Neil McCauley writes: First, here’s how the makers describe their units: Q-20-P The Q-20-P complements the Q-20 power amplifier, it features MC, MM and one line input, a line-level output and a headphone output. The Q20P is designed to be as simple as possible in order to maintain signal integrity. It is ideal for the […]

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When/why did capacitor value standards change?

Dear Colin, a question which has been nagging away for a few days now: why were capacitor value ‘standards’ changed around early 70s, and why such seemingly arbitrary numbers? In my Quad 33/303 there’s several electrolytic caps featuring values such as 2uF, 12uF, 25uF, 50uF, 100uF….. When (and why) were values changed to 10uF, 22uF, […]

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My meter isn’t going to zero any more on ohm ratings

Dear Colin. My meter isn’t going to zero any more on ohm ratings, and it apparently can’t be calibrated. It’s a fairly low-end Radio Shack autoranging model. I saw that the “what do you need for repairing equipment” on a US thread suggested a Fluke 114 or 115. Is that still the best, or do […]

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The Art of Electronics (Horowitz & Hill) 3rd ed; still the best?

Dear Colin, The Art of Electronics (Horowitz & Hill) 3rd ed… … as DIYers probably already know is now out, only 25 years after the 2nd ed. My copy arrived today. I’m not trained in electronics and make no claim to more than a passing knowledge, but have enjoyed these authors’ style of presentation since […]

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HEADPHONE AMP CLASS A: JLH Class A headphone amp build help needed!

Dear Colin, I’d buy from you but as far as I can see one4audio. don’t make one – or do you or will you? Anyway, I’m planning on building a JLH class A headphone amplifier but am a bit confused regarding the transformer wiring/connection. The pcb requires 15v-0-15v AC power input. I plan on using […]

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