EWA: Alan Elsdon / Colin Wonfor – Top resistors

Dear Colin, Top resistors. Many threads with opinions on boutique coupling capacitors, but very little consolidated information on the sonics of resistors. Do you care to share your thoughts on the attributes of their favorite brands & types for specific tube and SS applications? How much of a difference does a good resistor make? My […]

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EWA Elsdon Wonfor Audio: Mr. Wonfor answers your question: 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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EWA: Alan Elsdon / Colin Wonfor – 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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EWA Elsdon Wonfor Audio: 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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EWA Elsdon Wonfor Audio: 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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EWA: Alan Elsdon / Colin Wonfor – What are computer grade parts?

Dear Colin, Computer grade parts? What are computer grade parts.. such as Computer grade power-supply caps? Are these type of parts an upgrade and/or better than audiophile grade parts? For example, I’ve heard some people say, “I’ve upgraded my power supply caps in my amp to computer grade caps”. I don’t think I’d want computer […]

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EWA Elsdon Wonfor Audio: 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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EWA: Alan Elsdon / Colin Wonfor – Capacitor replacement in vintage Sansui gear

I know vintage gear isn’t your business of course but, hey, I trust your expertise and so I wonder if you can help with a component issue please? I’m doing a Sansui restoration and the main caps are Nichicon & Elna. There are many differing capacitor ranges, do you have any specific recommendations? Firstly is […]

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EWA Elsdon Wonfor Audio: 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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EWA Elsdon Wonfor Audio: A stand-alone MM/MC phono stage in 2017?

Hello Colin. I get the impression that your primary interest is in pre and power and integrated amplification. That said you do make, or have made in the past excellent phono stages built into your amplification. These are I believe highly regarded and yet as far as I can tell have no adjustment controls, by […]

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EWA: Alan Elsdon / Colin Wonfor – Transformer noise through speakers when switched off!

Dear Colin, step up transformer noise. I purchased an amp from Europe that needs 240v [ I am on north American voltage].. I bought a step up/step down transformer to equalize the voltage. it works, but the transformer produces noise through the speakers, even when the amp is turned off. the transformer I bought was […]

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EWA Elsdon Wonfor Audio: 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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Ask an expert: Musical Fidelity Tri-Vista 300 integrated amplifier

Howard, what’s your opinion on the Musical Fidelity Tri-Vista 300 integrated amplifier? The one I owned was one of the best MF amps I ever encountered. I say this despite the fact that I resigned the franchise. In a nutshell, it’s a minor classic in the making. Howard Popeck hp@no-alibi.demon.co.uk

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