COLIN WONFOR: Microphony, fact or fiction?

Colin. I appreciate your no-bullshit approach to providing answers. I am counting one now because I cannot get a credible answer elsewhere re microphony in amps. I appreciate that all objects vibrate and each has a fundamental mechanical resonance. So if microphony affects the sonic performance, then how and why – in general? How would […]

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COLIN WONFOR: Thoughts re the Magnum IA120

Hello Colin. I read the interview. Such a bumpy ride. Congratulations on your ‘re-birth’. Can’t tell if you are into nostalgia but anyway, assuming you are then after all this time, what are your thoughts re your Magnum IA120? I have one. Love it. Curious about IA150 and IA170. Other than power, are there any […]

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Colin Wonfor’s Clinic: What really 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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Colin Wonfor’s Clinic: PSU caps

Dear Colin, PSU caps. There are two (2) large rectangular caps at the ac inlet of the PSU of my DIY amp. They are labeled as such; 0.1uF 250V~X2. What does the X2 mean? Yeah I know, stupid question, but I’m at least looking for a intelligent answer and seeing all the past Colin’s Clinic […]

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Colin Wonfor’s Clinic: Capacitor replacement in vintage Sansui gear

Q: 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? A: […]

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COLIN WONFOR: The fine art (or science, or both?) of cable design

Colin, what are the current design and materials limitations that confront all intelligent skilled speaker cable designers today? It is not materials! it’s understanding that block A can go with block Z. The complex nature of the cable is not a easy thing to write here about.  And I will not be writing about the […]

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COLIN WONFOR: Sanyo Oscon

Dear Colin, Solid organic polymer capacitors such as the Sanyo Oscon series have a very good reputation for digital decoupling and I’d like to use some when refurbishing an old CD player of mine as I’ve got plenty in my parts stash. Before I go fitting any I’ve got a couple of questions:  1)   A […]

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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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COLIN WONFOR: Design priorities

Mr. Wonfor. Do you have any particular priorities, other than the obvious one of sound quality and safety when you approach the design of audiophile amps? To be honest, and this is going to sound/read odd. I normally wake from sleep with ideas, then try them out. For example it a new style of amp, […]

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COLIN WONFOR: 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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COLIN WONFOR: Impedance match of preamp and main amp

Dear Colin, impedance match of preamp and main amp. I am considering mating a McIntosh Mc602 with a Bat Vk 51se. I noticed the input impedance on the Mc602 is 10K. While most Bat amps are much higher. Do you see a problem with this? It seems I remember at Stereophile I used to know […]

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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: Involvement in Trilogy Audio

Hi Colin. Is it true you were involved with Trilogy audio? I have not had any significant input into Trilogy. Nic and I are old friends. We’ve known each other for 30+ years from when he first started. He and I bat ideas of each other and have worked together on other projects, including airfield […]

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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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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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COLIN WONFOR: Accurate & cheap capacitance meters – are there any?

Dear Colin, Accurate & cheap capacitance meters – are there any? Have decided a capacitance meter will come in handy for taking some of the ‘guess work’ out of cartridge loading, in terms of being able to measure the real-world capacitance if my phono cable/head shell wires/connectors together. Only problem is one of budget :/ […]

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COLIN WONFOR: LM3886 Gainclone

Hello Colin. Can you enlighten me please? I’m building a LM3886 Gainclone design for a second system, and have a few questions on the best types of passive components to choose. As it’s a second system, not looking for any exotic/expensive components, just want to make best choice of sensibly priced options, while trying to […]

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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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Howard Popeck speaks at length to people with interesting things to say: Colin Wonfor (Inca Tech, Magnum, Proac-Magnum, T.O.C.A, Naim and Tellurium Q) sets the record straight (Part #2)

Hello again Colin. I guess you hold a couple of patents, possibly quite a few. in layman’s terms – if indeed such a thing is possible – can you explain what these are and perhaps their significance in the audiophile world? Crickey Howard, some of those got back a bit and now and are out […]

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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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