STAR EARTHING: What is it and what’s the point?

Hello Howard. Can you ask Colin please what is star earthing and does he / will he using it in his new designs? Ta muchly J.N Peterson {Colin} Dear J.N.Peterson star earthing should be used in all analog designs, that is a single zero or earth for every component on the circuit board and normally […]

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Equipment break-in; fact or fiction?

Hi guys. Is there or will there be an ‘official’ Elsdon Wonfor Audio policy on this. Here’s my view. I’m an adherent to the psychological theory of so-called break-in; it’s simply one’s brain adjusting to a new piece of audio equipment. I also like to compare it to the ancient therapy of acupuncture; break-in apparently […]

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LFD AUDIO: Bews views: The thoughts, opinions and observations of Dr. Richard Bews:

Dr. Bews – as I understand it, volume controls of all kinds affect sound quality in negative ways, some more than others. Is there one type of level control that’s better than all others and if so, why? Also, how do your findings impact on future LFD designs? A: All pots have different sounds, even […]

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STAX: UA7 UA-7 tonearm

I write from Italy because I’ve the possibility to buy an old but in very good conditions UA-7 tonearm. I’ve a Denon DP 3000 turntable with the original plinth and I’d like to know if the tonearm can be mounted in this deck (if you have experience in this mode. Is there the possibility to […]

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TIME COHERENCE – or what?

Mr. Wonfor / Mr. Elsdon. Am I correct in thinking that correct time coherence of all frequencies is inherent in music? If I have understood this them I guess it means that the sound of a human voice, for example, is time-coherent in all frequencies in a waveform that in itself is a specific time […]

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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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MONITOR AUDIO: Replacing ceramic resistors in 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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BI-WIRING: A daft idea or what?

Gentlemen – what is this ‘thing’ called bi-wiring and will Elsdon Wonfor Audio be making speaker cables that use this tecnique? Thanks. Ron McQueen. {Colin} Dear Ron, bi-wiring is used to stop the reflection signal of one or more transducers affecting the movement or control of another. This can happen and it is caused by […]

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Ask Mr. H: STAX 2020 + NAIM CD5-X

I have a Stax 20/20 basic system which I have acquired from a friend recently. My problem is when directly connected from my Naim CD5X CD player (RCA output) I get some distortion in sound as I crank up the volume to higher level on the energiser. My interconnects are QED approx £20 according to […]

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High quality “audiophile” grade sub panel

Dear Colin, audiophile grade sub panel and breakers? Do you know of a high quality “audiophile” grade sub panel? I read an article from someone in the audio industry where he mentioned having used a GE industrial grade 225 amp panel with a super duty silver plated copper bus bar and bolt on low noise […]

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COLIN WONFOR: An active speaker perhaps?

Hi Colin. Have you ever considered getting involved in active speaker design? From what I can gather, this is quite a complex task to get it right which is why, apparently so few companies get involved. I’m wondering if perhaps at some point in the future you might consider taking a good quality passive speaker […]

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External power supplies?

Hello Colin. I seem to have read somewhere that you feel that external power supplies for audiophile equipment Is really an irrelevance if the original power supply design has been correctly implemented. Have I got that right? If not, can you put your views to us? Thanks in advance, Nigel Okay, I did say that […]

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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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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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OUTPUT TRANSISTORS: What is it that causes them 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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QUAD: What wire for rewiring their power amps please?

Dear Colin, I’ve just picked up a Quad 405 ready for service. When I serviced my previous 405 I used the Dada kit which came with the necessary wire. Can you tell me please what size / gauge wire I should use to replace the existing power wires? Would this be suitable? http://www.rapidonline.com/design-te…0m-reels-62317 or could […]

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STAX: Unreliability?

Gentlemen, which era of STAX headphones are more reliable. Old or new? Howard Popeck writes as follows: First things first, I’ve not been involved in selling STAX equipment for some years and so my comments and observations are based on my experiences then and not currently. They’re called ‘Earspeakers’ incidentally. Old or new is not […]

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SANSUI: Capacitor replacement in vintage units

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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Ask Mr. H: MICHELL ENGINEERING: Orbe versus old Pink Triangle PT2, LFD Audio copper reference, SME 4 – and more

Hello. I am using an Orbe with and Audio Origami breathed-on Zeta arm with a Benz Glider plus an LFD Audio copper reference arm cable. I also have a PT2 which is in need of quite a bit of tlc – I mean to get it working properly – would you expect it to be […]

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