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 […]

Read More

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. […]

Read More

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 […]

Read More

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 […]

Read More

COLIN WONFOR: 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; […]

Read More

EWA / Elsdon 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 […]

Read More

Colin Wonfor’s Clinic: 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 […]

Read More

Colin Wonfor’s Clinic: 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 […]

Read More

Colin Wonfor’s Clinic: 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 […]

Read More

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: […]

Read More

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 […]

Read More

Colin Wonfor’s Clinic: How often do we have to turn off our equipment?

Dear Colin, power supply question. How often do we have to turn off our equipment such as power amp, pre amp. cd player , power conditioner ……? Can we leave them on for days while listening on and off or do we have to turn them off after every session of listening? As a general […]

Read More

Colin Wonfor’s Clinic: That elusive valve sound?

Hello Colin, please be patient with me because although I am an experienced listener I’m not very conversant with the technology that is available today. By this I mean I really just plug in and just listen. However recently I started to think about some of the units I use, In particular a Musical Fidelity […]

Read More

Colin Wonfor’s Clinic: XLR attenuator values

Dear Colin, XLR attenuator values. There is to much gain in my system; DAC outputs 4vrms and amps output full power at 1.6v. What are the correct value attenuators please? Cheers Chris Hi Chris, 1)what impedance are we driving into? 2)what output can the DAC be loaded into? I am going to assume 600 Ohms. […]

Read More

Colin Wonfor’s Clinic: Do slow blow t2 250v fuses blow for no reason?

Hi Colin. Just had a crackle in a left channel (nothing you’ve built by the way), fade to nothing, then that stench of death. Took the lid off my Crimson mono (a simple oblong) and all looks healthy in fact like new, the only thing that’s gone is the fuse. Could it be a mains […]

Read More

Colin Wonfor’s Clinic: 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 […]

Read More