COLIN’S TECHNICAL CLINIC: Hum and woofer oscillation

Q: Colin – help required please! Hum and woofer oscillation… I have just rearranged my system and entire room. This has lead me to run my Pioneer PL-707 with Denon DL-301II through an AU-320 SUT to my (freshly recapped) Accuphase C-200 and on to my little Cayin TA30. It’s the smallest amp I have and […]

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THE AUDIO MISER (25/09/2020) BASS DRIVERS – NOT ON EBAY: Today’s catch

$95 … https://tmraudio.com/speakers/speaker-parts/hivi-research-d10g-10-kevlar-paper-woofer-single-bass-driver/ £49 … https://www.trademe.co.nz/electronics-photography/home-audio/speakers-and-stands/other/listing-2794838588.htm OFFERS INVITED … https://www.canuckaudiomart.com/details/649649913-seas-p14rc-h-395-mid-bass-driver-from-shahinian-diapason/ £98 https://www.usaudiomart.com/details/649648225-803s-bampw-bass-driver/ $234… https://tmraudio.com/speakers/speaker-parts/hivi-research-d10g-10-kevlar-paper-woofer-single-bass-driver/ $120 CAD … https://www.canuckaudiomart.com/details/649614785-kef-b139-race-track-bass-driver/ OFFERS INVITED … https://reverb.com/item/3269605-midrange-speaker-digital-audio-studio-reference-series-ii-5-25-chrome-mid-bass-midrange-driver-pmr $350 CAD https://www.kijiji.ca/v-haut-parleurs/ville-de-montreal/tannoy-3112-td12b12-12-320-watt-12ohm-super-bass-driver-woofer/1490405740 Please click HERE for all the Audio Miser groups PRIVATE AND TRADE ADVERTISERS CAN ADVERTISE FREE OF CHARGE   British / European loudspeaker members’ group

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TECHNICAL: 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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TECHNICAL: Popping noise on turn off

Q: Hello Colin. The unit in question is a Lafayette 4 channel decoder. When turning off my system, there is a popping noise from the rear speakers unless I turn the volume down on the decoder first (I’m only using the rear outputs). I’d like to eliminate the problem. I’ve searched bypass capacitor and coupling […]

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COLIN WONFOR: Vishay looks good

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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IMPEDANCE: Match of pre / power amps

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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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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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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Step-down transformers with unchanged mains frequency?

Hi Colin, Pls can you help me? Can I safely run a USA spec amp designed for 110v 60Hz in the UK on 240v 50Hz, with a step down transformer (but it will still be 50Hz). So many conflicting views across the web. I think a lot of people believe it can work ok the […]

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PS AUDIO: If for some reason your power amplifier puts DC into your loudspeaker you’ll …

Paul McGowan writes: If for some reason your power amplifier puts DC into your loudspeaker you’ll wind up letting the magic blue smoke out and killing your loudspeaker.  ”Magic blue” smoke is engineering humor: it’s what we jokingly say when a component blows up and smoke spews from its innards – “oops, we let the […]

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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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IMPEDANCE: How to measure it?

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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INTERMODULATION

When we think about distortion products we are generally referring to the harmonic kind. Harmonics are naturally occurring byproducts of sound: a plucked string will generate the intended frequency (called the first harmonic) and then higher versions of that note, each slightly less loud than its predecessor. These higher frequencies are all integers (whole numbers) […]

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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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PS AUDIO: Sonic texture

Paul McGowan … Describing what we hear as having a texture is an interesting Audiophile term.  What’s the texture of a violin or a tuba?  Do these instruments even have a texture?  Not really,  this is yet another term used to describe something we hear in a manner that is easier for us to relate […]

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