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Old 23rd May 2006, 09:25 PM   #1
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Default Audio Research Resistor Type

Hi. Does anyone knows what type of resistors (the big blue ones on the image) Audio Reasearch is using in most of his recent tube circuits?

Thanks in advance...
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Old 23rd May 2006, 09:57 PM   #2
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look like Riekens to me.

mike Percy has 'em
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Old 24th May 2006, 01:53 AM   #3
mach1 is offline mach1  Australia
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Riekens have gold plated leads - from what I can see these look silver.
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Old 24th May 2006, 10:42 AM   #4
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You're are right, these are not Riken resistors. The Riken don't have this shape and are of a darker blue.

Any more suggestion?
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Old 24th May 2006, 04:37 PM   #5
kevinkr is offline kevinkr  United States
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They appear to be Roederstein Resista MK3 (1/2W) and MK8 (2W). These are available from Michael Percy, note that the MK3 has been discontinued and Mike is replacing values with PRP made replacements as he runs out. I think the PRP are at least as good as the MK3 or perhaps even a little better sounding.
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Old 25th May 2006, 12:12 AM   #6
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Exactly, they seem to be of this type. Thanks for the info.

Bye...
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Old 25th May 2006, 12:27 AM   #7
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Now that you mention it, I did not notice the leads and I would concur as well.
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Old 25th May 2006, 12:30 AM   #8
rdf is online now rdf  Canada
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Hi Kevin, do you mind expanding a bit on your experiences with the PRP? It's fascinating that posted opinions almost universally discount it using terms which make it sound terrific. Too clean, too neutral, too many adjectives normally considered complimentary.
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Old 25th May 2006, 02:13 PM   #9
kevinkr is offline kevinkr  United States
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Hi RDF,
Elaborating slightly, the description you cited to me describes the attributes of a good possibly ideal passive component. I would consider this synonymous with transparency, something I aim for. I don't really think that any passive component should behave like a tone control, unfortunately quite a few do. Ever notice how different like value coupling capacitors sound, and how invariably the better ones are horrendously expensive?

Call me a purist, but I want to hear the music with as little interpretation by passive components as possible, and I normally strive to design and build circuits that are low in coloration. (I don't always succeed, but I'm usually at least pleased with the result.)

I am not a big fan of some of the boutique components described as having a specific sound, particularly if that description does not include transparency.

Oh, and I am an analog engineer by profession, and previously spent 14 yrs designing audio equipment in various guises so my opinions are very suspect..
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Old 25th May 2006, 07:34 PM   #10
rdf is online now rdf  Canada
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Thanks! I trust you like them then, even given your professional background. I agree with you and should have specified 'posted opinions elsewhere', Audioasylum for example. They took a hammering over there. At $0.40 per, there's no reason not to give them a shot. Snappy colours too.
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