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Old 20th August 2008, 05:01 PM   #1
rtate is offline rtate  Canada
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Default Signal path Resistor Quality

What are the best resistors to put in the signal path of a pre-amp.
The values that I need are 50-60kohm.
I am thinking of using Caddock or Vishay.

Which is better for this application??

Or is there something even Better??

Thanks
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Old 20th August 2008, 06:38 PM   #2
MaxS is offline MaxS  France
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Metal resistor. Not carbon one.
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Old 20th August 2008, 06:43 PM   #3
rtate is offline rtate  Canada
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For sure I am going to use "metal film"
But I would like to know waht the best choice is for the
Signal Path...
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Old 20th August 2008, 08:39 PM   #4
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Quote:
Originally posted by rtate
For sure I am going to use "metal film"

What's so sure about it? I like Shinkoh tantalums or Riken carbon films as much as Caddocks. A Vishay or Caddock is certainly a safe choice but neither can be pronounced best in all situations. It's your ears and system - if sound is important to you be prepared to make the effort and compare yourself.
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Old 21st August 2008, 02:48 AM   #5
Bonsai is offline Bonsai  Taiwan
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I'm quite sure that between metal films, the effect on sound is negligible is at all.

Of course, cheap carbon composition resistors are more noisy.

analog_sa, since you seem to have a lot of comments about componenets, you must have one hell of a system. Can you share the detials with us?
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Old 21st August 2008, 03:00 AM   #6
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Bonsai, you are 20 years behind us.
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Old 21st August 2008, 03:54 AM   #7
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Default Moving Target

I have lately started using Dale RN55E for most applications. I have a lot of surplus bulk metal foil resistors from Texas Components, but think the Dales are just as good.
I picked up some ultra low TCM Dale PTF-56 resistors. Used them as a buffer, between a chip and series output coupling cap. I am not totally sold, need to swap them out for some RN55E of the same svalue to see. But I suspect the difference in the resistors is swamped by the non-linearities of the 10 ufd electrolytic coupling caps. The chip is single rail, there are several volts polarizing the cap.
I really think that resistors are not a big deal. Built a LOT of quiet circuits with AB carbon comp. Also built a lot with Vishay S102. I think that better quality resistors are wasted in most applications. But use a magnet to check for steel leads or end caps. Avoid those.

George
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Old 21st August 2008, 04:16 AM   #8
Bonsai is offline Bonsai  Taiwan
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John,

can you tell us precisely how the sound is affected, since in the overall amplifier cct we are unable to measure any differences (note I am talking about audio ccts - not RF).

I am not proposing using cheap resistors, but please help me understand how two good quality metal films can make a clear audible difference where that difference cannot be measured.
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Old 21st August 2008, 04:27 AM   #9
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We have been formally evaluating resistors since the middle '80's. Beyond excess noise, which can be important, lead material and attachment makes a BIG difference. You can find articles on resistors in 'Hi Fi News' in the mid '80's.
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Old 21st August 2008, 04:43 AM   #10
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Is there any measurable data on these "differences" ?
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