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Old 17th February 2013, 09:02 PM   #1
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Default Low noise resistors, cheap, 1/4 watt 1/8 watt

Looking for a source for low noise resistors, cheap, 1/4 watt 1/8 watt with leads.
For an amp.

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Old 17th February 2013, 09:27 PM   #2
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Get them from Digikey, I got some good ones 1% 1/4 made in Japan.
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Old 18th February 2013, 06:09 AM   #3
h_a is offline h_a  Europe
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About all metal film resistors from brand manufacturers are low noise with the thermal noise being dominant (and impossible to get rid off). Or are you talking about carbons?
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Old 18th February 2013, 07:06 AM   #4
tinitus is offline tinitus  Europe
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bought some 3/4 0,5watt Welwyn
they are relatively big size, and reminds me I need something smaller as well

but should not be hard to find cheap resistors if audiophile prices is considered normal standard
but I think the Welwyn sounds good enough

what is considered 'cheap' ?
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Old 18th February 2013, 07:27 AM   #5
tinitus is offline tinitus  Europe
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hmm, the smaller ones cost more ?

looks like small carbon film is cheaper ?
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Old 18th February 2013, 09:35 AM   #6
DF96 is offline DF96  England
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Almost all modern resistors are 'low noise' by the standard of the 1960s. The exception is carbon composition, which is still available for certain purposes such as pulse applications.

Use carbon film or metal film. If you want really low noise then use wirewound.
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Old 18th February 2013, 11:58 AM   #7
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I've been paying as low as $.006 each for house brand metal film 1/4 watt resistors, at newark.com. I won't buy less than a dozen at this price, the bag costs more. They were produced in Thailand.
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Old 18th February 2013, 12:04 PM   #8
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Any body have any experience with Vishay Dale CMF Industrial resistors?
Low noise?
Sound good?
Any cheaper sources?

I found Vishay Dale CMF Industrial resistors at Newark:
Excellent high frequency characteristics
Exceptionally low noise; typically 0.10 μV/V
Low voltage coefficient to 5 ppm/V
US - Electronic Components Distributor | Electronic Parts Distributor | Newark

Vishay CMF data;

While looking for low noise resistor I found this doc about Vishay bulk foil.
Seems to have good data explaining why my ears like them when I use them. Expensive.
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Old 18th February 2013, 12:50 PM   #9
SY is offline SY  United States
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Understand that there are two noise sources in resistors:

1. Johnson noise- this depends on the resistor value and has nothing to do with how the resistor is made. It is a fundamental property of the universe. You can only reduce it by lowering the temperature.

2. Excess noise- this does depend on resistor construction. Wirewound are lowest, metal film slightly higher, carbon composition much higher. For most values of resistance, the Johnson noise will swamp excess noise for metal film and wirewound.

Your noise will hardly be affected if you switch between a 4 cent metal film and a $40 bulk foil (or whatever fancy resistor suits you). Best strategy is to buy a name-brand (e.g., Vishay, Ohmite) metal film and use a higher wattage than necessary to avoid heating. If matching and long term stability are important (e.g., equalization resistors, plate loads for LTP), your resistors can be pre-baked.
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Old 18th February 2013, 02:07 PM   #10
dodo is offline dodo  Poland
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CMF55 Industrial have ferouss endcaps.
Somehow I feel better , knowing there is no ferouss material in the signal path
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