On a board with few precision resistors will have a small total cost impact. The voltage coefficient is the change in resistance with respect to the change in the voltage.
2 Watt Metal Oxide Resistors
Metal Oxide Carbon Film Metal Film Resistors Index
Metal Film Resistors Explained Applications Advantages Availability Etc
Metal oxide film resistors have a better voltage coefficient and temperature coefficient than carbon film resistors.
Metal oxide resistor vs carbon. Metal oxide is used for screen grid and power resistors. The carbon composition resistor was the mainstay of the radio and television industries prior to world war ii. Over time they can drift in value so they need to be replaced for the amp to sound the same or sometimes to even work correctly.
Compared to carbon film the prices are just as low. Carbon has no real advantage except that they are cheaper. Their construction features carbon particles in a diallyl phtalate resin binder.
Carbon films are a little quieter but not as quiet as metal film metal oxide or wirewound resistors. Metal film produces less thermal noise than carbon. The key deciding factor between wirewound or metal film precision resistor technology is depends on the application.
The predominant noise in carbon comp carbon film metal oxide and metal film is composed of contact noise which can be very large at low frequencies because it has a 1f frequency characteristic. Any modern metal oxide resistor will by far out. Metal film resistors also typically have a much lower inductancecapacitance than carbon so theymetal film work better at higher frequencies.
In some positions they can catch fire if something goes wrong. Metal film is typically used nowadays for a plate load resistor instead of the old carbon comp. So now we have narrowed down the comparison to wirewound resistor vs metal film resistor.
Wirewound resistors do not have this noise only resistors made of carbon particles or films. Key difference metal film vs carbon film resistors most metal film resistors and carbon film resistors have a similar appearance and shape but the key difference between metal film and carbon film resistors is that metal film resistors use a metal film to limit the flow of electric current whereas carbon film resistors use a carbon film to limit the electric current flow. The significant exceptions are where carbon comps are used to maintain a vintage appearance or in plate loads where their poor stability is useful in tone shaping.
Carbon film is frowned on by the boutique amp dudes. The conductive path is from particle to particle each of which touches another along the path. Also failure rates are high with carbon based resistors.
Only for dissipation values above 1 watt combined with reasonable stability the carbon film resistors are still more cost efficient. Most current production amps use carbon film and metal film not carbon comp and metal oxide in the preamp signal path. For basic use metal film and metal oxide film are currently the predominant resistor types.
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