5 Things to Know Before Buying metal oxide film resistor

Alex SE

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Jan 6, I'm wondering if there is a noticeable difference between branded resistors and Chineese resistors. If we say two resistors of the same value, 1/4w, 1% or 5% tolerance, does really matters when it comes to decks and other audio equipment?
I use to buy Vichay in a values I need but I would like to buy a kit and slip chase different values all the time. Neither Mouser or DigiKey have some interesting kit, but I've found these at Amazon. What are your opinions for such resistors, are they suitable for audio?

mr_rye89

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Jan 6, I bought a cheap 5% carbon film resistor assortment some years back. Some resistors were way out of spec (<20%). They are inferior to Vishay in build quality too. How do they compare in sound? I don't know.

I do a lot of work on old radios where precision resistors aren't needed. Something like a phono preamp needs 1% resistors in the equalization network. When I went through my Carver C-1 I didn't touch any of the resistors, which are carbon types and likely 5 or 10%. Some guys replace all the resistors with 1% metal films, Not me....... Last edited: Jan 6,

grapplesaw

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Jan 6, Alex there is a big difference in resistor types and their uses, metal film is desirable for circuit boards and metal oxide where there is high current and heat such as amplifier emitters. Spend some time and read a few of the sites listed in this link below and you will learn about the types , uses and preferences.
https://www.google.ca/search?q=diff...+bad&ie=UTF-8&oe=UTF-8&hl=en-ca&client=safari

20tajk7

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Jan 6, Some metal resistors can be inductive, that can make funny waveforms if used as replacement.

Also carbone resistors have a negative temperature coefficient so that's not good on all circuits.

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Jan 6, I use mostly 0.1% metal film on my phono pre' not much increase over 1%. Time saved testing and pairing too.

RIAA curve within 50mdB of ideal.

Alex SE

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Jan 6, Thank you all for the answers. Question was about differences between cheap and branded metal film resistors, used for audio. I'm wondering if anyone have used those from Amazon/eBay. Would be happiest If there was some store that sells resistors and othher stuff here in Stockholm, but my only/best choice is to order from Mouser or DigiKey and then I have to order for at least 50' to get free shipping.
Have already learned myself to stay away from carbon resistors, so that's out of question.

Some metal resistors can be inductive, that can make funny waveforms if used as replacement. That was exactly what I was wondering. So, same type doesn't mean that they are all made of a same materials and can behave different ways.

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Alex SE

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Jan 6, Seems to bee something really fine and expensive and besides not available, at least in EU.

I'm looking for good enough resistor kit 100Ohm - 1MOhm, reasonably good, don't have to be Sci-Fi. Resistance without side effects.

J!m

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Jan 6, I think induction is a concern with wirewound, not metal film, but please correct me if that's not right....

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Jan 6, I think induction is a concern with wirewound, not metal film, but please correct me if that's not right.... Metal film and metal oxide are very low inductance resistors, generally speaking.

Alex SE

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Jan 8, OK, seems that nobody would bet on Bojack and other Chinese resistors from Amazon.
Was searching around and it seems that some Royal Ohm resistors sold by Taydealelectronics should be good resistors. Besides, those are crazy cheap, 0.015$/pc and can be ordered min 10pcs which is just great since that I would buy 10 or 20 or each of most values. Hope that shipment to EU is not 100$
(direct link to metal film resistors).
Anyone have an experience with Royal Ohm and that seller?

BTW, are these values OK for making a kit (of course, 1% or 5%, not 20%).
Ohm: 100, 150, 220, 270, 330, 390, 470, 510, 560, 680, 820
kOhm: 1, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2, 100, 150, 180, 220, 270, 330, 470, 560, 680, 820 and 1MOhm

Totally 33 values and if we say 1/4W, 1% 500pcs for 7.5$ is literally nothing.

George S.

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Jan 8, I try to use Dale or Yageo 1% metal film for audio projects. Then have a big box of cheap carbon variety pack resistors for other stuff.

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Jan 8, KOA Speer or Yageo make very high quality metal film resistors for audio and other purposes.

Alex SE

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Jan 8, Found these Yageo which are general purpose, should be fine. Maybe not to buy a 200pcs, but maybe 100, since that I have to buy some capacitors too Last edited: Jan 8,

George S.

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Jan 14, Here's a good example of a Yageo 1% metal film resistor. It's shown on the package as 2.49 K ohm 1/4 watt. Measures 2.489 K ohm on the DER EE. Outstanding quality and reasonably priced.
Building the mute boards for the preamps.

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e30m3mon

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Jan 14, Here's a good example of a Yageo 1% metal film resistor. It's shown on the package as 2.49 K ohm 1/4 watt. Measures 2.489 K ohm on the DER EE. Outstanding quality and reasonably priced.
Building the mute boards for the preamps. Got a DER EE coming Monday ... YESS!

Mohawk

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Jan 14, Some metal resistors can be inductive, that can make funny waveforms if used as replacement.

Agreed,

I specifically used non inductive types for my speaker attenuation/protection circuits

Also carbone resistors have a negative temperature coefficient so that's not good on all circuits.

Gepetto

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Jan 14, Got a DER EE coming Monday ... YESS! It is a great little meter. Less bulky than my big bench LCR and just as accurate

e30m3mon

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Jan 14, I appreciate the advice you and George gave on this tool.