metal film or carbon film?

[Roushon]

purchased a bulk amount of resistors from auction. these are mixture of metal film and carbon film resistors. how do i distinguish which one is metal film or which one is carbon film?

thanks

[analog_sa]

You listen to them.

[SY]

I tried that and they didn't make any noise. Even when I put them into a nice, big pile and cupped my ear near it, they were absolutely silent.

Roushon, you might consider sacrificing a few; break off some of the conformal coating and take a look at what the resistor element looks like.

[JensRasmussen]

Carbon types are often 5% with 3 colour rings with one gold (5%)
Metal film types are often 1% and have more rings than the carbon types.

Try posting a picture of them, maybe we can sort it out this way

\Jens

[Mr Evil]

Quite often metal films are blue and carbon films are beige.

[zanash]

Rarely ....banded ones are any good sound wise. Look for the closer tolerance like .1% and .05%. Again these will varry in sound considerably.....in my opinion the best sounding are welwyn, holco, vishay......then there are the exotic types !

[Roushon]

the following are some details of the resistors. these are exactly what I read on the resistors.

1. 5 colour bands
2. 6 colour bands
3. JV-8K2, single yellow band
4. 1X-22R, single yellow band
5. 4 colour bands
6. FAC-1K1, single blue band
7. GWC-10K, single blue band
8. GXC-48R7, single blue band
9. GAC-56K2, single blue band
10. GU-150K, no colour band
11. GXC-3K83, single blue band

i do not have a digi-cam. so i am not able to show the pictures.

[Roushon]

Originally posted by JensRasmussen
Carbon types are often 5% with 3 colour rings with one gold (5%)
Metal film types are often 1% and have more rings than the carbon types.

Try posting a picture of them, maybe we can sort it out this way

\Jens

i guess that the resistors 1,2,6,8,9,11 above are metal film.

[peranders]

Originally posted by Mr Evil
Quite often metal films are blue and carbon films are beige.

The colour of the body is no indication at all. Metal flim can also be beige.

[Mr Evil]

Originally posted by peranders

The colour of the body is no indication at all. Metal flim can also be beige.

Nothing external is any certain indication - both the body colour and the tolerance can be anything for either type, but usually they follow a pattern.