Resistor orientation: looking for a lost page...

[Nounours18200]

Hi friends,

By reading various pages on the capacitors best orientation (meaning how to locate the outer foil), I had found a person who had also tested the resistors orientation just after having tested the capacitors orientation.

But I cannot find again this article ...

If some of you knows articles talking about this, I am interested !

Thanks,

[gmphadte]

If they r snake oil treated, u have to worry for the orientation.

[kevinkr]

Originally Posted by Nounours18200

Hi friends,

By reading various pages on the capacitors best orientation (meaning how to locate the outer foil), I had found a person who had also tested the resistors orientation just after having tested the capacitors orientation.

But I cannot find again this article ...

If some of you knows articles talking about this, I am interested !

Thanks,

As stated somewhat less kindly in a previous post conventional 2 terminal resistors are not orientation sensitive..

[davidsrsb]

Most types are physically symmetrical, so stray capacitance will not depend on orientation

[VictoriaGuy]

And (just to add to the pile-on) many people think/feel/believe that with modern capacitors, the orientation doesn't matter. (Most modern caps don't even have the 'foil' marking, IME.)

Even in old gear, the 'foil' orientation on the paper/wax caps was only used in RF equipment (and not always, even then).

[simon7000]

Many of the film resistors have spiral grooves in the film for higher values of resistance. Some claim an advantage to using two in inverse parallel to reduce the inductance. Theoretically that exists, the valid issue would be if that is enough of a difference to be heard.

Capacitors should of course be used with the outer foil at ground potential and if driven then the outer foil to the drive side.

[Nounours18200]

Thanks Friends

[Enzo]

The main reason to orient resistors all the same direction is that it looks neater when you are done.

[kevinkr]

Originally Posted by simon7000

Many of the film resistors have spiral grooves in the film for higher values of resistance. Some claim an advantage to using two in inverse parallel to reduce the inductance. Theoretically that exists, the valid issue would be if that is enough of a difference to be heard.

<snip>

I have heard this too, but honestly how much mutual inductance is there going to be between two spiral cut resistors next to each other, since they are not on a common core? I would expect it to be singularly ineffective.. Blackgate advocated this for some of their non-polar caps based on the idea that the ESL would cancel - and I have exactly the same objection to it..

[simon7000]

Originally Posted by kevinkr

I have heard this too, but honestly how much mutual inductance is there going to be between two spiral cut resistors next to each other, since they are not on a common core? I would expect it to be singularly ineffective.. Blackgate advocated this for some of their non-polar caps based on the idea that the ESL would cancel - and I have exactly the same objection to it..

Two of the same inductors in parallel have half the inductance to start with! Any extra reduction is a bonus!

There is a standard for orienting resistors. 1st band to the left or top!

I was also hopeful someone would know about the article asked about. Sometimes in what seems quite silly there is a bit of interesting information.