Trying to find an 18.5ohm 25w resistor

[Sloan]

Hi,
I'm having a heck of a time finding an 18.5ohm 25w sand resistor. Found some on ebay, but would like to find an electronics supplier cause I need to order more parts as well.

Would like to replace with original value etc...



I have tried:
Mouser
Newark / Element 14
Jameco
Allied
Digikey
MCM
B&D
Parts Express
Allelectronics
BG Micro

[g1]

That's a 5% tolerance resistor, so why not just use an 18 ohm, it will still be within tolerance.
Is that what burnt so badly at the far left of the picture?

[Sloan]

Yeah, this is a crossover. It got hot, the insulation caught on fire, then the hot melt glue and wood caught on fire and two resistors burned up. Kinda wild.

This isn't mine and I would like to replace with the same components originally used if possible.

[52 Bill]

Yeah, this is a crossover. It got hot, the insulation caught on fire, then the hot melt glue and wood caught on fire and two resistors burned up. Kinda wild.

This isn't mine and I would like to replace with the same components originally used if possible.

You don't mention if you tried the original manufacturer or not. What brand is this speaker? How are you going to deal with the burned board?

[J M Fahey]

18 ohms *is* the original spec.

A label saying "18.5" is generic, it means the original one can be anywhere between 17.575 and 19.425 ohms, so 18 ohms exact is *well* within spec .

FWIW, I suspect the original designer made a calculation , result was 18.5 ohms, and he was anal enough to specify *exactly* that and nothing else.

Supplier certainly pulled, say, 500 18 ohms resistors out of his last batch of 50000 or 100000 , labelled them "18.5" and charged double the standard price.

[Enzo]

That is not a standard value, not in 5% resistors. So it is clearly a custom part. Your could make one up from several resistors, but that is silly. The only place you are going to find one is from whoever made the speaker. Or from a dead speaker.

As was said above, it is a 5% part, so the value can be off about an ohm in either direction and the part will be within its specs. Just use an 18 ohm part.