So I have been working on a BASH amplifier out of a Triad Silver Omnisub and have come across a resistor that I’m having a hell of a time identifying the value of. It reads at very close to
39 ohms, but from the colors of the bands on the resistor, I’m stumped as to what it’s original value is supposed to be. the reason I am drawn to it is because right next to it is an 8 pin connector that definitely appears to have gotten very hot. Hot enough to make the plastic on the connector super brittle and discolored, even the connector that’s attached to the wire that inserts into it became super brittle and slightly broke when carefully disconnecting it. I’ll include a photo of that as well. Any help would be greatly appreciated. Oh, and this is on the preamp board.

It has 4 bands, and this is the best I can make the colors out as:


1–brown or maybe red
2–gold or maybe green
3–black
4–black

 

I think it's plausible that Orange-White-Black-Brown (39Ω, 1%) could look like that after cooking. That's the wild card here - the color shift due to heating. Your guess is as good as anyone else's.

If you can find a user's forum for that device, someone might help you out by looking at their own and even putting a meter on it. It's unlikely but not impossible that a service manual or schematic exists somewhere.

 

The resistor does not look burnt, so if you read 39 ohms, that is probably what it really is. It may have been running hot, but not hot enough to burn up. The plastic was just too close to a heat source...
It could be just that the plastics used in that board were not well suited to the application. Or, a poor solder joint on that resistor may have cause heating of the board itself at the joint. Other possibilities are that there was improper cooling (air flow) around the board due to dust/lint, blocked vents, dead fan, etc. A poorly crimped pin in that connector, or loose connector pin itself could have caused heating of the pin in the cable assembly.

 

The resistor isn't the bad guy. Something else caused it to get hot.

 

Thanks everyone, much appreciated!