Post subject: Re: Using very old carbon resistors?
Posted: May Sun 06, 2012 2:54 am
Member
Joined: Jan Thu 01, 1970 1:00 am Posts: 389 Location: Tulsa, OK, USA
Interesting, thanks for the info. I'll have to look for the rivet in reg tubes. I wonder why this resistor goes down in value? But thinking a bit about it after this.....hmmmmm... why do others go up? Some materials science I didn't learn about! Hank
Post subject: Re: Using very old carbon resistors?
Posted: May Sun 06, 2012 3:21 am
Moderator
Joined: Jan Thu 01, 1970 1:00 am Posts: 28955 Location: Livermore, CA
Without use many carbon resistors go up in value. Under high current and over heating they can go down. Believe this is caused by a resistor burning and turning to carbon? It then goes down in value and conducts even more current until sometimes burning in half.
Post subject: Re: Using very old carbon resistors?
Posted: May Sun 06, 2012 8:29 am
Member
Joined: Oct Sun 11, 2009 10:06 am Posts: 1441 Location: British Columbia
Norm Leal wrote:
Without use many carbon resistors go up in value. Under high current and over heating they can go down. Believe this is caused by a resistor burning and turning to carbon? It then goes down in value and conducts even more current until sometimes burning in half.
