I was wondering how one goes about identifying an Allen Bradley resistor. I bought some older resistors from a local place and they were the old type(round,even, and 10% tolerance).....I don't have a digital camera to post a picture. Maybe someone has some insight or even pictures so that I may be able to identify Allen Bradley resistors.
Thanks,
Robert
Thanks,
Robert
I will raise this thread from the dead because I am wondering the same thing and there is no reason to have 2 threads.
Vintage Allen Bradley are usually carbon comp hot molded from what I know, although they now have multiple modern resistor manufacturing methods for their current product lines.
We are both talking about vintage ones though. If they are hot molded, should there be a small line visible at both ends of the resistor that goes along one side also? Or should it be a perfectly smooth cylinder? How about how they attached the leads to the ends of the resistor? Anything stand out on that part of the construction vs. other vintage resistors? I have about 300 vintage carbon comp & super old wire wound ceramic resistors from a 1950's organ. They used some top dollar parts (at the time) such as Mallory and Temple capacitors, so I would expect the resistors used would also be high-end.
I will post some pictures soon. I just hope the reason people didn't answer your question isn't because it is nearly impossible to tell between random vintage resistors and Allen Bradley resistors. (Fingers crossed!)
Vintage Allen Bradley are usually carbon comp hot molded from what I know, although they now have multiple modern resistor manufacturing methods for their current product lines.
We are both talking about vintage ones though. If they are hot molded, should there be a small line visible at both ends of the resistor that goes along one side also? Or should it be a perfectly smooth cylinder? How about how they attached the leads to the ends of the resistor? Anything stand out on that part of the construction vs. other vintage resistors? I have about 300 vintage carbon comp & super old wire wound ceramic resistors from a 1950's organ. They used some top dollar parts (at the time) such as Mallory and Temple capacitors, so I would expect the resistors used would also be high-end.
I will post some pictures soon. I just hope the reason people didn't answer your question isn't because it is nearly impossible to tell between random vintage resistors and Allen Bradley resistors. (Fingers crossed!)
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All the A-Bs I've ever seen have smooth bodies, fully saturated color bands of very even width and thickness, and solder/tin plated leads. The product is just very uniform.
Hello guys, I can get these old computer circuit boards. Do you think that these resistors are allen bradley?
Best regards, Michal
Best regards, Michal
An externally hosted image should be here but it was not working when we last tested it.
It's very hard to tell for certain; AB resistors like most color-banded resistors never had a specific logo on them. They certainly had very carefully placed and uniform color bands and I see some 2-watt resistors I would tentatively identify as AB. I can't be certain of the half-watt resistors, too small to see any details.
Because they're carbon composition, I'd be reluctant to reuse them.
Because they're carbon composition, I'd be reluctant to reuse them.
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