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Identifying Allen Bradley resistors
Identifying Allen Bradley resistors
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Old 18th July 2003, 12:01 AM   #1
rdunnit is offline rdunnit  United States
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Default Identifying Allen Bradley resistors

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
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Old 17th October 2017, 08:37 PM   #2
ZoSoNCSU is offline ZoSoNCSU  United States
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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!)

Last edited by ZoSoNCSU; 17th October 2017 at 08:40 PM.
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Old 17th October 2017, 11:49 PM   #3
Damon Hill is offline Damon Hill  United States
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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.
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Old 19th October 2017, 02:58 PM   #4
sumotan is offline sumotan  Indonesia
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Me I always remember AB for its smooth body & coffee color
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