is it Fake AB resistor

kwm488 · 17th August 2007, 08:02 PM

Hi

i buy a AB resistor from the store. the seller say it is NOS AB resistor. but i really don't know it is AB or not.

do any people help me check it and let me know how to check it
thank

Netlist · 17th August 2007, 08:39 PM

Pardon my ignorance, but what is AB?

/Hugo

mzzj · 17th August 2007, 08:48 PM

Quote:

Originally posted by Netlist
Pardon my ignorance, but what is AB?

/Hugo

Audio-Bullshirt maybe?

or
Allen-Bradley

Geek · 17th August 2007, 08:59 PM

Hi,

Impossible to tell from the pic.

I used a LOT of those in my old TV tech days and a good way to tell is hook it up to a dc power suppy and run at the max ratings for 10 minutes. A real AB will not fracture or get noisier than a carbon comp already is. Wear eye protection, a bad resistor can go off like a grenade!

If the Ebay seller is a reputable fellow, they either are real AB's or were bought by him at a surplus auction in good faith that they were.

Cheers!

kwm488 · 18th August 2007, 02:45 PM

hi

thank for reply

i am helpless now

my question is that is my board use a real Allen-Bradley
resistor

i really don't know how to check it is real or not.

in fact, is it possible to take a look , so i know it is fake or not

some people say check the space of the color code on the resistor

SY · 18th August 2007, 03:03 PM

What makes the brand so important?

There are several different kinds of resistors on that board. Are there some specific ones that you have concerns about?

Netlist · 18th August 2007, 03:05 PM

What Geek said.

If they explode, who cares as you rightfully don't want fakes.

If they stand the test, they are real.
Note that I blindly believe Geek's advice.
And I wear glasses.

/Hugo

poynton · 18th August 2007, 03:11 PM

Quote:

Originally posted by SY
What makes the brand so important?

Quote:

Originally posted by mzzj

Audio-Bullshirt maybe?

kwm488 · 18th August 2007, 03:20 PM

hi

i don't know and no gear to do the resistor test.

but i have cut some ab resistor. and all inside is carbon.

i remember one web say ab should carbon layer when you cut it.
do any people know this , do you mind to let me know more

thank

Eva · 18th August 2007, 03:58 PM

I think that receiving fakes in exchange for a lot of money is a very fair punishment for anybody expecting "better audio performance" from particular brands or series of resistors (or capacitors). The market is probably flooded of fakes with no end buyer noticing. There is a lesson to learn there.

BTW: In my experience, 0.25W and 0.5W resistors will handle the rated power (and more) without damage (but getting somewhat hot), no matter who made them.

18th August 2007, 03:03 PM	#6
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	What makes the brand so important? There are several different kinds of resistors on that board. Are there some specific ones that you have concerns about? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

18th August 2007, 03:58 PM	#10
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	I think that receiving fakes in exchange for a lot of money is a very fair punishment for anybody expecting "better audio performance" from particular brands or series of resistors (or capacitors). The market is probably flooded of fakes with no end buyer noticing. There is a lesson to learn there. BTW: In my experience, 0.25W and 0.5W resistors will handle the rated power (and more) without damage (but getting somewhat hot), no matter who made them. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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17th August 2007, 08:39 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Pardon my ignorance, but what is AB? /Hugo

17th August 2007, 08:59 PM	#4
Geek diyAudio Member Join Date: Sep 2004	Hi, Impossible to tell from the pic. I used a LOT of those in my old TV tech days and a good way to tell is hook it up to a dc power suppy and run at the max ratings for 10 minutes. A real AB will not fracture or get noisier than a carbon comp already is. Wear eye protection, a bad resistor can go off like a grenade! If the Ebay seller is a reputable fellow, they either are real AB's or were bought by him at a surplus auction in good faith that they were. Cheers!

18th August 2007, 02:45 PM	#5
kwm488 diyAudio Member Join Date: Aug 2007	hi thank for reply i am helpless now my question is that is my board use a real Allen-Bradley resistor i really don't know how to check it is real or not. in fact, is it possible to take a look , so i know it is fake or not some people say check the space of the color code on the resistor

18th August 2007, 03:05 PM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	What Geek said. If they explode, who cares as you rightfully don't want fakes. If they stand the test, they are real. Note that I blindly believe Geek's advice. And I wear glasses. /Hugo

18th August 2007, 03:20 PM	#9
kwm488 diyAudio Member Join Date: Aug 2007	hi i don't know and no gear to do the resistor test. but i have cut some ab resistor. and all inside is carbon. i remember one web say ab should carbon layer when you cut it. do any people know this , do you mind to let me know more thank

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