Resistor Identification Help

ridikas · 25th November 2011, 08:25 PM

For the longest I've been trying to identify these resistors. I would like to find out the brand and model number if possible. Any help would be greatly appreciated.

They are metal film, light blue in color, and have a 6 band color identification. They are approximately 7mm X 2.5mm.

The closest that I've found are the old Roederstein Resista MK3 resistors.

Here are some pictures:

thaumaturge · 08:58 PM

Look like Dale's. Don't know model numbers.
Doc

Like these Vishay/Dale's: Digi-Key - BC27KW-2TR-ND (Manufacturer - PR02000203272FR500)

jeronimo2003 · 25th November 2011, 08:56 PM

Philips SFR25 or nowadays VishayBCC SFR25 5% metal film.

madtecchy · 25th November 2011, 09:21 PM

Hi
The Last two bands look like brown and red in the piccy. If that is correct .

Brown = +- 1% Red = 50ppm . Im Guessing you already know that.

ridikas · 26th November 2011, 06:00 AM

Thanks for all of the help. Yup, the last two bands are brown and red on all of the resistors. They are 1% and 50ppm. I suppose this rules out the Vishay BC Components SFR25, as they are all 100-250ppm, even though visually they look very similar. Also, the SFR25s are marked with only either 4, or 5 band color identification, whereas the mystery resistors are all 6 band.

Any other ideas, or suggestions?

ridikas · 26th November 2011, 06:24 AM

I think I've found them. Thanks to Jeronimo2003 for pointing me in the right direction. I believe they are Philips MRS25. Here is a picture from an eBay seller, they look identical and have identical specs:

Elvee · 26th November 2011, 07:15 AM

I am sure they are of german origin, but I can't remember the exact manufacturer.

mjf · 26th November 2011, 07:40 AM

hello.
this could be a (vishay) beyschlag res, mbb0207 (1%, 0.6w,50ppm).
here is a picture of a new one with rohs conformity.

madtecchy · 26th November 2011, 07:45 AM

Hi

Out of intrest what are these resistors installed in.

Im guessing with the simple exterior of resistors lots will look exactly the same.

Regards Ian

ridikas · 26th November 2011, 07:49 AM

I found them! They are Philips MRS25 and are now made by Vishay. They look and spec identical. Thanks to Jeronimo2003 for pointing me in the right direction. Here's a picture of some for sale on eBay:

25th November 2011, 08:42 PM	#2
thaumaturge diyAudio Member Join Date: Aug 2011 Location: Utah	Look like Dale's. Don't know model numbers. Doc Like these Vishay/Dale's: Digi-Key - BC27KW-2TR-ND (Manufacturer - PR02000203272FR500) __________________ Ne timeas a facie mulierum ea ignorare Last edited by thaumaturge; 25th November 2011 at 08:58 PM.

26th November 2011, 07:15 AM	#7
Elvee diyAudio Member Join Date: Sep 2006	I am sure they are of german origin, but I can't remember the exact manufacturer. __________________ . .Circlophone your life !!!! . . ♫♪ My little cheap Circlophone© ♫♪

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25th November 2011, 08:56 PM	#3
jeronimo2003 diyAudio Member Join Date: May 2010	Philips SFR25 or nowadays VishayBCC SFR25 5% metal film.

25th November 2011, 09:21 PM	#4
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	Hi The Last two bands look like brown and red in the piccy. If that is correct . Brown = +- 1% Red = 50ppm . Im Guessing you already know that.

26th November 2011, 06:00 AM	#5
ridikas diyAudio Member Join Date: Nov 2011	Thanks for all of the help. Yup, the last two bands are brown and red on all of the resistors. They are 1% and 50ppm. I suppose this rules out the Vishay BC Components SFR25, as they are all 100-250ppm, even though visually they look very similar. Also, the SFR25s are marked with only either 4, or 5 band color identification, whereas the mystery resistors are all 6 band. Any other ideas, or suggestions?

26th November 2011, 07:45 AM	#9
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	Hi Out of intrest what are these resistors installed in. Im guessing with the simple exterior of resistors lots will look exactly the same. Regards Ian

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