5W R22J Resistor In Speaker, Need Replacement - Page 2 - diyAudio
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Old 3rd May 2013, 08:03 PM   #11
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On Ebay, use a search string such as "0.22 ohm 1% wirewound" 0.25 ohm turns up a few more choices. Also search with Vishay, Dale, or Mills, and see what turns up. It may take a while, and you might find it helpful to exclude terms: -carbon -smd etc.

The Usual Suspects (your pricey audiophile parts stockist) will stock Mills, such as percyaudio.com

But it never hurts to cruise Ebay and see if someone's got good parts at better prices. If I weren't chronically broke I'd be picking up a bunch of Russian polystyrene 1% or better caps for calibration standards, for example.
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Old 3rd May 2013, 08:46 PM   #12
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Thanks so much, i'll do some looking now.

The stock is 5W, 5% Tolerance, 0.22ohm, and 400 PPM/C.
Hope i can find a 1% with 50PPM/C, it's going to be one hell of a task.
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Old 3rd May 2013, 08:54 PM   #13
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Quote:
Originally Posted by Damon Hill View Post
Higher wattage won't change anything except the size of the part; it may not be possible to fit neatly.
.
A higher wattage wont get as hot for the same temperature input.

If I need a 5 watt resistor I usually use a 10 watt resistor to keep the temperature down a bit. While the same amount of heat is dissipated it is done over a wider area and so runs cooler.

While these resistor will stand a lot of heat sometimes they can get hot enough to melt their mounting solder if run near their limit !
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Old 3rd May 2013, 08:58 PM   #14
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I found the following:

1. 5W, 1% Tolerance, 90 PPM/C, and -65 C to +250 C
RS005R2200FE12 Vishay/Dale | Mouser

2. 5W, 1% Tolerance, 90 PPM/C, and -65 C to +275 C
LVR05R2200FE12 Vishay/Dale | Mouser

Stock 5% versus 1%
Stock 400PPM/C versus 90 PPM/C
Stock -55 C to +155 C versus -65 C to +250 C

Do you think it's an upgrade? Or maybe i can find some even better.
I need 8 overall (4 for each speaker).

Last edited by ArtemisCables; 3rd May 2013 at 09:02 PM.
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Old 5th May 2013, 01:24 AM   #15
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I would like to thank everyone for their help.

I've decided to go with the Vishay/Mills MRA-Series Resistor.
Either MRA-10R2200FE12 or MRA-05R2200FE12

• Wirewound, Non-magnetic and all welded constructions
greatly enhance frequency response.
Combined with non-inductive Ayrton-Perry
winding the inductive reactance and signal loss
are almost totally eliminated.
Ideal for Audio Industry
• High temperature coating (> 350 C)

A little confused whether or not the MRA-05 is enough since it shows power rating of 4W and 5W. 4W being too low, so i was looking at the MRA-10 which does 7W.

Emailed Vishay, but still haven't received a response.
If i can get one sooner from people who know, that would be great.

Here is the datasheet:
http://www.vishay.com/docs/31801/mra.pdf
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Old 5th May 2013, 01:45 AM   #16
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The power rating is more than adequate in this application--the resistor won't get that hot in normal use. Just space the resistor off the board by about half an inch for heat dissipation.

I doubt you'll hear a difference given that are more critical parts in the circuit, but let us know what you think. Certainly not worth the price of Dueland or other boutique parts.
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Old 5th May 2013, 03:38 AM   #17
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Ah, thanks so much.
Now i finally understand why some resistors are mounted off the by pcb a little.

I'll just grab the MRA and hope for the best. Getting the Dueland would most likely be a waste of money and end up costing more than the speaker itself.

Thanks for your help!
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Old 7th May 2013, 03:20 AM   #18
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With their strong negative temperature coefficient, the Duelands would have been terribly wrong for application as emitter resistors.
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Old 7th May 2013, 05:13 AM   #19
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Ah, so going for a low temperature coefficient is ideal, but when it hits the negatives, things get bad?

I'm currently looking to replace some four WIMA MKP-4's with some Axial Capacitors.

This tread is really helpful: Humble Homemade Hifi

Isn't it ideal to have capacitors as low tolerance as possible as they're in the audio signal? Yet i see so many 5% and 10% getting high scores in the review.

I could understand why bypass caps and electrolytes doesn't need close tolerance as they're only for soothing and filling, but what about one that's actually coupling the signal?
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Old 7th May 2013, 05:17 PM   #20
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Thermal runaway, even with MOSFETs, could be possible with a negative coefficient in this application. It's just the wrong thing to do.

Only filter circuits with precisely defined slopes truly benefit from close tolerance capacitors; what counts in most cases is the quality of the dielectric and the construction. Low internal inductance (all components, including wire, have resistance, inductance and capacitance no matter what their primary function is). It's not a bad thing to match pairs, though.

Can't see any good reason to replace the MKP-4 caps. You're just spending extra money; the hi-fi boutiques just love that! It's your nickel.
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