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In Reply to: RE: Blown resistor posted by sgdouglas@dccnet.com on March 04, 2012 at 20:52:30
47 is 3 less than 50 & 56 is 6 more than 50. 3/50=0.06 or 3 is 6% of 50. Typically such crossover parts themselves have +,-10% deviation per value-as-marked tolerances which means the original resistor may have measured anywhere from 45 ohms to 55 ohms despite its' 50-ohm marking. So replacing a 50-ohm part with a 47-ohm part is not only OK, but within part specification. If only a 56-ohm part were available, even that will be fine but 47 is the slightly better choice of those two.
Edits: 03/05/12 03/05/12 03/05/12Follow Ups:
Understood, as a CPA I get the math, I just wsn't sure if a few ohms would change the signature of the speaker as this resistor is on the midrange crossover board. Many thanks, Scott
Why don't you just put two 100-ohm resistors in parallel and you will have 50-ohms? That's what I would do if I couldn't find a 50-ohm resistor.
Good luck,
John Elison
Just re-read your message, I also need a 100 ohm as well. This may sound like a stupid question but what is the physical difference of soldering the resistors together in series or parallel? What does each way look like? Thank you again
Check out the link below.
Thank you John, I am changing all of the resistors, I actually need a 100, 50, 3 and a few 4's. The old ones are showing signs of aging! Thank you again for your assistance...
The non-inductive resistors that are recommended come in 33 ohms, so 3 of those is 99 ohms which is pretty close to the target. Is it OK to solder 3 together?
Well, I thought the target was 50-ohms. You would need six 33-ohm resistors in series parallel. However, with the internet at your disposal, I would think you could find an acceptable 50-ohm resistor. Check out the following link.
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