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Old 3rd February 2006, 01:33 PM   #1
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Default Ohmite Audio Gold

Anyone know if Ohmite Audio Gold non-inductive resistors are available at retail anywhere? How much they cost?
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Old 4th February 2006, 08:44 AM   #2
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Have you asked Ohmite for a list of their distributors?
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Old 5th February 2006, 12:02 AM   #3
testlab is offline testlab  United States
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I looked at Ohmite's distributors and no one seems to carry them. If you need non-inductive resistors, there are lots of choices that are available. What is your application?
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Old 5th February 2006, 01:04 PM   #4
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My application is for the emitter resistors for a 100W amp I'm designing. They will need to be .2 Ohms, non-inductive.
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Old 5th February 2006, 03:07 PM   #5
testlab is offline testlab  United States
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Have a look at these. I use them myself.

http://www.mouser.com/catalog/625/492.pdf
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Old 6th February 2006, 03:01 PM   #6
BrianL is offline BrianL  United States
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Look at Caddock. They have several types of resistors that will work
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Old 6th February 2006, 06:29 PM   #7
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The lowest wattage they show in the Mouser page is 15W TO-126 package. Would that be too much or does it matter?
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Old 6th February 2006, 06:48 PM   #8
grataku is offline grataku  United States
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For emitter resistor the wirewound are more robust, Mills RMA-5 are really good 5W non inductive type.
Caddocks: I don't know about the exact model but remember the de-rating curves for film resistors, the 15W may only be valid with a certain heatsink and a certain temperature.
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Old 6th February 2006, 08:22 PM   #9
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Quote:
Originally posted by grataku
Caddocks: I don't know about the exact model but remember the de-rating curves for film resistors, the 15W may only be valid with a certain heatsink and a certain temperature.
Without heatsinks and at 25C, the Caddocks are rated:

MP915: 1.25W
MP916, MP925, MP930: 2.25W
MP2060: 2.5W
MP9100: 3.5W

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Old 6th February 2006, 08:24 PM   #10
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Default Re: Caddock

Quote:
Originally posted by hawkfeather
The lowest wattage they show in the Mouser page is 15W TO-126 package. Would that be too much or does it matter?
You can always use a resistor with a higher power rating. But the power ratings for the Caddocks assume proper heatsinking. See my post above for the power ratings in free air (25C).

If you want to use the Caddocks, it would be best to mount them to the same heatsink you'll be mounting your output devices on.

By the way, has Mark get back to you yet?

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