Ohmite Audio Gold

hawkfeather · 3rd February 2006, 01:33 PM

Anyone know if Ohmite Audio Gold non-inductive resistors are available at retail anywhere? How much they cost?

pinkmouse · 4th February 2006, 08:44 AM

Have you asked Ohmite for a list of their distributors?

testlab · 5th February 2006, 12:02 AM

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?

hawkfeather · 5th February 2006, 01:04 PM

My application is for the emitter resistors for a 100W amp I'm designing. They will need to be .2 Ohms, non-inductive.

testlab · 5th February 2006, 03:07 PM

Have a look at these. I use them myself.

http://www.mouser.com/catalog/625/492.pdf

BrianL · 6th February 2006, 03:01 PM

Look at Caddock. They have several types of resistors that will work

hawkfeather · 6th February 2006, 06:29 PM

The lowest wattage they show in the Mouser page is 15W TO-126 package. Would that be too much or does it matter?

grataku · 6th February 2006, 06:48 PM

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.

Steve Eddy · 6th February 2006, 08:22 PM

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

se

Steve Eddy · 6th February 2006, 08:24 PM

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?

se

3rd February 2006, 01:33 PM	#1
hawkfeather diyAudio Member Join Date: Dec 2005 Location: PA	Ohmite Audio Gold Anyone know if Ohmite Audio Gold non-inductive resistors are available at retail anywhere? How much they cost? __________________ Is it not better to burn out, than to fade away?

4th February 2006, 08:44 AM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Have you asked Ohmite for a list of their distributors? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

5th February 2006, 12:02 AM	#3
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	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? __________________ It's not whether you win or lose, it's how you lay the blame.

5th February 2006, 01:04 PM	#4
hawkfeather diyAudio Member Join Date: Dec 2005 Location: PA	application My application is for the emitter resistors for a 100W amp I'm designing. They will need to be .2 Ohms, non-inductive. __________________ Is it not better to burn out, than to fade away?

5th February 2006, 03:07 PM	#5
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	Have a look at these. I use them myself. http://www.mouser.com/catalog/625/492.pdf __________________ It's not whether you win or lose, it's how you lay the blame.


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6th February 2006, 03:01 PM	#6
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	Look at Caddock. They have several types of resistors that will work __________________ bel

6th February 2006, 06:29 PM	#7
hawkfeather diyAudio Member Join Date: Dec 2005 Location: PA	Caddock The lowest wattage they show in the Mouser page is 15W TO-126 package. Would that be too much or does it matter? __________________ Is it not better to burn out, than to fade away?

6th February 2006, 06:48 PM	#8
grataku diyAudio Member Join Date: Dec 2000 Location: -	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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