Ohmite Audio Gold

[hawkfeather]

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

 

[pinkmouse]

Have you asked Ohmite for a list of their distributors?

 

[testlab]

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]

application

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

 

[testlab]

Have a look at these. I use them myself.

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

 

[BrianL]

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

 

[hawkfeather]

Caddock

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

 

[grataku]

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]

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]

Re: Caddock

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

 

[hawkfeather]

Yes he did!

Hey Steve,

Mark got back to me and now I'm just waiting for a total and payment instructions from him... I'm gonna go with those ones in my design. Thanks again! I think I'll use a Caddock in a 15W, TO-126 heatsinked for my power supply output though.

Hawk

 

[Steve Eddy]

Re: Yes he did!

Mark got back to me and now I'm just waiting for a total and payment instructions from him... I'm gonna go with those ones in my design. Thanks again!

You're quite welcome. Hope they work as well for you as they have for us.

I think I'll use a Caddock in a 15W, TO-126 heatsinked for my power supply output though.

Yeah, the Caddocks are a nice resistor if you've an opportunity to heatsink 'em.

Good luck with your project!

se