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Old 23rd March 2012, 02:56 PM   #1
Brycebw is offline Brycebw  United States
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Default Amplifier Dummy Load Nichrome Wire

I Have 54" of 24 guage nichrome wire (8 ohms) to handle up to 80vrms at around 740 watts rms. What would be a good heat resistant material to wrap it around?
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Old 23rd March 2012, 03:34 PM   #2
RJM1 is offline RJM1  United States
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A red house brick, smooth over the edges, but you would still need a fan.

Last edited by RJM1; 23rd March 2012 at 03:36 PM.
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Old 23rd March 2012, 05:43 PM   #3
Brycebw is offline Brycebw  United States
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Quote:
Originally Posted by RJM1 View Post
A red house brick, smooth over the edges, but you would still need a fan.
Okay sounds good.
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Old 23rd March 2012, 06:31 PM   #4
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How about an old pyrex rolling pin .
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Old 23rd March 2012, 07:29 PM   #5
Brycebw is offline Brycebw  United States
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I used the minimum amount of wire for the load, consequently at the dummy load's max wattage, its temperature is much higher than what is required to soften pyrex glass. 2,300F At 1510F Pyrex glass becomes soft .

Last edited by Brycebw; 23rd March 2012 at 07:37 PM.
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Old 23rd March 2012, 09:58 PM   #6
godfrey is online now godfrey  South Africa
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Is water cooling not an option, i.e. putting the whole contraption in a bucket of water?
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Old 23rd March 2012, 10:04 PM   #7
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Yes Godfrey, you´re right - scroll down:

amplifiers vacuum tube systems hi-fi hihighend 6c33c triode SET OTL's

Karsten
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Old 23rd March 2012, 10:18 PM   #8
Ron E is offline Ron E  United States
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Make a loose, cylindrical coil, and put it in a jar of vegetable oil (several liters) with their axes aligned, hopefully convection will take care of the rest, or you might have a fire...

Wrap it around a hollow pyrex cylinder with water flowing through it.

They make this stuff for insulating kilns, wrap it around a tin can and then wrap the wire around that.
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Last edited by Ron E; 23rd March 2012 at 10:22 PM.
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Old 23rd March 2012, 10:22 PM   #9
godfrey is online now godfrey  South Africa
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Quote:
Originally Posted by Karsten Sømand View Post
Yes Godfrey, you´re right - scroll down:

amplifiers vacuum tube systems hi-fi hihighend 6c33c triode SET OTL's

Karsten
Is there no problem with corrosion of the wire?
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Old 23rd March 2012, 11:20 PM   #10
Pingrs is offline Pingrs  United Kingdom
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The windings shouldn't short, so need to be spaced apart and the former should be high temp capable. Wouldn't an old 1 kW "electric fire" ceramic tube do?

Brian.
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