CL-60 - How hot should they run with A30??? - diyAudio
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Old 24th April 2007, 02:31 AM   #1
batee is offline batee  United States
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Default CL-60 - How hot should they run with A30???

I have an A30 with 24V rails. Transformer is 400VA, 20V + 20V. Input is 120VAC. One CL-60 in series with each of the primary coils. Two bridges - std 35A. Caps are 68mF -> .235Ohm -> 68mF on each rail. This one PS powers two channels of A30 in standard configuration.

Both CL-60s are running at like 300 degrees F after a few minutes of running (measured with my Fluke IR thermometer). This seems excessive. I see no practical way to sink them. They are in physical contact with one another.

Is this normal? Should I parallel more of these things?

Thanks,

Bryan
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Old 24th April 2007, 03:22 AM   #2
RoboMan is offline RoboMan  Hong Kong
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Default Re: CL-60 - How hot should they run with A30???

They are designed to work under high temperature. At higher temperature they present lower resistance. Don't chill them. Parallel is not necessary provided they are not scorched.
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Old 24th April 2007, 04:35 PM   #3
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This is normal. I haven't measured mine in a while, but I know they're at least 100 degrees C. (VERY HOT)!

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Old 24th April 2007, 05:01 PM   #4
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I'm lucky in this 220V wall power area with respect that steady-state temp.


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Old 24th April 2007, 05:45 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi Batee,
what voltage is dropping across each Thermistor?

If it's significant, then consider a relay bypass once the transformer has settled to operational current.
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Old 26th April 2007, 05:24 AM   #6
batee is offline batee  United States
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Can't measure the voltage drop - everything's covered in heatshrink tubing. However based on some of the posts here, I felt safe leaving it running for several hours, and it's working just fine. I can't believe they're designed to run at that temp, but it's working and that's good enough for me.

Thanks!

Bryan
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