heat problem or not ??

arold19 · 27th April 2004, 01:03 AM

Hello, I think I've got a problem with my amplifier! Even my heatsink is very big, my zen V4 is very hot. Afer 3 hour, it is very hot near the mosfet but is cooler at the extremity of the heatsink! Near the mosfet, it is hot for my hand but at the extremity, it is OK. I have the Zen V4 since a years witout problem but sometime, I'm affrait of the high temperature !

The bias is the normal one...

Thank you very much !!!

till · 27th April 2004, 01:05 AM

This tells nothing. Could you please tell exact values in Â°C ? I have some FETs running since month at ~ 80Â°C on the heatsink without failure.

arold19 · 27th April 2004, 01:08 AM

Sorry, I don't have the kind of equipment to take the temps of the amplifier ! What I can do to know more about the risk to operate like that ?
thank

till · 27th April 2004, 01:15 AM

they did not invent the thermometer in your country until now?

wait and see if it will fail, and enjoy the music.

arold19 · 27th April 2004, 01:33 AM

Je n'ais jamais pensé que je pouvais prendre la température avec un simple thermomètre de maison convensionnel ! Je croyais que je devais me procurer un thermomètre spéciale pour pouvoir capter la température d'une pièce de métal !

Merci !

till · 27th April 2004, 01:37 AM

sorry to answer not in your language, surely a special contact thermometer would give a better result, but we are not interested in fractions of a degree, only if it is more like 55°C or more like 95°C.

If you want a good measurement put the thermometer at a place deep between the heatsinks fins near to the FETs position and wait some minutes.

arold19 · 27th April 2004, 01:58 AM

Thank you very much ! I will buy one this week.

Thank you !

GRollins · 27th April 2004, 03:25 AM

An ordinary digital kitchen thermometer will do an excellent job--and you can use it to cook with when you're done. The ones I have read down to tenths of a degree (F or C, your choice, there's a switch on the back), which is more than accurate enough. As till says, you're looking for general trends, not NASA-spec readouts.
Just shooting from the hip, I'd say that those heatsinks look to be good for 50-100W of heat. I'm having trouble telling the scale, though.
How hot is too hot? Nelson routinely runs things a lot hotter than I do. He is content if he doesn't smell burning flesh when he touches a heatsink. I prefer to be able to leave my hand on the heatsink indefinitely. This translates to a fair difference in actual heat dissipation capability.
If the temperature turns out to be higher than you want, you can always go with forced air cooling.
Incidentally, regardless of the heat involved, that's a tidy-looking amplifier.

Grey

Alain Dupont · 27th April 2004, 01:01 PM

arold19,

I live in Lasalle, and I own a thermocouple with my multimeter, I can give you a hand to make the temp measures.

Email me : aldupon@sympatico.ca
Phone: 514-937 1166
Home: 514-365 3790

Regards.

Alain.

arold19 · 1st May 2004, 12:27 AM

I mesure the temp with a thermocouple today an I got the highest temp at about 56.5 degre !

This is normal or a little bit more higher than normally ?

thanks !

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27th April 2004, 01:05 AM	#2
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	This tells nothing. Could you please tell exact values in Â°C ? I have some FETs running since month at ~ 80Â°C on the heatsink without failure.

27th April 2004, 01:08 AM	#3
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Sorry, I don't have the kind of equipment to take the temps of the amplifier ! What I can do to know more about the risk to operate like that ? thank

27th April 2004, 01:15 AM	#4
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	they did not invent the thermometer in your country until now? wait and see if it will fail, and enjoy the music.

27th April 2004, 01:33 AM	#5
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Je n'ais jamais pensé que je pouvais prendre la température avec un simple thermomètre de maison convensionnel ! Je croyais que je devais me procurer un thermomètre spéciale pour pouvoir capter la température d'une pièce de métal ! Merci !

27th April 2004, 01:37 AM	#6
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	sorry to answer not in your language, surely a special contact thermometer would give a better result, but we are not interested in fractions of a degree, only if it is more like 55°C or more like 95°C. If you want a good measurement put the thermometer at a place deep between the heatsinks fins near to the FETs position and wait some minutes.

27th April 2004, 01:58 AM	#7
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	Thank you very much ! I will buy one this week. Thank you !

27th April 2004, 03:25 AM	#8
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	An ordinary digital kitchen thermometer will do an excellent job--and you can use it to cook with when you're done. The ones I have read down to tenths of a degree (F or C, your choice, there's a switch on the back), which is more than accurate enough. As till says, you're looking for general trends, not NASA-spec readouts. Just shooting from the hip, I'd say that those heatsinks look to be good for 50-100W of heat. I'm having trouble telling the scale, though. How hot is too hot? Nelson routinely runs things a lot hotter than I do. He is content if he doesn't smell burning flesh when he touches a heatsink. I prefer to be able to leave my hand on the heatsink indefinitely. This translates to a fair difference in actual heat dissipation capability. If the temperature turns out to be higher than you want, you can always go with forced air cooling. Incidentally, regardless of the heat involved, that's a tidy-looking amplifier. Grey

1st May 2004, 12:27 AM	#10
arold19 diyAudio Member Join Date: Nov 2002 Location: montreal	I mesure the temp with a thermocouple today an I got the highest temp at about 56.5 degre ! This is normal or a little bit more higher than normally ? thanks !

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