F2 running hot(how hot is hot?)

Aron · 11th February 2009, 03:38 PM

Hi,
i just got my hands on a F2 clone. It gets very hot, mutch hotter than my old A-40(mutch bigger sinks). I can put my hand on the top-plate for maybe 20 seconds before it gets too hot.
Is this too hot?
I tried to search the forum but did not find an answer that cooled me down.
Where should i measure the heat and what temperature is "safe"
I am a newbie in ss classA.
Thanks
Aron

Zen Mod · 11th February 2009, 04:11 PM

Quote:

Originally posted by Aron
Hi,
i just got my hands on a F2 clone. It gets very hot, mutch hotter than my old A-40(mutch bigger sinks). I can put my hand on the top-plate for maybe 20 seconds before it gets too hot.
Is this too hot?
I tried to search the forum but did not find an answer that cooled me down.
Where should i measure the heat and what temperature is "safe"
I am a newbie in ss classA.
Thanks
Aron

Papa use to say - skin is your best meter

if you can rest your palm on hsink for 5 secs , everything is OK ;

then temp is around 50-55C

Gyuri · 11th February 2009, 04:46 PM

Yes, and what the situation if somebody is a fakir, than I?
This method does not work reliably in this case.
Gyuri

hifimaker · 11th February 2009, 05:27 PM

The test Zen Mod mentions works well. I also have a friends perform the same test when they came over to listen. Group consensus is the shortest duration was 6 seconds and the longest was 12 seconds after 2 hours of use. Averaging nearly a dozen "hand tests" came to 7 seconds.

Over three years and my A30 is still running strong.

-David

Tea-Bag · 11th February 2009, 05:37 PM

lets see a pic of the sinks.

this sucker produces a lot of heat. I use 2 12" X 6" per channel. One sink per FET. The power resistors inside can roast a small cornish hen.

If it runs a little too hot, you may be able to put some CPU sinks on the inside and bond them (permanenty) using thermal epoxy.

hifimaker · 11th February 2009, 06:05 PM

If you can place your hand on the top of the heat sink after 1 hour, then 2, then 3 hours and you and your friends can touch it for more than 5 seconds - you should be within range.

As Tea-Bag suggested, post a picture of the heat sink if you still have questions.

BTW, I believe these power mosfets need to run hot to perform best. It is possible to over heat sink as well.

-David

Aron · 11th February 2009, 07:18 PM

Quote:

Originally posted by Zen Mod

Papa use to say - skin is your best meter

if you can rest your palm on hsink for 5 secs , everything is OK ;

then temp is around 50-55C

Hi!
I removed my hands after 10sec and could hold it longer. I am a chef and are used to burning my hands. I guess the amp is in the safe zone. I´ll roast a friend and see how long he can hold it. Will post back with pictures if it fails the test.
Thanks everyone responding to my question.
Aron

twitchie · 12th February 2009, 03:11 AM

My F2 measures 53C and it feels hot enough that you really don't want to keep your hand on it longer than 2 or 3 seconds

, but you don't want to look like a wimp, so you hang on for about 5 and cry about it when nobody's looking

but it's those 1 ohm resistors you really need to stay away from - I measured those as high as 83C

who would be foolish enough to stick their hands in a running amp you say? Why the fool who needs to adjust it after it warms up, that's who

Babowana · 12th February 2009, 04:17 AM

Don't you remember this?

Scribble · 13th February 2009, 11:30 AM

I find its good to measure the packages them selves to see if they are about the same. On a channel of my Aleph 30 i had one device which was not torqued down enough and was running HOT HOT. Only picked it up with an infra-red thermometer. A quick nip up and it was running within a few degree's of the others.

11th February 2009, 03:38 PM	#1
Aron diyAudio Member Join Date: Feb 2009	F2 running hot(how hot is hot?) Hi, i just got my hands on a F2 clone. It gets very hot, mutch hotter than my old A-40(mutch bigger sinks). I can put my hand on the top-plate for maybe 20 seconds before it gets too hot. Is this too hot? I tried to search the forum but did not find an answer that cooled me down. Where should i measure the heat and what temperature is "safe" I am a newbie in ss classA. Thanks Aron

11th February 2009, 04:46 PM	#3
Gyuri diyAudio Member Join Date: Nov 2003 Location: Budapest	Yes, and what the situation if somebody is a fakir, than I? This method does not work reliably in this case. Gyuri __________________ Those who would have deserved the life they are all dead already. "Oh, my dead dears!" - Captain Cat

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11th February 2009, 05:27 PM	#4
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	The test Zen Mod mentions works well. I also have a friends perform the same test when they came over to listen. Group consensus is the shortest duration was 6 seconds and the longest was 12 seconds after 2 hours of use. Averaging nearly a dozen "hand tests" came to 7 seconds. Over three years and my A30 is still running strong. -David

11th February 2009, 05:37 PM	#5
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	lets see a pic of the sinks. this sucker produces a lot of heat. I use 2 12" X 6" per channel. One sink per FET. The power resistors inside can roast a small cornish hen. If it runs a little too hot, you may be able to put some CPU sinks on the inside and bond them (permanenty) using thermal epoxy.

11th February 2009, 06:05 PM	#6
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	If you can place your hand on the top of the heat sink after 1 hour, then 2, then 3 hours and you and your friends can touch it for more than 5 seconds - you should be within range. As Tea-Bag suggested, post a picture of the heat sink if you still have questions. BTW, I believe these power mosfets need to run hot to perform best. It is possible to over heat sink as well. -David

12th February 2009, 03:11 AM	#8
twitchie diyAudio Member Join Date: Jul 2004 Location: Toronto, Canada	My F2 measures 53C and it feels hot enough that you really don't want to keep your hand on it longer than 2 or 3 seconds , but you don't want to look like a wimp, so you hang on for about 5 and cry about it when nobody's looking but it's those 1 ohm resistors you really need to stay away from - I measured those as high as 83C who would be foolish enough to stick their hands in a running amp you say? Why the fool who needs to adjust it after it warms up, that's who

13th February 2009, 11:30 AM	#10
Scribble diyAudio Member Join Date: Dec 2002 Location: Western Australia	I find its good to measure the packages them selves to see if they are about the same. On a channel of my Aleph 30 i had one device which was not torqued down enough and was running HOT HOT. Only picked it up with an infra-red thermometer. A quick nip up and it was running within a few degree's of the others.

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