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Old 25th February 2012, 05:00 PM   #4411
Gyuri is offline Gyuri  Hungary
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Hm, I have an off topic question:
What could be the dye temperature of my FETs, in my four-channel F4 amplifier?
And how long lasting my semiconductors?
Some technical data:
The four channel amp draw 5A/230V, according to my Schuntermann.
https://public.bay.livefilestore.com...big.jpg?psid=1
At actual setting I measure ~0.6V at 0.47 ohm source resistors. So it is ~1.28A/device, at 30.5V source/drain voltage.
(I use two 1KVA toroid, which I gathered from my friend Sajti. They have 2x25V secondary voltages, among others.)
https://skydrive.live.com/?sc=photos...1500&sc=photos
So they dissipate ~40W/device.
It is total 4x6x40 watt, it is 960W, it is might correlate to Schuntermann measure, see above.
The heatsink temperature ~70 C, at 20 C room temperature.
That's right, this yet my fakir fingers I do not tap it with pleasure.
What there may be the dye temperatures?
I use mica and goop, of course.
Till when may the FETs endure this?
Motto:?
The good sounding electrons are the hot electrons, it doesn`t matter, where are they came:
tube or semiconductor.
I apologise for my engrish as always, it`s came out straight my brain, without Google.

Wacky Gyuri
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Old 25th February 2012, 05:16 PM   #4412
Zen Mod is offline Zen Mod  Serbia
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well - without going in too much of calculus in saturday evening , let's say that mosfet dyes are having at least 25C more than is wise to have .

why not using something as Papa's Koan Babysitter , or fan on each heatsink ?

Lazy Susan style - 12V Noctua , as recently discovered by Dutchiewhale , are old and well known story .

regarding some Qs in previous post of you - snow is going down , my ill back are better and I'm also using Spiritus for usual Gusztav stuff (cleanin' da button ... and everything else )

your Engrish is much better without Google Drekloader
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Last edited by Zen Mod; 25th February 2012 at 05:24 PM.
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Old 25th February 2012, 05:19 PM   #4413
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and yes - I don't want picture of Nude Finger Bone ;

except in duo with untouched middle one

wakoo Canuck
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Old 25th February 2012, 05:20 PM   #4414
Gyuri is offline Gyuri  Hungary
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More than needed or more than tolerated, that is the question.
To be or not to be.
It is the most relevant question.
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Old 25th February 2012, 05:23 PM   #4415
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that part edited for your liking

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Old 25th February 2012, 05:27 PM   #4416
Gyuri is offline Gyuri  Hungary
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I`m happy with it.

Yes, and I do not finger this.
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Old 25th February 2012, 05:29 PM   #4417
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Quote:
Originally Posted by Zen Mod View Post
and yes - I don't want picture of Nude Finger Bone ;

except in duo with untouched middle one

wakoo Canuck
Jacco added the last line to his post after I had asked for pictures so it looks like I wanted to see pictures of his finger. No thanks, I was asking for pics of Spain when he is away.

Just saying...
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Old 25th February 2012, 05:34 PM   #4418
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I know for that editing moment , but couldn't resist ;

just to keep up in front of wakoo Canucks ....... moi renommee is here on stake
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Old 25th February 2012, 05:35 PM   #4419
Gyuri is offline Gyuri  Hungary
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more than is wise to have .

So you edited your posts, right?

Anyway, who said that I am wise?
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Old 25th February 2012, 05:42 PM   #4420
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Quote:
Originally Posted by Gyuri View Post
So you edited your posts, right?
yup , and I wrote you so

Quote:
Originally Posted by Gyuri View Post

Anyway, who said that I am wise?
well - I'm not going to be the first one to throw that stone on ya ....

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