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18th September 2010, 05:04 PM
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#1 |
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diyAudio Member
Join Date: Aug 2008
Location: Roswell GA
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I fried someting on my F5...ugh
So I had the double MOSFET going good this morning on the F5 and when I cranked the volume up I lost the right channel. I quickly turned the amp off and brought it back to the test bench...
Now, R5,6,7,8 get REALLY hot and there is no current going to the MOSFETS. Am I fearing the worst that I lost the JFETS? Also, I am getting about 24VDC on the speaker outputs. What else would be the likely candidate? |
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18th September 2010, 05:36 PM
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#2 |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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do you know how to test jfets and mosfets ?
matching procedure is what you need to test them , and that's easiest way for not experienced DIYas ..... look at FW site for articles - then "mosfet testing" article
__________________
my Papa is smarter than your Nelson ! tnx to  clean  thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb
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19th September 2010, 03:42 PM
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#3 |
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diyAudio Member
Join Date: Aug 2008
Location: Roswell GA
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I verified that the 2sk170 in one channel was bad.
I replaced with a spare and the same thing happened...at lower volumes everything is a-ok...when I cranked it up the 2sk170 blew agian...and passed full DC voltage to the speaker terminal... Could a bad ZTX550 also be causing this? I will explore later but I cant keep losing these JFETS! |
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19th September 2010, 04:18 PM
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#4 |
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The one and only
Join Date: Mar 2001
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Probably not. How is your F5 different from stock?
Is the output DC positive or negative? 
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19th September 2010, 04:23 PM
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#5 |
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diyAudio Member
Join Date: Aug 2008
Location: Roswell GA
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I added another pair of mosfets along with the 47 ohm and 0.47 ohm resistors.
I was running at about 525mA on each of the 4 mosfets... the DC at the speaker terminals is 22.5V positive... I should mention that this happened both with an aikido pre and the jfet boz pre... |
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19th September 2010, 04:24 PM
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#6 |
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diyAudio Member
Join Date: Jun 2006
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What kind of speakers do you play your F5 with? Did you blow your speakers as well?
Wachara C. |
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19th September 2010, 08:23 PM
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#8 |
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diyAudio Member
Join Date: Aug 2008
Location: Roswell GA
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Well...all went well on the test bench in the basement...brought it back upstairs to the listening room and adjusted the bias/offset after about 2 hours of listening downstairs...
hooked everything up, the F5 is now in the aikido...turned the amp on, then turned the aikdio on...and...crackle crackle crackle...lost both CHR-70's.... This really really sucks...bad day... |
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