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12th October 2010, 05:03 PM
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#1 |
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diyAudio Member
Join Date: Oct 2010
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FET10e Channel Noise
Hello all! New user looking for assistance troubleshooting a fet10e. Recently right channel began "making noise". Narrowed down with O-scope to sinusiodal inputs resulting in 1/2 wave rectified output. Further checking, it appears the output transistors Q8, Q9 are not biased on (comp1 voltage is ~0.4v, while on good channel it is around 0.88v). I suspect component hfe drift, possbily requiring adjustment of pot or component replacement.
Anyone have any suggestions? Thx. |
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12th October 2010, 06:54 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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Q8 and Q9 ?
on which schematic ? this one ?
__________________
my Papa is smarter than your Nelson ! tnx to  clean  thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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12th October 2010, 10:23 PM
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#3 |
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diyAudio Member
Join Date: Oct 2010
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FET10e Channel Noise
Yes, thats the one! S5541098.
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12th October 2010, 10:48 PM
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#4 |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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can you use that pic and write measured voltages in few critical places
the more the merrier
__________________
my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb
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13th October 2010, 11:32 PM
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#5 |
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diyAudio Member
Join Date: Oct 2010
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Troubleshoot FET10e
OK, much easier for me to make a little spreadsheet. See if you see what I am thinking - Q7...
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