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Old 22nd November 2020, 12:07 AM   #91
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Not as far as I know but I've never needed to remove them for any testing.

If I had to keep them from overheating, I used something like the temporary heatsink in the photo below.
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Old 22nd November 2020, 03:12 AM   #92
caraudioguy2100 is offline caraudioguy2100
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Ok here is what I get for drive signal they locations are loaded with a 1000pf cap

First pic is Q1
2nd:Q2
3rd:Q7
4th:Q8


Scope is set up in differential mode
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 22nd November 2020, 05:49 AM   #93
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Do you get the same for Q63 and Q69 as you do for Q2 and Q8?
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Old 22nd November 2020, 06:02 AM   #94
caraudioguy2100 is offline caraudioguy2100
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Yes
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 22nd November 2020, 06:07 AM   #95
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Are both channels of your scope set precisely the same?
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Old 22nd November 2020, 06:08 AM   #96
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Yes
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 22nd November 2020, 06:16 AM   #97
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
If all 4 of the high-side drives (unloaded) look like the low-side drives (the ones with higher amplitude), I'd think that they are OK. There's no way that you could have 4 drive circuits from 2 different ICs that have failed in precisely the same way.
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Old 22nd November 2020, 07:52 AM   #98
caraudioguy2100 is offline caraudioguy2100
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Put all the fets back in circuit along with the rectifiers and regulators .

I powered the amp up for a couple of secs out of the sink and tested for output everything seems fine right now .

Iím gonna put it back in the heatsink and fully tested it .

I will let you know how it goes
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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Old 22nd November 2020, 06:35 PM   #99
caraudioguy2100 is offline caraudioguy2100
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Join Date: Aug 2010
Amp is finally done .

So wanna say thanks a ton for the help with this amp .

I appreciate your help a lot !!
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Multimeter:Klein Tools MM6000 Hakko FX-888D soldering station Hakko FR-300 desoldering gun dual channel oscilloscope 2 ohm 100 watt resistor Pyramid 40 amp power supply and a kenwood KDC-248U fornsiganl source . M02020 Testoscillator
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