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Old 11th December 2010, 06:05 PM   #1
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Default Orion 1200 D

Wondering if anyone knows what gate resistors are used in this amp?

When i recieved it they were missing I know the amp use's IRF3205's for the power supply fets but not sure what vlaue gate resistors it takes.


Any help would greatly be appericated
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Old 11th December 2010, 06:17 PM   #2
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22 ohms
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Old 11th December 2010, 06:50 PM   #3
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Thanks,

Next question is there is 1 resistor missing also that connects to the 3rd leg of 1 power supply fet do you know the value on that also?
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Old 11th December 2010, 06:54 PM   #4
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If it connects between the source and the trace that feeds all of the gate resistors, it's a 1k.
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Old 11th December 2010, 08:14 PM   #5
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Ok i replaced the power supply fets,gate resistors, the drivers.

I took out the 3 driver boards in the output section.

Amp still draws excessive current .


Wondering what i check next? since i cant seem to find anything defective
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Old 11th December 2010, 08:53 PM   #6
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With a current limiter in line amp will power up and produce clean audio.

But the problem im having is 4 of the power supply fets get red hot within a sec or 2 .

Wondering what i should check at this point?
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Old 12th December 2010, 01:33 AM   #7
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Does the gate signal look identical for all of the FETs?
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Old 12th December 2010, 02:22 AM   #8
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.5 volts div 10us ??
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Old 12th December 2010, 03:37 AM   #9
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That's a good starting point. Adjust the timebase to get 3-4 complete cycles displayed.
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Old 12th December 2010, 03:55 AM   #10
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Heres what i get off the gate legs for the power supply fets . They all look this way
Attached Images
File Type: jpg Picture 493.JPG (401.0 KB, 49 views)
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