Anyone know of a good replacement for the FB31N20’s ?
Also does this amp use both fb31n20’s and 9640’s?
Someone was inside this amp and it has all mismatched outputs in it
Also does this amp use both fb31n20’s and 9640’s?
Someone was inside this amp and it has all mismatched outputs in it
Attachments
Here are the drive signals for the power supply fets .
With all outputs out of circuit the amp still draws excessive current.
I have a 0.1 uf cap connected between gate and source .
Scope settings are 10us 1volt/div
Do these appear ok or is there a drive problem
To the fets ?
With all outputs out of circuit the amp still draws excessive current.
I have a 0.1 uf cap connected between gate and source .
Scope settings are 10us 1volt/div
Do these appear ok or is there a drive problem
To the fets ?
Attachments
First pic is gate pad
2nd pic is of source pad
And the gate resistors measure 22.3 ohms
This is with a 0.1 uf cap between gate and source .
Scope set to 10us 1volts/div
2nd pic is of source pad
And the gate resistors measure 22.3 ohms
This is with a 0.1 uf cap between gate and source .
Scope set to 10us 1volts/div
Attachments
Here is the other bank .
The scope is set to 10us 1volt/div
The probe is set at 1x not 10x
2nd pic is of another bank of fets . This is the bank I’m having the most issues with .
Here is what I get on the scope with 1 fet installed in the bank .
The scope is set to 10us 1volt/div
The probe is set at 1x not 10x
2nd pic is of another bank of fets . This is the bank I’m having the most issues with .
Here is what I get on the scope with 1 fet installed in the bank .
Attachments
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