My O2 started to make a LOUD turn on transient noise and the following test was failed:
"To verify the MOSFETs were not damaged by static electricity (ESD), and the entire power management circuit is working correctly, with nothing connected to the amp and running only from battery, pull one battery out and check for DC at the output jack as above. It should be less than 0.7 volts (700 mV)"
With the O2 turned ON:
With only bt1 battery connected I get 8.2volts (not mili) DC for the right and left channels respectively.
With only Bt2 battery connected I get 1.2volts (not mili) DC for the right and left channels respectively.
So I sent the amp to the manufacturer and it fixed the amp and said that it replaced the R4,R5,R8,R24 to a "components with quieter transient beheviour".
(I still need to test the turn off transient as it seems loud....)
The resistors were changed from the recommended by NWAVGUY 270KOHMS to 276KOHMS (color codes: red, violet,blue, orange, brown).
SO my questions:
1) Does the "mosfet test" that I made indicate for sure a damaged mosfets?
2) Does the O2's performance degrade as result of the manufacturer stray of the recommended 270KOHMS to R4,R5,R8,R24 (the manufacturer chose 276KOHMS)?
3) Do I need to change back the R4,R5,R8,R24 resistors back to the recomended 270KOHMS ones?
I"m really worried about the manufacturer not following strictly NWAVGUY's design...should I be? Is there a chance in degradation in THD, phase performance, FR, etc??? :(:(:(
"To verify the MOSFETs were not damaged by static electricity (ESD), and the entire power management circuit is working correctly, with nothing connected to the amp and running only from battery, pull one battery out and check for DC at the output jack as above. It should be less than 0.7 volts (700 mV)"
With the O2 turned ON:
With only bt1 battery connected I get 8.2volts (not mili) DC for the right and left channels respectively.
With only Bt2 battery connected I get 1.2volts (not mili) DC for the right and left channels respectively.
So I sent the amp to the manufacturer and it fixed the amp and said that it replaced the R4,R5,R8,R24 to a "components with quieter transient beheviour".
(I still need to test the turn off transient as it seems loud....)
The resistors were changed from the recommended by NWAVGUY 270KOHMS to 276KOHMS (color codes: red, violet,blue, orange, brown).
SO my questions:
1) Does the "mosfet test" that I made indicate for sure a damaged mosfets?
2) Does the O2's performance degrade as result of the manufacturer stray of the recommended 270KOHMS to R4,R5,R8,R24 (the manufacturer chose 276KOHMS)?
3) Do I need to change back the R4,R5,R8,R24 resistors back to the recomended 270KOHMS ones?
I"m really worried about the manufacturer not following strictly NWAVGUY's design...should I be? Is there a chance in degradation in THD, phase performance, FR, etc??? :(:(:(