Hello,
my first channel of my Aleph 4 (soon when all is working converted to a Aleph 2) is finished, however...
It plays, It sings etc. It runs great in a 8 ohm resistor at full power etc. But when I feel temperature of the mosfets (IRFP240) some are colder than others. When I measure voltage over the 1.5 ohm resistors, they are different, the colder ones are lower.
I have a difference of about 5.78 V tot 6.01 V in one sixpack and 5.74V to 5.94 in the other sixpack...
I did the 10 second 'Nelson Pass' way of testing the mosfets and they were all within 0.01V ...
I use 221 1% metalfilm and 1.5 ohm 2% 4W metal film resistors.
After about 15 minutes of running the coolelements are about 44 degrees celcius. Not very high! Measured with a thermocouple placed next to one of the mosfets.
Should I worry, and do my matching again? All mosfets were from the same lotcode...
Let me know,
Edwin
my first channel of my Aleph 4 (soon when all is working converted to a Aleph 2) is finished, however...
It plays, It sings etc. It runs great in a 8 ohm resistor at full power etc. But when I feel temperature of the mosfets (IRFP240) some are colder than others. When I measure voltage over the 1.5 ohm resistors, they are different, the colder ones are lower.
I have a difference of about 5.78 V tot 6.01 V in one sixpack and 5.74V to 5.94 in the other sixpack...
I did the 10 second 'Nelson Pass' way of testing the mosfets and they were all within 0.01V ...
I use 221 1% metalfilm and 1.5 ohm 2% 4W metal film resistors.
After about 15 minutes of running the coolelements are about 44 degrees celcius. Not very high! Measured with a thermocouple placed next to one of the mosfets.
Should I worry, and do my matching again? All mosfets were from the same lotcode...
Let me know,
Edwin