jh4db536
500+ Head-Fier
- Joined
- Sep 22, 2007
- Posts
- 553
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- 73
been working late it my weekends and massive overtime so i havent been able to think about my project much.
i decided that i am gonna do it right. 2 box it is and im going to attempt a similar layout, umbilical as my RSA apache. f--- the budget; i am working enough overtime these days anyway
um i guess i am officially deeply biased into class A. at .0752V on the mosfets i cannot hold my finger on the heatsinks for more than 3 seconds. i thought i had a pretty good tolerance for pain. i might go back down to like 135ma quiescent current to spare my single O22 the abuse.
all boards zeroed out to no DC offset.
the advice i can offer to anyone building these things is do not screw up on the Q1 to Q4 because you WILL be sorry. i think 1% match on the QUAD is necessary to be safe. q1=q2 and q3=q4 is gambling. toss the outliers and buy more to find a better match seriously.
i think matching the mosfet quad is important too if you want to biase a more aggressively. i can tell that the outliers run at much different temps than the ones that were well matched.
i decided that i am gonna do it right. 2 box it is and im going to attempt a similar layout, umbilical as my RSA apache. f--- the budget; i am working enough overtime these days anyway


um i guess i am officially deeply biased into class A. at .0752V on the mosfets i cannot hold my finger on the heatsinks for more than 3 seconds. i thought i had a pretty good tolerance for pain. i might go back down to like 135ma quiescent current to spare my single O22 the abuse.
all boards zeroed out to no DC offset.
the advice i can offer to anyone building these things is do not screw up on the Q1 to Q4 because you WILL be sorry. i think 1% match on the QUAD is necessary to be safe. q1=q2 and q3=q4 is gambling. toss the outliers and buy more to find a better match seriously.
i think matching the mosfet quad is important too if you want to biase a more aggressively. i can tell that the outliers run at much different temps than the ones that were well matched.