[__redruM]

Output transistor burned? I just finished building a Millet Max with diamond buffers, and I believe I've burned one or both of my output transistors in one of my channels. Do I just replace QB8 and QB9? Or are other parts possibly damaged?

LQB8 33mv
LQB9 32mv

RQB9 0V
RQB8 12V

Luckilly I have replacement RB8 and RB9.

 

[tomb]

Quote:

Originally Posted by __redruM /img/forum/go_quote.gif Output transistor burned? I just finished building a Millet Max with diamond buffers, and I believe I've burned one or both of my output transistors in one of my channels. Do I just replace RB8 and RB9? Or are other parts possibly damaged? LRB8 33mv LRB9 32mv RRB9 0V RRB8 12V Luckilly I have replacement RB8 and RB9.

Unless you're using MOSFETs, RB8L/R and RB9L/R are supposed to be jumpered out.

Refer to the key differences with BJT diamond buffers here:
http://www.diyforums.org/MAX/MAXbjt.php

So, what did you use for output transistors and do you have a pic or two you can show us?

 

[__redruM]

Sorry,
Q8 and Q9 I meant Q8 and Q9, I'll edit...

 

[tomb]

Quote:

Originally Posted by __redruM /img/forum/go_quote.gif Sorry, Q8 and Q9 I meant Q8 and Q9, I'll edit...

In that case, I agree with you. It looks like the left buffer is fine, assuming you're just beginning to setup the DB bias - 33mV is basically OFF for current biasing. Those readings on the right buffer indicate a big problem - possibly a fried output transistor as you said.

 

[__redruM]

I had a bad soldier joint at RB10. Its dialing in now...

 

[tomb]

Quote:

Originally Posted by __redruM /img/forum/go_quote.gif I had a bad soldier joint at RB10. Its dialing in now...

Glad to hear it was that trivial!