New transistors with driver board

[laatsch55]

Where are the positive and negative leads hooked to?

 

[Almost1]

I really need to learn to pay attention to directions. I wired up the driver board wrong on both channels having 2 leads on each side off by one pin, and I blew a rail fuse. Wired everything up correctly, replaced fuse, and bias was able to be set at 380mV on both channels! DC offset is still 0.1mV on left and 0.4mV on right. Sounds killer!

 

[laatsch55]

Hookay then....

 

[Almost1]

Is it normal for Q1 to get hot at idle? Q2 was warn, but nowhere near as hot. I noticed while waiting for it to warm up for bias adjustment.

 

[Gepetto]

Is it normal for Q1 to get hot at idle? Q2 was warn, but nowhere near as hot. I noticed while waiting for it to warm up for bias adjustment.

View attachment Technical Bulletin 2 for PL14_20 PCBA RevE.pdf

 

[Almost1]

Well that certainly explains it!