[NelsonVandal]

Posted in DIY-section.
http://www.head-fi.org/forums/showthread.php?t=240891

1. opamp removed and bypassed
2. small caps from output to ground (low pass filter) removed
3. output resistors removed
4. changed output transistors to BD137/138
5. active ground channel, LMH6654, added
6. removed input coupling caps
7. changed input diodes from the dual (BAV99 or something like that) to 1N4148
8. increased bias (bias resistors 1,5k instead of 3k)

Don't try this at home, to much work, sounds good though. Some DC-offset after adding the active ground which I'm going to try to cure. Now there's not room for more tweaks.

Do you think I void my warranty

.

 

[NelsonVandal]

I parallelled the bias resistors on the + rail with 100k, and know the DC-offset is nearly 0. I also did tweaks 7 and 8. The only components left from the original Xtra is the 3,3 Ohm resistors, and I will change them later on.

Now this amp sounds very good. There's just a pinch of coarseness compared to my slightly better amp.

 

[donor]

as a huge fan of this amplifier, and a complete stranger to messing with electronics. Is there anyone I can pay to do these things to my amplifier?