I already swapped out the opamps, but I'm not sure which are the opamp power caps and which is the main power filter cap. Anyone with experience?

After playing around with the amp some more, I noticed a couple things. I'm using BD139/BD140   -The 100ohm R11 fixed my hiss issue with lower impedance / high sensitivity headphones (I'm using Grados) -I'm still having issues with the buffer bias, but I figured out what is causing the...

The weird thing is that if I unplug everything, all the measurements seem way off. The amp is working and everything. I get sound (sounds pretty good!).   Wouldn't plugging in a load (headphones) affect the readings across the output resistors though?

What about the source? It seems like the readings across the output resistors go down when the source is plugged in.

When setting the buffer bias, does it matter whether the source and/or the headphones are plugged in? It may be my imagination, but the reading across the output resistors change.

Not sure if anyone's had any experience with this, but has anyone modified the Apheared 47 design, and created a third channel using an op-amp as the ground channel and buffer? Would this work?   The amp would be using 3 dual opamps, 1 TLE2426.

How / where did you guys order these from?

I was debating this myself (SR80i vs SR125i). I ended up picking up a pair of SR80i.  They're supposed to arrive tomorrow. I can't wait I built myself an Apheared 47 and Pimeta clone for these. I see that Grado's hold their value quite well. I'm hope that I'm satisfied with them (these are my...

Has anyone modded an Audigy 2 Value (SB0400) (yes, I know it's a really old card)? Can anyone advise on which caps I should swap out?