I'd like to do a head to toe write up on what I've learned.
Problem is I'm just a hobbyist lacking the foundation to really understand what Joe and the group has helped me with.
There were power supply issues I couldn't solve to my satisfaction with a onboard transformer, so I recently went offboard with a Power-One Linear Supply.
Also, only in the last week did I get the stepped balance attenuator installed. And, that made a absolutely huge improvement in imaging between the channels.
And yet, I'm not satisfied with the 0.25 dB steps, after testing I want 0.5 dB steps. So I need to build two more, one for the system and another for the test unit. Very labor intensive.
So, it's a work in progress.
Once it's taken as far as possible I'll try to do a writeup.
Any questions, ask and we'll try to answer.
One thing I recently discovered is the issue with the Ambience always in circuit regardless of the switch setting. A stepped attenuator to replace that Ambience pot will fix the issue.
So that's another two attenuators to build and test.