Covid confinement has at least given me time to get on with projects that have languished in cupboards for a while. The dcb1 is working in balanced mode for the first time this morning and thankfully without any ground hum issues. Still quite a lot to sort out - some tricky metalwork for the volume display/controller and I still need to figure out the best way to get a 5V power supply inside the box (any suggestions? This is only my second build).
https://imgur.com/gallery/EcvOZWf