It's been a while since my last post, but I've finally reached the wiring stage. I mounted the power supply components on stripboard, with virtually all of the unneeded traces removed.
I lacked the tools to deal with the 8mm aluminium front panel though, so now the controls are mounted on top of the case, as are the tube sockets.The "drill press"(a drill in a holder) was anything but precise, so it didn't end up looking as neat as I planned it, but I'm fairly pleased for my first time drilling into aluminium.
The boards are all mounted on metal standoffs and isolated by two polyamide washers. The output transformers are just mounted on two of the polyamide washers.
I now have a new set of questions regarding how I best wire this all up. I'm used to dealing with keyboards and usb power, so this if fairly new for me:
- The case is made up out of 6 different pieces of aluminium, 5 of which are anodised. How do I best go about getting a chassis ground hooked up without causing a galvanic corrosion mess?
- Can I hook up the 1uf capacitor on the output transformers directly between pins 2 and 8 on the transformer, basically using pin 8 as the ground point for each channel?
- Could the ground lug/the x-2 RC filter on the line filter be used as the gathering point for the power/signal and chassis grounds, or is the chassis ground point a better option for that?
I went through the article on grounding audio gear, but I've not figured out how to apply that to this specific case yet, so I hope these questions aren't too silly.
- Geoff
