:) Thank you for the encouragement. That's good information to know. I've got a hand wired prototype, and it seems to work ok, so my PCB is going to be similar.
That's one nice about (tube) guitar amplifiers: max current is at the power supply pin, about 72ma, despite transferring 27w or so. So your voltages are pretty high , but your traces can be pretty thin. The big thing is leaving plenty of space to prevent arcs.
You also need to allow for failure conditions. If a power tube fails as a short or low impedance, which will vaporise first: your thin tracks, or your fuse?
That's one nice about (tube) guitar amplifiers: max current is at the power supply pin, about 72ma, despite transferring 27w or so. So your voltages are pretty high , but your traces can be pretty thin. The big thing is leaving plenty of space to prevent arcs.