Building a 300B PSE

[MGCRead]

Yes I understand that, it is the various earth/0V lines on the power supply circuit diagram that confused me. They show the earh symbol ( as does the feedback switch ) and I was confused about which "earth" that meant. However studying the layout diagram it is clear that the PSU earth is the 0V signal earth, not the chassis.

None- the-less I have far too many 0V wires going to R24 and it would be neater to link them together on the tag board and take only one cable to R24, so I will re-wire accordingly. Then I hope a photo of the underside might help members spot where I am picking up the hum. At the moment the wiring is too chaotic.

Cheers, Malcolm