Just so I’m clear here – am I right in saying that the brass plate grounding described in the DH book ties together:
1) the pots
2) input jack
3) cathode bias resistor
4) filter cap negatives
5) 220kohm resistor

And this brass plate grounds these items to the chassis by the fact that it’s bolted between the pots, jack, and chassis. And the chassis is therefore used as the conveyance to connect these all back to the main grounding terminal strip?

And, it would therefore be in theory better to either individually run each of these 5 items to the main grounding terminal strip, or at least run the filter cap negatives/220kohm resistor to a lug on the strip, and connect up the pots and input with a bus wire and then directly wire them up to the main grounding strip?