Non-Power Supply Ground Wires

[Magnatron]

I know it's a good idea to keep power and AC grounds away from the rest of the circuit grounds -- particularly the power transformer -- but should circuit ground wires be kept also away from any other transformer such as OT or reverb?

[maxkracht]

In general, I wouldn't worry about the physical location of ground wires in relation to other wires and components, just where they are actually connected.

[Stevem]

One main thing to start with is with the secondary center tap off the PT.

This ground wire needs to right to the first power supply filter and then a wire is run from there to a post on the chassis where all other combined main grounds go to.

Meaning like all the combined grounds from the preamp section .
The Pi should get its own separate ground wire off of its filter node.

[ViperDoc]

See the Star Grounding post in the FAQ section.

[WhopperPlate]

Concerning ground wire lead dress https://ampgarage.com/forum/viewtopic.php?f=19&t=36507