As long as there are ground wires going from all the ground points to the Star-Grounding system, it's not going to make any difference if the baking tray is covered with PTFE, although the baking tray itself should be at least grounded at the Star-Ground itself so that it can act as a shield.
What I would do is this, drill a hole in the baking tray at some convenient point, a hole for a power transformer mounting-screw would be a good example, then use some sand paper to sand-away the PTFE coating, then work out exactly how many ground wires need to connect to this point (which will form the Star-Ground), then all you need to do is use the same number of solder-tag eyelets to enable each ground wire to connect to the Star-Grounding point, making sure that the mounting screw is long enough.
Using a Star-Grounding system in a Guitar amp is a good way of eliminating earth-loops that can cause hum-noise.
When I get round to building my Lamington Amp I'll demonstrate with some pics how to create a Star-Grounding system, when I do a build diary.
Last edited by DrNomis_44; 18-05-2017 at 12:20 AM.
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