even though it says 230 V on it after rectification, I am getting 317 V at the tube
Transformers are rated by RMS AC output. A standard rectifier into large capacitors will have close to the peak voltage, not the RMS voltage, so approximately 1.4x the RMS rating. A 230V labeled transformer secondary would be expected to be around 320V-325V at the first filter cap.
If that first filter cap is rated for 350V as shown in the Gyraf schematics it is a little under-rated. Traditionally you would design for +10% line voltage over nominal, so design for at least 357V, and then derate from there for increased reliability and lifespan. Not a short term concern to get your build working, just something to note for the future.
by independently I mean there are 3 ground wires coming from each srpp board ground point and going to star ground. There are a 2 ground points on each filter board both with their own wire going to star ground. So that makes 10 wires going to star ground total.
That makes no sense electrically and is asking for problems. It
might not cause problems, but it makes a big physical mess and makes problems harder to troubleshoot, so why do it?
That schematic really encourages wiring in a pin 1 problem and is guaranteed to be noisy with at least some equipment you connect to the input and output.
I hope Gyraf has learned better in the intervening 20 years.
It also is a little incomplete, because it does not show the interconnection points between the different PCBs. Or was the original Gyraf design all on one large PCB? These PCBs are apparently from DIY-Racked, but DR no longer makes that project, so hard to tell.
Might as well also try this rectifier board I built to see what happens if the long crossing power rail is no longer carrying AC
You only have a rectifier, no capacitors. I guess that technically is not AC, but it also isn't what most people would call DC. You are going to have full wave rectified pulses on the wiring between rectifier board that you built and the power supply board. If you just move the transformer outside the chassis you will have sinusoidal-ish voltage on the wires, but full wave rectified current pulses, which isn't much of a difference if you twist the wire pair and have enough physical separation that you don't get any capacitive coupling to speak of.
In other words any benefit would be primarily because of moving the transformer out of the chassis, not because of changing where the rectifiers are located.
The picture you attached still had the transformer bolted into the case, and only the rectifier sitting outside the chassis, and I would not expect that to make any relevant difference. If it does I am not sure what that might imply, probably that the problem is very sensitive to the specific power wire routing path.
You could test that hypothesis by moving the wires into the same location but jumper around the external bridge rectifier.
I am having trouble imagining what problem a different rectifier is trying to address, or why that would even be suggested. The only thing I can think is that there was a misunderstanding and what was proposed was an external power supply, but that is just guessing on my part without seeing the original reference.
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