frusciante89 wrote: ↑Sun Dec 11, 2022 9:50 pm
Don't really understand what you mean bepone. The widths of the traces have been simulated using a PCB software, and I've more than 500 happy customers around the world!
What you mention might be true for 1960s PCBs in which you had bare copper traces exposed. In modern PCB manufacturing, the protection layer on top of the copper avoids the potential arcing you're mentioning. Also, from my experience, this might potentially happen only in high voltage circuitry, but we are talking about signal of the order of kV - definitely not something you see in a tube amp.
If you have an example of a board failing this way, would love to see it! Again, never had an issues like that in my boards in more than 10 years
first of all i'm more than 25 years /design, repair/ in professional electronic pcbs. also i was working on 6kV vessel thruster ABB pcbs (thruster power 4.4MW) where you have more than half meter distance between the lines.
i see that your thinking only goes in one direction, looking only ideal case. also number of customers is not important even if there will be 1.000.000 of them! i see that you didnt even have a look in Marshall DSL TSL pcb , those are modern pcb failures, check here:
https://music-electronics-forum.com/fil ... ?id=859716
https://irationaudio.files.wordpress.co ... g_0232.jpg
https://irationaudio.files.wordpress.co ... g_0249.jpg
your pcbs will be refused in any serious industry, specially in oil and gas or marine. from first overview, you didnt take in account humidity and dust, and also clearance between the Ubb and gnd lines (+-). this means reliability.
i see that you are making some effort, hence my correction .. you can further investigate about Marshall TSL, DSL amps it is full of net of them.
also PCB is becaming porosive and conductive with time , and carbonysing and short circuit can happen after decade or two
carbon.png
my point is that is never too low clearance between the 450V and gnd lines.. and you have only basic, 40 mills, made with auto- pouring (?).. you can draw a circle around those points and auto pour will not reach there. or you can declare voltage on those nods so program will not fill close to that. like this you can reach good 5mm between (200 mills). etc.
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