This is the first layout I've designed by myself. It's inspired by Matamp layouts.
I'm not sure if the distance between tubes and between tubes and transformers is enough. What do you think? There is also a choke between preamp and power tubes.
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There should be holes in the boards for underboard wires etc.. I just don't know how to properly draw it with DIYLC. Some of the wires should be also shielded or 2-conductor.