Hi M, The boards I am using are the ones Bas Horneman had done up as a group buy over at DIY. There are some small differences (JB adds some decopling caps, Bas adds a trim pot ect..) but you can take the same hand full of parts and use either with success. JB’s board was not available when I built mine. Are you sure that JB’s board is set up for the 5687? It has that odd pinout, which leaves it off my favorite list. I will try to check later.
If you have not been to the Tube cad site lately, in the last few bolgs there are PDF manuals as well as a big chart of tubes, with recommended cathode resistors and everything. Good stuff…John
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