This PCB is designed to make prototyping B9A tube stages very easy, while turning out a good looking and functional result. This is accomplished with a carefully designed series of pad/via interconnects on the bottom side of the PCB that make component interconnection easy, and largely or completely wire jumper free (see diagram below.)
Because 9-pin B9A tubes often have more than one tube unit internally, there is a "ground spider" designed into the layout that will help reduce crosstalk between tube pins when grounded. To use it, simply connect any one of the spider layout's vias to a ground source.
The eight edge connections naturally accommodate two AC lines for the tube filament, B+, ground, and one to four additional connections.
This PCB requires the following tube socket:Paid link(s) from Amazon:
Optional: If you'd like to use edge connectors, these are the ones the PCB is designed to accept:Paid link(s) from Amazon:
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