The CF/EQ/PI PCB can be configured in lots of ways. The first triode is a generic gain stage but the second triode can be configures as a:
Cathodyne phase inverter
What's more, you can implement this with:
Direct coupling with a grid-cathode protection diode!
But wait, there's more! The tone stack can be connected either to the cathode or anode of V1b, or not used at all,
and it can be configured either as:
Traditional FMV tone stack
James tone stack with mid shift! (Described in my book, section 11.10)
The circuit is shown below in some of its possible configurations.
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