3-Knob Tube Driver Build.

[Marcel]

Here's a hand-drawn circuit-diagram that I'm going to be working from while designing a suitable layout of parts on the 8-way Tagboards:

Looks a lot like a Valvecaster circuit with a 4558 drive... maybe as an alternative you could look at the dual tube designs in the linked pdf... also has lots of interesting info to add

https://cdn.instructables.com/ORIG/F...6HIK1FLK5B.pdf