On Thu, Feb 20, 2025 at 07:36 AM, Jerry Lee Marcel wrote:
Now this design is weird from the start. Choosing to power a tube circuit from 24VDC is a major flaw, unless the goal is to create distortion.
I'm not an expert. However I believe the LM317 in "current source" configuration actually fulfills two functions. First it is employed to bias the source of the IRF510 mosfet in common drain (aka source follower) configuration. Second such a constant current is employed to drive the 12AU7 triode heater.
Carlo