A simple modification to the stock N5X circuit is to add heater elevation. The idea is to reduce a small amount of 50/100Hz hum I was hearing with the power control above 5.
Tristan is an engineer with first-hand knowledge of marketing & business strategy, experience of delivery, and deep technical capabilities. More importantly, he knows how a business makes money and revels in translating complexity into something workable. He is interested in high-growth, high-margin opportunities where there is tangible IP or skills to be developed.