Over my head,but for others who might be interested:https://www.electronicsweekly.com/blogs/engineer-in-wonderland/everything-ever-wanted-know-valve-guitar-amplifiers-2020-04/?eea=dDNlazhCQ2FXQ0lwa2h6dW5lYjNTT3g0emMrVDZ5S051WDhIcDAvZ20vaz0=&n_hash=1221&utm_source=e-shot&utm_medium=email&utm_campaign=EW-5903-(Edi)WeeklyNewsletter-%231221
