People aren't born with an innate ability to design circuitry (I sure wasn't)... many people learned how from the classic old tube manuals ARRL (ham radio) handbook etc. (not me I'm not a tube guy). Many old commercial designs can be traced back to the even older tube manuals.
App notes are the modern tube manuals... I read the national audio app handbook from cover to cover back in the '70s, and only recently gave my dog eared copy to another guy who promised it a good home.
JR
App notes are the modern tube manuals... I read the national audio app handbook from cover to cover back in the '70s, and only recently gave my dog eared copy to another guy who promised it a good home.
JR