[Radio Wrangler]

For a decent current 14v supply it is worth reading the PW 'Marchwood' article. The design is reasonably thorough and well explained in the text.

Just be cautious with 2N3055. Their spec is so wide that the type is a dumping ground for failures of much fruitier devices so you can often see dramatically higher gain or Ft in parts bought cheaply. There are also out and out fakes with tiny die inside which could never do the 2N3055 current and power specifications.

David