| Year | 1921 |
| Date | 29-Sep |
| Volume | 45 |
| Issue | 1,066 |
| Page | 266 |
| Category | Radio Engineering |
| Part | |
| Title | A Simple Valve Circuit, and the Methods of Grid Potential Control |
| Author | Captain H. de A.Donisthorpe |
| Notes | Simple circuit, potentiometer method, with grid condenser & leak, using grid cells, notes on general adjustments |