| Year | 1922 |
| Date | 02-Feb |
| Volume | 46 |
| Issue | 1,084 |
| Page | 115 |
| Category | Radio Engineering |
| Part | |
| Title | Thermionic Valves and Amplifier Circuits |
| Author | Captain H. de A.Donisthorpe |
| Notes | Circuit of the Marconi 55 type of amplifier, two-stage high frequency amplifier, various combinations of three-valve amplifiers |