| Year | 1933 |
| Date | 02-Nov |
| Volume | 69 |
| Issue | 1,695 |
| Page | 423 |
| Category | Electronic |
| Part | |
| Title | Two "Model Engineer" Class "B" Units |
| Author | Anthony Rider |
| Notes | Constructional Details for Building an Efficient Class "B" Unit for use with any existing 2 or 3-valve Battery Set. What is class"B"? Can be built in an evening, connecting up the units, recommended parts for unit no. 1, recommended parts for unit no. 2, |