BVWS Bulletin Volume 4, Number 2 (September 1979)
Front cover: The S.G.Brown 'Crystavox' horn speaker of 1923/24.
| Page | Title | Summary/Notes |
|---|---|---|
| 21 | Loudspeakers Part 1. David Read |
A description of the operation of early loudspeakers. |
| 23 | The Search for a Top-Pip Emitter Part 5. Philip Beckley |
Creating an audio output valve. |
| 26 | Passive Grid Bias Battery. Philip Beckley |
A modern replacement for grid bias batteries. |
| 28 | A German Puzzle. David Read |
A 3-valve instrument by Haardt & Co, Aktiengesellschaft, Dusseldorf. |