BVWS Bulletin Volume 4, Number 2 (September 1979)

BVWS BulletinVolume 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.