From the Vault

WHAT'S THE TROUBLE?
Some hi-fi curiosities discussed by Harry Leeming.

INTERFACE
A look at the problems of equipment matching.

AMPLIFIER TO LOUDSPEAKER
The output end of the chain, examined by Gordon King.

PICK-UP TO PREAMPLIFIER
The input from gramophone records considered by B J Webb.

FM RADIO
By Angus McKenzie.

AUDIO PATENTS
The latest from Adrian Hope.

THREE LOUDSPEAKER DESIGNS
Some notes to inspire other constructors, based on the ideas of Richard Lee, Stephen Hutton and Edwin Ashton.

FOUR PICK-UP CARTRIDGES
B J Webb reviews the Grace F9E, Goldring G900 SE, Sonus Series and Empire 2000E/III.

MUSIC OF ISLAM
Paul Oliver discusses an important series of recordings.

DAME JANET BAKER
The 1976 Audio Award presentation, with a survey of recordings by John Freestone.