The final page of this catalog shows the Continental organ alongside other sound equipment: microphones, echo unit, channel mixer and the VOX treble booster:
A miniature "overtone" unit which plugs into the amplifier adding a super extra "zing" to the treble. Inexpensive and easy to use, the VOX Treble Booster brings out the full tonal range of stringed instruments. A real boon to the lead guitarist.
$120
$150
$400
$425
$650
$650
$714
$795
$850
$995
$1000
$1049
$1090
$1250
$1600
$1875
$1898
$2695
$2800
$2800