The VOX Treble Booster was one of Thomas' many stand alone effect units. This item plugged into your guitar jack and had an adjustable bass/treble control. The sonic range of this unit is quite wide. It can sweep from bassy bass to ear piercing bright treble. The units were prone to interference from stray radio signals. This artifact is quite annoying at any volume. These later year treble/bass models were manufactured by JEN while the early chrome versions were produced by JMI.
JEN also produced a very similar version of this effect for their own distribution. It was electronically identical and looked exactly like the VOX model except that the VOX on the label was replaced with JEN. They even kept the diamond pattern on their model.
Photos and editorial content courtesy Gary Hahlbeck, North Coast Music
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