The V840 Treble/Bass was a earlier release of the V8401 Treble/Bass Booster made by JMI in the United Kingdom. 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.
Included in the photo above is the original Treble/Bass Booster storage box and the leatherette cord restrainer.
Photos and editorial content courtesy Gary Hahlbeck, North Coast Music
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