BSM HS-S Master Treble Booster
BSM introduces the HS-S Master Treble Booster, an evolution of the brand's HS-S Treble Booster.
The main difference between the two models seems to be the addition of a volume control knob on this new version. Equipped with one of the earliest silicon transistors available, BSM's HS-S line aims at recreating the sound of the original Hornby-Skewes Treble Booster, one of Ritchie Blackmore's favorites to dial then-unexpected sounds out of an AC30 in the days of Deep Purple's Machine Head and Burn.
The unit is true bypass, but has no external power supply jack (only 9V batteries can be used).