This is a vintage 1965 Dallas Arbiter Rangemaster Treble Booster guitar pedal. This extremely coveted pedal, serial number 161594, or effects unit rather, has been famously used by Eric Clapton, Brian May, Marc Bolan, Tony Iommi and Ritchie Blackmore, to enhance the overall gain and presence of the notoriously dark British-made amps of the ’60s. With a simple tag board circuit consisting of a single germanium Mullard OC44, a Plessey electrolytic cap, and a couple additional caps and resistors, the unbelievably elementary design is ironically the most copied vintage effect ever made, yet, not even a faithful reproduction has quite been able to capture the essence of the incomparable Rangemaster. This Rangemaster has a more common Mullard OC44 germanium transistor, and it produces a very quintessential treble boost tone.
This particular example sounds fantastic. It literally makes any rig sound at least 25% better. It works perfectly, and is in highly presentable nicely preserved cosmetic condition. The original plexi faceplate is structurally perfect, the original chrome border is included, though cracked in the corners, and it includes (4) reissue gray feet. Internally, it is entirely original aside from the PP4 battery terminal that has been replaced for a modern 9v adapter.