RM Treble-Booster

BSM RM Treble-Booster

The BSM RM model is based on the British Range Master unit produced between 1965 and 1969, as used by Eric Clapton in John Mayall's Bluesbreakers. Eric also used the booster when playing in the legendary group Cream. Its biting, powerful sound is clearly in evidence on the Bluesbreakers "Beano" album. Blues rocker Rory Gallagher, Heavy Rock pioneer Tony Iommi and Brian May from Queen were also heavy users of the orginal Range Master unit. The Range Master unit was also used by G. Tipton & K.K. Downing of the British heavy metal band Judas Priest in the late 1970s years to push its amps in full-tilt heaven. The long yearned for new edition, now issued under the name RM from BSM, includes the same OC44 germanium transistors as the the original 1965 version.

Almost all British rock guitarists using single coil pickup guitars used a germanium Treble Booster from the late 60's to the mid 70's. By the end of the seventies, the Treble Booster was replaced by a new circuit from Japan, the so called Tube Screamer and other similar overdrive circuits. These were based on the old Treble Boosters and therefore had a very similar frequency response. The germanium boosters on the other hand, sadly fell into oblivion despite their unique and inimitable sound. The RM Treble Booster has been specifically designed for single coil and humbucking pickups with a relatively low/medium inductance, such as pickups in Fender, Gretsch, Burns or Gibson guitars. On these pickups, the RM produces (with the volume control of the guitar turned up to the max) a fat, biting and penetrating lead sound, minus any shrill characteristics. By lowering the guitar's volume control, many shades of crunch can be easily dialed in. Another thing to consider is that when a guitar amp's volume is turned up (reaching saturation), the power amp normally begins to mute the highs, which results in a duller sound. At an amp's full tilt, the RM Treble Booster allows a more transparent tone (covering the entire frequency range) to shine through. The presence control on the amp need only be minimally used (if at all). When vintage amps are used (such as the Fender Deluxe, Fender Bassman, Vox AC30, Marshall JTM 45 or Marshall Plexi) it is amazing what effect the use of a good treble booster has. It is also of interest to note that Eric Clapton used a new 2 x12" Marshall combo (Model 1962 with KT66 output tubes) with the Bluesbreakers, and 100 Watt Plexi heads with Cream. Brian May used a couple of VOX AC30 combos with the RM in front of the "Normal" channel.

The Treble Booster is inserted between guitar and amplifier, not into the FX loop. The magical tone is achieved by the interaction between guitar pickup, treble booster and amplifier. The unit is powered by a 9V battery with a current consumption of approx. 250 uA. The average output level is 10dBm, the maximum output voltage when the strings are struck really hard is 7V max. Note: The positive pole of the battery is ground. By turning the volume pot, the special circuit design makes noises - just like the orginal does!

Booster Image: RM Treble-Booster

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If you have any questions concerning our products, especially the BSM RM Treble-Booster, our tech-head and mastermind Mr. Bernd C. Meiser would be happy to talk to you. So don't hestitate any longer and send him an email to info@treblebooster.net or use the contact form to contact him.


Hallo Bernd Der RM Booster ist letzte Woche wohlbehalten bei mir angekommen. Ich muss sagen, das Teil ist der absolute Knaller! Nach langem suchen und ausprobieren (EQs und Wahs), habe ich nun endlich das gefunden, was mir immer für einen durchsetzungsstarken und markanten Gitarrensound gefehlt hat. Seitdem kann ich auch den Halspickup meiner Telecaster sinnvoll einsetzen ;-) Beste Grüße
Marco B.
Hi Bernd, I like to congratulate you again, because I try the pedals with my band and they are both awsome !! The RM Treble Booster is as good in rythm guitar or in lead guitar. I really like its "Roooarrr" sound. The Fuzz Bender is the Better Fuzz I ever had. I owned the BJF Pink Purple Fuzz, the MJM London Fuzz, and others ... Your Fuzz blow away the other. Bravo !
Julien (from Nancy/France)
Hallo Bernd! Habe den Rechnungsbetrag des RM Treble Booster nach ausführlichem Test inzwischen überwiesen. Da fragt man sich, was man all die Jahre ohne gemacht hat. Wahnsinnsteil. Glückwunsch! Nie mehr ohne... Vielen Dank und einen schönen Tag! Peter
Peter Vogel