by Stephen Grosvenor
Introducing the new Rangebooster treble boost unit by Stephen Grosvenor.
(Author of "A Service Engineer's Guide to the Vox AC30 Valve Amplifier").
Based on a classic vintage treble booster (The Dallas Rangemaster), the Rangebooster uses a Germanium transistor at the heart of the unit to capture the vintage tone.
The secret weapon of many of the legendary great guitarists, the Dallas Rangemaster is now a very scarce item, and as a result, vintage examples of this classic treble booster command very high prices, putting them beyond the reach of mere mortals.
The Rangebooster (tm), provides an affordable solution, and offers the opportunity to capture the magic tone of the vintage units at a great price (£75 plus shipping).
The Rangebooster is ideal when used in conjunction with a Vox AC30 (or any valve guitar amplifier for that matter!), for capturing that elusive tone.
Faithful to the original design concept of the Dallas Rangemaster, the Rangebooster offers some modern refinements not present in the original Dallas units. In addition to being a floor pedal (the original Rangemasters were amp top units), the Rangebooster has:
1.Soft switching (Anti-pop).
3. An LED indicator.
Quality components and carbon composition resistors are used throughout, and each unit is hand built in a diecast enclosure. The pedals are constructed using point to point wiring, and a tag strip as found in the vintage Vox amplifiers,to ensure years of trouble-free service. A Duracell battery is fitted as standard, and battery drain for the Rangebooster is very low (less than 3.5mA) meaning that your battery will last a very long time.
The Rangebooster uses an OC44 Germanium transistor (or the military high specification equivalent CV7003), and the unique properties of the OC44 transistor require that each pedal is custom biased/tuned to achieve the optimum performance from the OC44.
The properties of the OC44 Germanium transistors are unique in the way that they respond to input signal frequencies, (gain increases with an increase in frequency), making them ideal for use in a treble booster. (See below)
Frequency Gain dB
80hz 1 0dB
200hz 3 9.5dB
500hz 7.5 17.5dB
1khz 14 22.9dB
2khz 24 27.6dB
5khz 37.5 31.5dB
10khz 40 32dB
20khz 42 32.5dB
In addition to the standard Rangebooster units, I can also supply an enhanced version that has four position switch selectable frequency response, and three position switch selectable bias level.
(Please contact me for details).
Rangebooster pedals are guaranteed for twelve months from date of purchase.
The Rangebooster costs £75 plus shipping (see below for shipping rates).
UK Shipping, Royal Mail Special Delivery insured - £6.50
EU Shipping, Royal Mail International Signed For Airmail insured - £11.00
Rest of World Shipping, Royal Mail International Signed For Airmail insured - £14.00
To buy a Rangebooster, click on the button below for your region, and the appropriate shipping charge will be applied to you order.
For United Kingdom
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For the Rest of the World
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