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Maxon TBO-9 True Tube Booster/Overdrive Guitar Effects Pedal |
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| Features Usability Sound Documentation & Product Support Price Other Comments Contact Info Overall Rating—Product Summary |
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The TBO-9 is an overdrive pedal with a US military spec miniature tube at its core. The pedal contains both the aforementioned tube section as well as a solid state section, and by way of “cascading,” both sections work together in similar fashion to many tube amps. The unit contains four knobs (Drive, Boost, Level, and Tone), which at first appear to be standard fare, but they react differently and are more interactive than any other overdrive we have used. As with other Maxon pedals, the TBO-9 also features true bypass operation. The Maxon TBO-9 pedal's circuit features a clean blend function built into the Drive control. For example, at zero drive, the TBO-9 passes clean signal only along to the tone and amplifier stages of the pedal. However, this clean signal is fed from the tube section of the pedal, whose gain can be adjusted via the Boost control. As the Drive control is increased, the solid-state distortion circuit is blended with the tube-driven clean signal. In this manner a wide variety of clean boost, semi-clean, overdriven, and fully distorted tones can be achieved simply by manipulating the pedal's Drive and Boost controls. The unit also comes packed with Maxon’s proprietary AC2009 DC Power Adapter, a necessity since AC battery operation isn’t possible. While this may all sound a bit too complicated for the layperson, you don’t need a degree in electronics to operate this unit — just let your ears do the work.
Because of its complex circuitry and high power requirements the pedal requires a unique power supply in the form of Maxon’s AC2009, which ensures a consistent regulated high (and noise free) current. Conveniently, the AC2009 is included with the TBO-9, but it deserves repeating that this is the sole power supply and there is no battery operation. We were able to use a standard Boss 9-Volt adapter successfully with the unit with no perceivable loss in sound or increase in the noise floor, so compatibility with popular pedalboard power supplies shouldn’t be a problem if your system meets the power requirements of the pedal (with a Voodoo Labs PP2+ we would suggest using one of the Line 6-compatible power jacks, but note that using non-Maxon power supplies may invalidate the pedal’s warranty. Check with the pedal’s distributor before experimenting).
If there is an amp that responds better to clean boosting than the 50 Watt Marshall JCM800, we certainly don’t know about it! So it was this amp we turned to when we tested the TBO-9’s clean boost capabilities. As expected, the unit worked as anticipated, slamming the front end of the amp and also providing a slight volume boost — perfect for making solos jump out of the mix. We heard minimal coloration to our base tone and the pedal remained fairly transparent. While we preferred this transparency, some players prefer the “mid hump” that pedals like a classic TS-9 provide, so your mileage may vary. In clean boost mode we began to dial in the Drive and Boost controls and our JCM800 transformed from light Marshall crunch to a fire-breathing high gain monster! Even better, the sound remained hiss, hum and feedback free (despite all the gain) and the overall tone took on a spongy/saggy feel in a pleasing way. Unlike some overdrive pedals (such as the Ibanez TS-9 or Boss SD-1) the Maxon doesn’t suck the bottom end out of the tone when engaged. In fact, by dialing in the Boost control we were able to fatten up our tone, especially nice when playing through one of our single-coil equipped Strats. Next we moved over to a Rivera Hundred Duo Twelve and dialed in a clean Fender-style tone. The goal here was to see how well the TBO-9 behaves as a pure overdrive. With the Gain up full, the Boost and Tone at about noon and the Level set to unity, we were able to go from clean to mean effortlessly by engaging/disengaging the pedal. As a pure overdrive the TBO-9 produces an overdriven sound similar to that of a classic Tube Screamer, but embellished in the sense that we could not perceive any obvious frequency spikes (especially in the midrange), and the overall sound was much smoother and fatter. Like all Maxon pedals, the TBO-9 features mechanical true bypass switching which ensures silent operation and zero “tone suck” when the unit is between your guitar and amplifier.
As we also concluded in our review of Maxon's spectacular PAC-9 Pure Analog Chorus, the price tag is the only gripe we have with this otherwise excellent pedal. Contact InformationGodlyke Distributing Inc. Overall Rating - Product Summary |
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John Quigley is a professional guitar player and member of the NJ classic rock cover band Side Effects. Contact him via email here. |
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The Maxon TBO-9 True Tube Booster is well designed, well constructed, and sounds great in virtually all settings and applications… and carries a big price tag to go with its big sound. But if you like this model as much as we do, perhaps it’s better to pay a little more for a product of quality rather than sacrifice your tone in favor of something cheaper. 
