The Frantone Thunderhead is a bass booster pedal: a simple, easy-to-use boost built to add low-end weight to a bass or guitar signal. Its one defining feature is a tone filter that boosts the frequencies below 300 Hz, which is where the body and bottom of a bass tone live. Frantone describes it as built for bass or guitar, and says it is ideal for the bass player who wants even more bottom, or the guitar player looking for more punch and a thicker sound1.
If you are filling out the low end of a bass rig, the Thunderhead sits in the booster family rather than the overdrive, distortion or fuzz camps: it shapes and lifts what your instrument already puts out instead of adding clipping of its own1.
What the tone filter does
The Thunderhead's tone filter boosts the frequencies below 300 Hz1. On bass, that is the region that gives a note its weight, so lifting it is a way of getting more bottom without changing your playing technique or your amp settings. On guitar, the same lift adds punch and thickness, which is how Frantone positions the pedal for six-string use1.
Because the pedal is described as simple to use, there is not a deep control surface to learn: the tone filter is the heart of what it does1.
Build, switching and power
Frantone builds each Thunderhead by hand in the USA1. The pedal runs in true bypass switching, so when it is off, your signal does not pass through its circuit. The maker notes that all new Frantone effects come with full signal bypass and a status light1.
The Thunderhead's product page lists an external power jack as its power connection. No battery option is listed, so plan your pedalboard power around an external supply1.
The case is a tough cast aluminum enclosure, finished in what Frantone calls a space age hammered metallic blue lacquer, with custom white Bakelite knobs and a matching finish detail1.
Questions
Is the Frantone Thunderhead true bypass?
Yes. Frantone specifies true bypass switching on the Thunderhead, and the maker notes that all new Frantone effects come with full signal bypass and a status light. With true bypass, the pedal's circuit is removed from the signal path entirely when it is switched off, so it does not load down or color your tone when it is not in use.
Can a guitarist use the Frantone Thunderhead?
Yes. Frantone describes the Thunderhead as built for bass or guitar, and says it is ideal for the bass player who wants even more bottom, or the guitar player looking for more punch and a thicker sound. The tone filter boosts the frequencies below 300 Hz, which adds low-end weight on either instrument.
Does the Thunderhead take a battery?
The maker's product page lists an external power jack for powering the Thunderhead. It does not list a battery option, so plan to run it from an external power supply.
Where is the Frantone Thunderhead made?
Frantone builds each Thunderhead bass booster by hand in the USA, in a tough cast aluminum case finished in a space age hammered metallic blue lacquer with custom white Bakelite knobs.
Sources (1)
- Thunderhead, Frantone Electronics, 2026
