The Catalinbread Naga Viper is a treble booster from Portland pedal builder Catalinbread, built on the classic Dallas Rangemaster circuit. Where the original Rangemaster had a single control, the Naga Viper adds two more, giving a system of three knobs: Boost, Heat and Range1. The idea is the same one players used Rangemasters for in the 1960s and 1970s, boosting a cranked tube amp into a juicy, harmonic-laden rock tone that cuts through the mix1, but with far more control over how the boost behaves.
The pedal has gone through several versions. The original dates to 2011, a Gallery Series limited edition followed in 2020, and the current MKII was unveiled at NAMM 2024234. Premier Guitar reviewed the standard version in 2021 and found it delivered roughly 10 dB of gain with the Boost control dimed, all in a bright, custard-yellow stompbox that is tough to miss on a pedalboard5.
A Rangemaster-style treble booster with more range
The Dallas Rangemaster is the circuit the Naga Viper descends from. Catalinbread's version is essentially an update on the classic Dallas Rangemaster Treble Boost, as gearnews put it, and Catalinbread's own product page for the MKII describes the classic Rangemaster design as the reference point for the circuit76. Aion FX's technical analysis notes that the Naga Viper adds versatility to the one-knob Rangemaster design by including an input capacitor blend, labeled Range, a control Catalinbread has also used on pedals such as the Katzenkönig and Sabbra Cadabra9.
A traditional treble booster does one thing: it lifts the high frequencies of a signal feeding an amp that is already working hard, tightening the low end and pushing the front of the amp into singing overdrive. The Naga Viper keeps that character but lets a player shape it. Delicious Audio described it as a booster that lives in the grand old tradition of the Dallas Rangemaster, with the difference that its Range knob is a continuous control allowing a move from classic treble boost to a full-range boost and anywhere in between10.
The controls: Boost, Heat and Range
All three knobs are carried across the versions, including the MKII. Catalinbread's product page describes what each does6:
| Control | What it does |
|---|---|
| Boost | Sets the output level of the pedal. Set fairly high for overdriving amps or overdrive pedals. |
| Heat | The gain knob. At its lowest it is a slightly dirty boost; rolled up it becomes a drive unit in its own right. |
| Range | Controls how much bass is let into the booster. Rolled down, more bass enters and the range increases; all the way down it is a full-frequency booster that also raises the gain. |
The Heat control is the biggest departure from the Rangemaster. The original Rangemaster was fixed at maximum gain, while the Heat knob gives control over the gain level and saturation11. Premier Guitar's reviewer went further in explaining how it behaves:
"The Heat control is essentially an internal gain circuit, and while it produces no additional dB increase in the output, it creates the perception of a much louder, hotter signal."
That same review found Heat adds noise, compression, presence and articulation as it goes up, and a hissy distortion at its highest settings5. Gearnews' take on the MKII was similar: the Heat control acts as an overall gain knob, giving a classic treble boost at the lower end and plenty of dirt at the top12.
Working as a full-range boost
Because Range is continuous, the pedal is not locked into treble-only duty. Guitar.com's coverage of the Gallery Series noted that Range lets players adjust the boost from treble-focused to full-range13. Premier Guitar's reviewer found that lowering the Range control opened up the low end without changing the high-frequency response, though even with Range at its lowest setting the Naga Viper still cuts some low frequencies, evoking the sound of a clean JCM800 Marshall low end5. Players looking for a boost that keeps the whole spectrum may prefer a clean boost design; Guitar.com's buying guide to clean treble boost pedals places the MKII in the Rangemaster-emulating camp rather than the flat-boost one14.
History and versions: Rangemaster roots, Gallery Series and MKII
The Naga Viper line has three main chapters.
2011: the original. Premier Guitar's launch coverage described it as Catalinbread's take on the Rangemaster, adding two controls, Range and Heat, to the original's single Boost control1.
2024: the MKII. Catalinbread unveiled the Naga Viper MKII at NAMM 2024, available now2. The changes center on the transistor: the MKII swaps germanium for a silicon transistor tuned to emulate a classic Dallas Rangemaster's character, making the circuit hotter142. Gearnews also reported an added dampening controller alongside the updated transistor, allowing the pedal to cope with higher levels of heat12.
The Gallery Series Naga Viper was a limited edition, offered in limited quantities in 202011. The MKII is the current version, available since January 20242.
What reviewers said
Premier Guitar's 2021 review of the standard custard-yellow version measured roughly 10 dB of gain with Boost dimed and found the Range control opened the low end without altering the high-frequency response, at a street price of $1695. Of the MKII, Gearnews' George Loveridge wrote that Catalinbread had worked on the overall feel and use of the treble booster, providing players with more control and tone12. Guitar.com's 2026 buying guide of clean treble boost pedals noted the MKII's silicon-for-germanium swap as its defining change14.
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Questions
What does the Heat knob do on the Naga Viper?
Heat is the pedal's gain control. The original Rangemaster ran at fixed maximum gain, while the Naga Viper lets you dial the gain level and saturation yourself. Premier Guitar's reviewer described it as an internal gain circuit that adds no extra decibels of output but creates the perception of a louder, hotter signal, along with compression, presence and articulation, and hissy distortion at its highest settings.
How much gain does the Catalinbread Naga Viper have?
With the Boost control dimed, the Naga Viper delivers roughly 10 dB of gain, according to Premier Guitar's review. That is enough to push a tube amp into overdrive, which is the traditional role of a Rangemaster-style treble booster, but it is a boost rather than a high-gain distortion pedal.
Can the Naga Viper work as a full-range boost?
Yes. The Range knob is a continuous control that moves from a classic treble-focused boost to a full-range boost and anywhere in between. Rolling it down lets more bass into the booster. Premier Guitar's reviewer noted that even at its lowest setting the pedal still cuts some low frequencies, so it never becomes completely flat.
What is different about the Naga Viper MKII?
The MKII, unveiled at NAMM 2024, swaps the germanium transistor for a silicon transistor tuned to emulate a classic Dallas Rangemaster's character, making the circuit hotter. It also adds a dampening controller that lets the pedal cope with higher levels of heat. Its three controls, Boost, Heat and Range, work the same way as before.
Is the black Naga Viper a limited edition?
The black enclosure belongs to the Gallery Series limited edition from 2020, which featured UV-printed custom artwork by Colin Shawcross. The neon-yellow version was sold at catalinbread.com and the black enclosure only through Catalinbread's Reverb.com store, both in limited quantities. The standard Naga Viper shipped in a custard-yellow enclosure.
Sources (14)
- Catalinbread Introduces the Naga Viper Treble Booster, Premier Guitar, 2011-08-22
- NAMM 2024: Catalinbread revamps its Rangemaster-inspired Naga Viper, making MKII hotter and more practical, taking the treble booster circuit “to its logical limit”, MusicRadar, 2024-01-22
- Catalinbread crams a Rangemaster-like circuit, and more, into limited-edition Naga Viper treble boost, Guitar World, 2020-08-25
- Catalinbread announces new Naga Viper Treble Booster Gallery Series, gearnews.com, 2020-08-18
- Catalinbread Naga Viper Pedal Review, Premier Guitar, 2011-10-18
- Naga Viper MKII, Catalinbread Effects
- Stomp Under Foot recreates two classic effects with the Silver Foxx and Cherry Bomb, gearnews.com, 2020-10-01
- Sabbra Cadabra White (B-Stock), Catalinbread Effects
- Hydra Treble Booster / Catalinbread Naga Viper, Aion FX, 2019-11-28
- Catalinbread Naga Viper Treble Booster, Delicious Audio, 2021-01-12
- Catalinbread Introduces the Limited Edition Naga Viper, Premier Guitar, 2020-08-19
- Naga Viper MKII: Classic Treble Booster for Modern Players?, gearnews.com, 2024-01-23
- Catalinbread launches the Gallery Series with custom art Naga Viper, Guitar.com, 2020-08-19
- The 10 best boost pedals for guitarists 2026, from budget to boutique, Guitar.com
