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Yamaha G100 Guitar Head

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Yamaha G100-II Head

$625.00

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Page last updated Feb 14, 2026

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Description

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Unleash your sound potential with the Yamaha G100 Guitar Head, a solid-state powerhouse that delivers both versatility and reliability for guitarists of all styles. Known for its 100-watt output, this amplifier head is perfect for both practice sessions and live performances. The Yamaha G100 is engineered with a robust EQ section that provides precise tone shaping, ensuring you can dial in the perfect sound for any genre. Its clean channel is celebrated for its clarity and depth, while the overdrive channel offers a rich, saturated tone that guitarists crave.

Designed for musicians who demand more from their gear, the Yamaha G100 Guitar Head features a user-friendly interface that makes tone tweaking a breeze, whether on stage or in the studio. The head is equipped with multiple inputs and outputs, making it compatible with an array of cabinets and effects setups. This amplifier head is not just about power; it’s about delivering a full spectrum of sound that can adapt to your musical needs.

Key Features:

100-watt solid-state amplifier head
Dual-channel design for clean and overdrive tones
3-band EQ for precise tone control
Multiple inputs and outputs for flexible connectivity
Rugged build for durability and longevity
Ideal for various music genres and playing environments

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Gear Geeks

Yamaha G100 amp head

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Yamaha G100 Guitar Head.

Comparisons

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The Yamaha G100-112 belongs to the Rivera series, known for early implementation of switchable A/B channels, distinguishing it from other amps of its time.
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The distortion on the G100 is often considered inferior, drawing comparisons to a Rat pedal but lacking its quality.
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Some users prefer the original G100 for its richer sound when both amps are dialed in, suggesting unique tonal characteristics between the versions.
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The G100 II provides a tonal range similar to a Fender Ultra Chorus but with more depth and tweakability, though not quite at the Twin Reverb level.
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Features and functionality

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The absence of an FX loop in the G100 is noted as a limitation for some users.
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The G100 series amps are noted for their solid-state reliability and clean, trebly tones, making them ideal platforms for pedal use.
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The G100 II's parametric EQ allows for precise tone shaping, especially effective at boosting the ~1200hz range to enhance sound on both Les Paul and Strat guitars.
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The amp's spring reverb is a notable feature, providing authentic reverb effects that are well-regarded by users.
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The G100 II includes "BRIGHT" and "FAT" pull knobs, similar to features found on the Twin Reverb and Classic 30, respectively, enhancing tonal control.
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Setup and maintenance

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Issues like a missing input jack nut can cause the jack to fall inside the chassis, easily fixable by securing with a new nut.
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Input jacks may suffer from poor contact due to wear; inspecting and possibly replacing them can resolve sound issues.
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Use cases and applications

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This amp can be an excellent choice for Rhodes pianos, although not as good as the JC120 for this application.
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Users report the amp is picky with cab pairings, thriving with certain 4x12 cabs like the Randall Jaguar, which enhances its growling, filthy tone.
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The amp serves as an excellent platform for pedals and is ideal for loud, clean applications, making it versatile for different musical styles.
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Mods and upgrades

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Users recommend the Mod 4EB2C1B reverb tank as a replacement to enhance sound quality.
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Swapping the original speaker with an Electro-Voice Force-12 significantly enhances sound quality and is recommended by users.
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User experience

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Owners find the G100-112 to be a "sleeper" amp, with surprising volume and power when the settings are maximized.
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Owners notice increased fret noise, which can be mitigated via the parametric EQ, making the amp highly customizable to user preferences.
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Billie Joe Armstrong

Singer, Guitarist

Green Day

Verified via YouTube

In this video on YouTube, Billie Joe Armstrong is seen playing with Green Day in 1990. Armstrong is using a Yamaha G100 in this performance. This is the original revision of the G100, as noted by the distinctive grill cloth.

Mike Dirnt

Singer, Guitarist

Green Day

Verified via Bassplayer

"My secret weapons were Yamaha G100 guitar heads from the late ’70s and early ’80s, which I used to play through my custom Mesa Boogie 6x10 cabinet" Mike's word about the Yamaha G100

Bob Mould

Singer, Guitarist

Hüsker Dü

Verified via Thirdav

The signal from the compressor was fed to two Yamaha G-100 solid-state heads running Marshall and Sonic 4 X 12 cabs - equiped with Celestion speakers. These in turn were slaved into a pair of Fender Concert valve amplifiers with stock JBL 12" speakers.

Steven Van Zandt

Guitarist

E Street Band

Verified via Photo

Seen in the Legendary No Nukes Concert, Steven uses the Yamaha G100 Head and 2x12 cabs. He used this amp during the Darkness and River Tours, until moving onto a Roland JC120