J-MOD 100

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Open and Expressive

No compromise amp designed with John Mayer.

The J-MOD 100 amplifier was intimately designed by Paul Reed Smith, Doug Sewell, and John Mayer. With a thoughtful control platform, impeccable build, and high-quality components, the J-MOD 100 is a fully-realized, high-end piece of audio gear for players who want the purest and most expressive musical experience.

Thoughtful control platform and feature selection.

The J-MOD 100 amplifier is a single channel amp featuring a switchable gain stage and effects loop. The amp’s tone stack features a beautiful, spread out tone that is at once huge and clear. When the gain stage is kicked in, the amp gets rich in harmonics and delivers a bit more bite. The versatility provided by this setup allows the J-MOD 100 to deliver a huge variety of sounds whether using singlecoils or humbuckers.

Additional tone-sculpting features include a bright switch, which adds more high-end to your tone, and a presence control that boosts the high-end in the power amp section of the amplifier, giving you a livelier, more complex tone. There is no reverb built into the J-MOD 100, but an effects loop was requested by Mayer for his reverb tanks. The amp’s effects loop (and gain boost) is controlled by the footswitch, so players can use any reverb or effects unit desired with this amp.

Elegant and robust construction.

The J-MOD 100 amp features five separate boards, all with over-sized traces for tonal integrity. Each board is dedicated to a particular part of the circuit: preamp section, power section, front panel controls, bias jacks, and the effects loop. Not only is this an elegant way to build with fewer long wires extending across a larger board, it is also a more robust way to build as there is not a single, large board that needs to flex during transport. The amp is hand-wired at PRS in Maryland, USA with a truly artistic level of craftsmanship. The J-MOD 100 also features a “laydown-style” power transformer for build integrity.

High-quality components.

The J-MOD 100 pairs hand-crafted construction with top-of-the-line components, including a Cinemag output transformer and high-end capacitors in the preamp section. The result is authentic vintage tone with rich harmonics that sit at the player’s fingertips for a thoroughly expressive and transparent musical experience.

Built with serviceability in mind.

Mains fuse, B+ fuse, and bias adjustment jacks are accessible on the back panel of the amp, so changes and adjustments can be made without needing to open up the amplifier. In addition, the amp will accept many different power tubes types, including EL34, 6CA7, KT77 (with re-bias).


Available Configurations Head
Wattage 100
Output Transformer Cinemag Texas 100
Power Tubes (4) 6L6
Preamp Tubes (4) 12AX7/ECC83S
Back Panel Features
Inlet Fused Power Inlet (IEC)
Effects Loop Loop Return, Return Level, Send Level, Loop Send
Extension Speaker Jacks 3: 2, Parallel with 4 and 8 Ohm selector switch & 1, 16 Ohm jack
Ohm Switching 4, 8, 16 Ohms
Bias Fixed Bias, Adjustable (bias jacks accessible from back panel)
Cabinet Material / Construction Pine, Fingerjoint
Covering Stealth
Grill Cloth Untinted Salt & Pepper
Piping Gold
Amp Width 26" (66.04 cm)
Amp Depth 10" (25.4 cm)
Amp Height 10" (25.4 cm)
Amp Weight 39.8 lbs (18.05 kg)
Included Accessories
Included Accessories 2-Button Footswitch (Gain Boost On/Off, Effects Loop On/Off)
Preamp Tube Positions & Functions
V1 12AX7, Input Gain Stage
V2 12AX7, Overdrive Gain Stage
V3 12AX7, Effects Loop
V4 12AX7, Phase Inverter
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