Reverend Greg Koch Gristle 90 TT

Reverend Greg Koch Gristle 90 TT review

The Reverend Greg Koch Gristle 90 TT is a T-style signature guitar built around a chambered Korina body, a set-in roasted maple neck, and two Fishman Greg Koch Gristle 90 pickups. Its specifications also include an onboard mid-boost, a push-pull phase switch, and a Bigsby B-50 tremolo paired with a roller bridge. The listed price is 1790, with no currency specified in the supplied information. The model has been available since November 2025.

This configuration combines a familiar control layout with additional electronics and a vibrato system. The published specifications identify the components and controls, but they do not establish how the guitar sounds, feels, or performs in use. No customer reviews are available, so this assessment is based on the listed construction and features rather than user feedback or listening tests.

Body, neck, and fingerboard

The chambered Korina body is finished in Tosa Turquoise and has a cream pickguard. No separate top is listed. Chambering is a construction detail, not a published weight figure, so the available specifications do not support a claim about the instrument's actual weight or balance.

The neck is made from roasted maple and set into the body. Reverend specifies a medium oval neck profile, a 43 mm nut width, and a 629 mm scale length, also given as 24.75 inches. The fingerboard is ebony with white dot inlays. Its compound radius runs from 254 mm to 355.6 mm, changing gradually along the board. The guitar has 22 jumbo frets and a Boneite nut.

These measurements describe the neck's layout, but they cannot determine whether its profile or fret size will suit a particular player. The compound radius and medium oval profile are useful details for comparing the guitar with instruments a buyer already knows. A hands-on inspection would still be needed to assess fretwork, setup, and individual comfort.

Pickups and controls

Two Fishman Greg Koch Gristle 90 pickups provide the guitar's pickup configuration. The controls include volume and tone, a three-way pickup switch, a Fishman Mid-Boost, and a push-pull phase switch. The mid-boost is specified as a way to produce a hotter sound. The phase switch adds another selectable wiring option, though the supplied information does not describe its precise tonal effect in this circuit.

The boost has a USB charging connection. No battery capacity, charging time, operating duration, or boost range is provided, so those details should be confirmed with Reverend or a dealer before purchase if they matter to your setup. The listed controls offer more switching options than a basic volume-and-tone arrangement, while retaining those conventional controls as the starting point.

Pickup names and control functions are not a substitute for a sound test. The specifications alone do not reveal the pickups' output, frequency response, noise level, or how they interact with an amplifier. Buyers comparing this model with other guitars should listen to it through their own intended signal chain where possible.

Tremolo and hardware

The vibrato system is a Bigsby B-50 paired with a roller bridge. Reverend also lists pin-lock machine heads and chrome-plated hardware. The roller bridge is part of the stated tremolo setup, but the specifications do not provide tuning-stability measurements or describe the system's range of motion. Those results can depend on setup, string condition, and playing technique.

The factory string gauge is listed as.010 to.046. That gives buyers a reference point for the supplied setup, although strings may be changed before delivery or during normal maintenance. The package does not include a case or bag, so either would need to be sourced separately if protection during transport is required.

Specifications and buying notes

• Model: Reverend Greg Koch Gristle 90 TT, Greg Koch signature model
• Body and finish: Chambered Korina, Tosa Turquoise, cream pickguard
• Neck and fingerboard: Set-in roasted maple, medium oval profile, ebony fingerboard
• Scale and frets: 629 mm scale, 22 jumbo frets, compound fingerboard radius
• Electronics: Two Fishman Greg Koch Gristle 90 pickups, mid-boost, push-pull phase switch
• Tremolo and bridge: Bigsby B-50 and roller bridge
• Item number: 629408

Verdict

The Gristle 90 TT is a feature-rich T-style signature model on paper, with a chambered Korina body, set-in roasted maple neck, dual Fishman pickups, rechargeable mid-boost, phase switching, and a Bigsby B-50 system. Its detailed neck measurements and listed string gauge give buyers useful points of comparison. The main unanswered questions are practical ones: how the neck feels, how the pickups sound through the player's rig, how the boost behaves, and how well the tremolo setup holds tuning. With no customer reviews or test results available, those aspects should remain unclaimed until the guitar can be evaluated directly.