Westone Thunder 3A Bass Guitar with John East ACG EQ-01 Preamp, (Used)

The Westone Thunder 3A Bass is a characterful vintage-style electric bass with strong player appeal, known for its solid feel, distinctive Thunder-series identity and serious tonal flexibility. This example has been modded with a John East ACG EQ-01 preamp, giving it a much more advanced active tone-shaping system than a standard passive bass.

The ACG EQ-01 is a filter-style bass preamp designed for deep tonal sculpting, making this Westone especially appealing to players who want more than a simple bass, mid and treble setup. It is ideal for bassists who like to fine-tune their sound for different genres, rigs and playing situations.

This pre-owned example is listed in Very Good condition, meaning it shows some cosmetic wear consistent with careful previous ownership while remaining fully functional and ready to play.

At A Glance

Key Detail	Information
Brand	Westone
Model	Thunder 3A Bass
Type	Electric Bass Guitar
Condition	Pre-Owned, Very Good Condition
Modification	John East ACG EQ-01 Preamp
Electronics	Active EQ / Filter-Style Preamp System
Main Appeal	Vintage-style Westone bass with upgraded boutique active electronics
Best For	Rock, funk, soul, fusion, pop, studio work, live performance and tone-focused bassists
Skill Level	Intermediate to professional

Condition Overview

Very Good Condition

This Westone Thunder 3A Bass is in Very Good condition. This means it shows some cosmetic wear consistent with careful previous ownership, but remains fully functional and ready to play.

Very Good condition is ideal for players who want a clean and dependable pre-owned bass with normal signs of careful use.

What’s Included?

✔ Westone Thunder 3A Bass
✔ John East ACG EQ-01 Preamp Modification

✘ No Additional Accessories Included

Condition Notes

This bass shows light signs of previous use such as small marks, light surface scratches or minor handling wear consistent with Very Good condition.

The bass has been modded with a John East ACG EQ-01 preamp, giving it expanded active tone-shaping capability. This modification should be viewed as a significant player-focused upgrade rather than a fully original vintage specification.

No faults or repairs have been supplied for this listing. The bass has been checked for playability and functionality before sale.

Fair Deal Inspection & Assessment

This pre-owned Westone Thunder 3A Bass has been inspected and assessed by the Fair Deal Music team before being offered for sale.

Our checks include:

• Electronics tested
• John East ACG EQ-01 preamp checked
• Pickup output checked
• Control operation checked
• Output jack tested
• Battery connection checked
• Frets inspected
• Fingerboard checked
• Neck condition assessed
• Tuners checked
• Bridge checked
• Hardware inspected
• General playability assessed

Service / Setup Work

All pre-owned bass guitars at Fair Deal Music are set up and checked before leaving the shop.

This Westone Thunder 3A Bass has been assessed for playability, with the following checked:

• Action checked
• Neck relief checked
• Frets inspected
• Tuning stability checked
• Electronics tested
• Active preamp function checked
• Hardware checked
• Bridge setup checked
• Intonation checked

Please note that bass guitar setup can sometimes shift slightly during delivery due to changes in temperature and humidity. We take this into account during our checks, but wood can naturally move in transit.

Why Choose The Westone Thunder 3A Bass?

Distinctive Westone Thunder-Series Character

Westone Thunder basses have a loyal following among players who appreciate vintage Japanese-era bass design, solid construction and strong value compared with many more obvious vintage brands. The Thunder 3A has a distinctive identity that sets it apart from standard modern basses.

John East ACG EQ-01 Preamp Upgrade

The fitted John East ACG EQ-01 preamp gives this bass a serious tonal upgrade. Rather than a conventional cut-and-boost EQ, the ACG EQ-01 is a filter-style system designed for detailed shaping of low-end, midrange and top-end response.

Excellent For Tone-Focused Players

This bass is ideal for players who like to refine their sound. The upgraded preamp makes it possible to move between deep, rounded bass tones, more articulate modern sounds and focused mix-ready settings.

Great For Stage And Studio

A versatile active bass is extremely useful in both live and recording environments. The Westone Thunder 3A’s upgraded electronics make it practical for players who need a wide range of tones from one instrument.

Strong Alternative To Modern Active Basses

Many modern active basses offer useful EQ, but this Westone combines vintage character with a boutique preamp upgrade. That makes it a strong choice for players who want something more individual than a standard current-production bass.

Player-Focused Modification

The John East ACG EQ-01 upgrade makes this a bass aimed at players rather than strict collectors. It is especially appealing if you value tone, flexibility and usability over completely original specification.

Comparison Against Popular Alternatives

Westone Thunder 3A Bass vs Standard Passive Bass

A standard passive bass is simple and direct, but offers less onboard tone shaping. This modded Westone gives players far more control thanks to the fitted John East ACG EQ-01 active preamp.

Westone Thunder 3A Bass vs Modern Active Bass

A modern active bass can be very practical, but this Westone offers a more individual feel and vintage-style personality, combined with a high-quality boutique preamp upgrade.

Westone Thunder 3A Bass vs Fender Precision Bass

A Precision Bass is loved for its simple, direct punch. The Westone Thunder 3A is better for players who want a broader tonal range, more control and a less common instrument.

Westone Thunder 3A Bass vs Jazz Bass

A Jazz Bass offers classic two-pickup versatility and familiar Fender feel. This Westone will appeal more to players who want a distinctive alternative with more advanced onboard tone shaping.

Who Is It For?

Tone-Focused Bassists

The John East ACG EQ-01 preamp makes this a strong choice for players who like to fine-tune their sound from the instrument itself.

Studio Bass Players

The expanded EQ range makes it useful in recording situations where the bass needs to sit precisely in a mix.

Live Performers

Active onboard control gives you more flexibility when moving between different rooms, amps, pedals and band settings.

Players Wanting Something Different

This is ideal for bassists who want a distinctive pre-owned instrument rather than a standard modern production bass.

Rock, Funk And Fusion Players

The upgraded electronics give this bass the flexibility needed for punchy rock lines, deep funk grooves, smoother soul tones and articulate fusion playing.

Suitable Genres And Uses

This Westone Thunder 3A Bass is well suited to:

• Rock
• Funk
• Soul
• Fusion
• Pop
• Indie
• Alternative
• Blues
• Worship music
• Studio recording
• Live performance
• Rehearsals
• Pedalboard-based bass rigs
• Players wanting flexible active EQ
• Bassists looking for a distinctive vintage-style instrument

Educational Section: Why Choose A Bass With A John East ACG EQ-01 Preamp?

The John East ACG EQ-01 is not a basic onboard EQ. It is a filter-style preamp designed to give bass players a deeper and more precise way to shape their sound. Instead of simply boosting or cutting fixed bass, middle and treble bands, the EQ-01 allows more detailed filtering and tonal sculpting.

For players who like to adapt their sound to different songs, amps or rooms, this kind of preamp can be extremely useful. It can help create deep, warm bass tones, cleaner modern sounds, more focused mids or more open top-end textures depending on how it is set.

On a characterful bass like the Westone Thunder 3A, the ACG EQ-01 modification turns the instrument into a much more flexible working bass while retaining the distinctive feel and personality that makes older Westone instruments appealing.

Looking for advice on choosing the right used bass, active bass or modified instrument? Our experienced team of musicians can help by phone, online or in-store.

Story & Context: Westone Thunder Basses

Westone Thunder basses are well-regarded by players who appreciate older Japanese-style bass design, solid construction and distinctive looks. They sit outside the most obvious Fender and Gibson-inspired choices, which gives them a strong identity of their own.

The Thunder range has become popular with bassists looking for instruments that offer character, playability and value. A modded example like this adds even more player appeal by pairing the Thunder platform with a high-quality John East active preamp.

This Westone Thunder 3A Bass is therefore best understood as a practical, tone-focused player’s instrument: vintage-style character, upgraded electronics and a broad range of usable sounds.

Technical Specifications

Specification	Details
Product Type	Electric Bass Guitar
Brand	Westone
Model	Thunder III Bass
Version	Humbucker / Magnabass-Style Version
Country of Manufacture	Made in Japan
Factory	Matsumoku
Body	Ash
Neck Construction	Through-Neck
Neck Material	5-Piece Hard Maple and Mahogany
Fingerboard	Rosewood
Frets	22 Frets
Pickup Configuration	Dual Humbucker Bass Pickup Layout
Standard Pickup Type	Magnabass-Style Humbuckers
Current Electronics Modification	John East ACG EQ-01 Preamp
Bridge	Warwick 2-Piece Bridge
Hardware	Black Hardware
String Configuration	4-String Bass
Condition	Pre-Owned, Very Good Condition

Specification Note

This bass follows the standard Westone Thunder III Humbucker-style bass specification, including through-neck construction, ash body, hard maple neck, 22-fret rosewood fingerboard and dual humbucker-style bass pickup layout.

Please note that this example has been modded with a John East ACG EQ-01 preamp, so the onboard electronics should be viewed as upgraded from standard factory specification.

Power Requirements

This bass requires suitable battery power for the fitted John East ACG EQ-01 active preamp when plugged in. Use a standard 1/4" instrument cable and a suitable bass amplifier, pedalboard, PA system or audio interface.

Fair Deal Music Verdict

★★★★★ 5/5

The Westone Thunder 3A Bass is already a distinctive and appealing pre-owned bass, but the John East ACG EQ-01 preamp modification makes this example especially interesting for serious players. It offers vintage-style Westone character with a far more advanced active tone-shaping system, making it a strong choice for bassists who want flexibility, individuality and practical stage or studio usability.

This Very Good condition example is ideal for players who value tone, versatility and character over standard factory originality.

Why Buy From Fair Deal Music?

Choosing Fair Deal Music means buying from a passionate team of musicians who genuinely understand the products we sell. Whether you're purchasing your first instrument, upgrading your current setup or searching for something special, we're here to help you make the right choice with friendly advice and expert support.

When you shop with Fair Deal Music, you can buy with confidence thanks to:

Expert advice from knowledgeable musicians
Carefully checked new, used, pre-owned and ex-display equipment
Competitive prices on leading music brands
Secure UK-wide delivery
Flexible finance options available (subject to status)
Friendly support before and after your purchase
A trusted independent UK music retailer with decades of experience

Trade In. Trade Up. Save More.

Thinking about upgrading? Your next piece of gear could cost less than you think.

We're always happy to consider part exchanges and trade-ins on a wide range of musical instruments and equipment. Whether you're looking to upgrade your guitar, keyboard, amplifier, drum kit or studio gear, your existing equipment could help reduce the cost of your next purchase.

Simply get in touch with our team for a no-obligation valuation, and we'll be happy to discuss the options available.

It's an easy way to unlock the value of the gear you no longer use while making your next instrument even more affordable.

FAQ

What condition is this Westone Thunder 3A Bass in?

This bass is listed in Very Good condition, meaning it shows light signs of previous use while remaining fully functional.

Has this bass been modified?

Yes. It has been modded with a John East ACG EQ-01 preamp.

Is the John East ACG EQ-01 preamp a good upgrade?

Yes. The ACG EQ-01 is a high-quality filter-style bass preamp designed for detailed onboard tone shaping.

Is this bass fully original?

No. The fitted John East ACG EQ-01 preamp is a modification, so this bass should be viewed as a player-focused upgraded instrument rather than a fully original collector example.

Does this bass require a battery?

Yes. The fitted active preamp requires suitable battery power when the bass is plugged in.

What styles does this bass suit?

It suits rock, funk, soul, fusion, pop, indie, alternative, blues, worship music, studio recording and live performance.

Is this suitable for studio work?

Yes. The upgraded preamp gives the bass a wide range of useful tones, making it well suited to recording and mix-focused bass parts.

Is this suitable for live use?

Yes. The active EQ and flexible tonal range make it practical for live players who need to adapt quickly to different amps, rooms and band settings.

Is this a good bass for collectors?

It has vintage-style Westone appeal, but because it has been modified, it is best suited to players rather than collectors looking for complete originality.

Can I try this bass in-store?

Fair Deal Music has a large Birmingham showroom, and our team can offer advice on Westone basses, active basses and pre-owned modified instruments.