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Randall RBA-500

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Page last updated Mar 31, 2026

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Description

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The Randall RBA-500 is a powerhouse in the world of bass amplification, designed to deliver robust sound with precision and clarity. This 500-watt bass amplifier head is perfect for both stage and studio settings, providing the versatility and power needed for any performance. With its all-solid-state design, the RBA-500 offers reliability and consistency, ensuring that your sound remains uninterrupted through every gig or recording session.

Equipped with a 4-band EQ, this amplifier head allows for detailed tone shaping, letting you dial in the exact sound you're after. The integrated compressor ensures your dynamics remain smooth, giving you control over your sound without any unexpected spikes. Additionally, the RBA-500 includes an effects loop, making it easy to incorporate your favorite pedals and effects into your setup. For those who value direct recording or silent practice, the built-in DI output is a significant advantage, allowing you to connect directly to recording equipment or a PA system.

One of the standout features of the Randall RBA-500 is its robust overdrive circuit, which adds a layer of grit and growl to your tone, perfect for when you need a little extra punch in your low end. This makes it an ideal choice for bassists looking to explore a range of sonic textures.

Key Features:

500 watts of power for stage and studio use
All-solid-state design for reliability
4-band EQ for detailed tone shaping
Built-in compressor for smooth dynamics
Effects loop for easy pedal integration
DI output for direct recording or silent practice
Robust overdrive circuit for added tonal texture

Videos

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Caleb Andresen

1980s Randall RBA-500 Bass 500 Sound Demo - Brutal Rock, Doom & Stoner Tones!

Caleb Andresen

Randall RBA 500 Stoner Doom test- Holy Mountain by Sleep

TheTurtleneck64

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Randall RBA-500.

Features and functionality

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The Randall RBA-500 is known for its warm, solid-state sound with great cleans and the ability to add grit with a gain knob.
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This amp head operates at 300 watts at 2/4 ohms and 500 watts at 8 ohms, making it versatile for different cab setups.
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The Morley 20/20 Fuzz Wah offers automatic wah activation when the expression pedal is engaged, contrasting older models with manual footswitch activation.
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The Morley Cliff Burton Tribute Power Fuzz Wah reduces noise issues seen in older models and uses a bulb/light sensor for the wah effect.
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Use cases and applications

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It is praised for handling tight metal bass tones, suggesting compatibility with heavier music styles.
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The RBA-500, combined with a Road 2x18 cab, replicates Cliff Burton’s sound from "Kill 'Em All" and "Ride The Lightning," appealing to those chasing his iconic tones.
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Comparisons

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Some users believe it may be similar to the Sunn Coliseum head, indicating a comparable tonal or build quality.
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The RBA-500 is noted for being part of Cliff Burton's rig for the first two Metallica albums, adding historical significance for fans seeking authenticity in their setups.
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The RBA-500 and Road cabinets are described as cool collectibles, but modern alternatives like the Tech 21 VT500 with Barefaced 2x12 offer lighter, more powerful setups.
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The Morley 20/20 Fuzz Wah is noted for its compact size, making it more suitable for pedalboards compared to the Cliff Signature model.
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Mods and upgrades

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Users discuss pairing the RBA-500 with a Morley Tel Ray Power Wah Boost and Maxon OD9 overdrive to achieve Burton-like distorted wah and overdriven tones.
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The Rickenbacker 4003 bridge pickup is often swapped for a Seymour Duncan Quarter Pound J, while the neck pickup is replaced with an EB-0 for a more authentic tone.
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Cliff Burton's iconic sound included a hidden Strat single-coil pickup under the bridge, installed by mortising a pocket for it, adding unique tonal depth.
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User experience

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Owners highlight the challenge in balancing tones with a mudbucker pickup, which often clips the input and overshadows other pickups, requiring careful EQ adjustments.
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Cliff Burton

Bassist

Metallica

Verified via YouTube

At 59:56 you can see Cliff playing with the Randall RBA-500 and the Road 218 cab. He also mentions the amp in a handwritten note (http://whichbass.co.uk/wbwp/wp-content/uploads/2018/01/Cliff-Burton-Handwritten-note.jpg)

Rex Brown

Bassist

Pantera

Verified via YouTube

In this video at 13:34 is is said that Brown used two Randall RBA-500 ES Amp Heads, he wound run each of these Heads through one 4x10 Cabinet and most likely one 1x15 cabinet.

This setup was used until the relese of "Cowboys From Hell" in 1990.