Similar Best Sellers

Mesa/Boogie 5U4GB Rectifier Tube

Replacement Rectifier Power Tube

Write your review

Item ID: MB5U4GBRect

Backordered - More On The Way!

We expect more from Mesa/Boogie in just a few days. Order today to reserve yours now, risk-free. Estimated by May 20.

Notify me when in stock

Tubes Are Not Returnable

Sorry, tubes cannot be returned, so please call if you'd like help choosing.

Dual Rectifier Head Re-tube Kit

$390 and 00 cents

Roadster Re-tube Kit

$416 and 00 cents

Ask An Expert

Our expertly trained Sales Engineers are ready to help!

(800) 222-4700

What is a Sales Engineer?

Have one to sell?
Check out Sweetwater's Gear Exchange!
Learn More

Complete Your Order

Mesa/Boogie 5U4GB Rectifier Tube

$39.00

Mesa/Boogie EL-34 STR 446 Power Tubes - Matched Duet

$99.00

Buy all:

Mesa/Boogie 5U4GB Rectifier Tube

Backordered - More On The Way! – Notify me

Add to list

Most Popular Accessories & Related Items

Q: What is the purpose of a 5U4GB rectifier tube in a guitar amplifier?

The 5U4GB rectifier tube is a vital component in many tube amplifiers, responsible for converting the AC voltage from the power transformer into the DC voltage needed to power the amplifier's circuits. This conversion process significantly influences the amp's feel, contributing to characteristics like "sag" and dynamic compression, which are highly valued by guitarists seeking a classic tube tone.

Need additional help?

Q: What kind of sound and feel does the Mesa/Boogie 5U4GB Rectifier Tube provide?

The Mesa/Boogie 5U4GB rectifier tube is known for delivering a classic, vintage-style response. It provides a noticeable "sag" or compression, especially when the amplifier is pushed hard. This results in a more dynamic, touch-sensitive feel, allowing for expressive playing with a warm, organic tone that responds beautifully to your picking attack.

Need additional help?

Q: How do I determine if the Mesa/Boogie 5U4GB is compatible with my amplifier?

To ensure compatibility, always consult your amplifier's owner's manual or the existing rectifier tube in your amp. Using the incorrect rectifier tube type can cause damage to your amplifier. If you're unsure, a Sweetwater Sales Engineer can provide personalized gear advice to help you select the correct tube for your specific amplifier model.

Need additional help?

Q: What is the expected lifespan of a rectifier tube like the 5U4GB?

The lifespan of a 5U4GB rectifier tube can vary significantly based on usage, amplifier design, and operating conditions. Generally, rectifier tubes can last anywhere from 1 to 5 years or more with moderate use. Signs of a failing rectifier include inconsistent power, reduced output, or unusual noises. Sweetwater's free 2-year warranty covers defects.

Need additional help?

Back to navigation

This article was Written By

Our Product Research Team

Get to know them!

Mesa's Tube of Choice!

You'll find the MESA 5U4GB inside all the new Mesa/Boogie tube amplifiers. As M/B puts it, it's their "factory favorite" — and for good reason. The MESA 584GB is based on 1950s tube technology, and is essentially an improvement on the 5U4 design. Not only is the tube more reliable, but it's much more compact. In fact, it's about the size of a 6L6 power tube, so take caution when you're positioning it inside your amplifier. What you'll get is a traditional "vintage sag" with an elastic and compressed feel — very cool, MESA 5U84GB.

Mesa/Boogie MESA 5U4GB Rectifier Power Tube Features:

3-3/4" replacement power amplifier tube
Based on classic 1950s technology
Delivers that traditional vintage sag
Mesa/Boogie's "factory favorite" tube — found on all new amplifiers
Important Notice for International Customers: Mesa/Boogie products sold by Sweetwater are intended for use within the United States. We are unable to ship any Mesa/Boogie products outside of the US.

The Mesa/Boogie MESA 5U4GB sports amazing feel and exceptional quality — it's Mesa/Boogie's "factory favorite" power tube!

Resources

Guitar Amp Buying Guide

Back to navigation

Tech Specs

Type: Rectifier
Model: 5U4GB
Quantity: Single
Manufacturer Part Number: 750541F

What Makes Our Sales Engineers Great?

Sweetwater Sales Engineers are a world-class team of experts dedicated to you. Hand selected from across the globe, each brings a wealth of experience and expertise in the world of music gear to provide you with unparalleled service completely free of charge. Friendly relationships, real trust, and the right gear are only a call or a click away!

(800) 222-4700

Contact Your Sales Engineer

Back to navigation

Reviews

5.0

Customer Photos & Videos

It was a great experience to buy in Sweetwater. I live in Brazil and all the process was made online (of course the item was delivered into an American address). It was perfect! All the tubes were delivered in perfect condition, the schedule time was precise and worked very well. After installation, all the tubes are working fine, exactly as expected and no technician is needed to replace because all the mesa tubes are tested at mesa's hq and certified to allow the amps to do his job as it was built for.

My Mesa Boogie Mark V died on me!!! Grrrr This particular tube was the culprit. She's back singing like James Brown.

Just replaced my old 5U4GB Rectifier tubes and the Rectifier punch is back!

I replaced these after I purchased a used Mesa Triple Rec. It came with these installed, so I cant compare brands, but they sound GREAT.

It's hard to imagine a more quintessentially modern guitar amplifier than a Mesa/Boogie, and when Sweetwater guitarists want high-gain tone, Mesa is where they start. One thing we love about these amps is their sheer versatility, such as the massive range of tone you get from each channel, the freedom to use the tubes you love, onboard CabClone cabinet emulation, and MIDI control. And it's not just guitar amps - Mesa/Boogie's bass amps and pedals are equally cool. What's more, thanks to our incredibly close relationship with Mesa, you can even customize your own amp right here on Sweetwater's website! Get the sound and style you want from your next amp, with a Mesa/Boogie from Sweetwater.

See also: Amp Tubes, Mesa/Boogie, Mesa/Boogie Guitar Amp Tubes