Available Now at Northeast Music Center!
Bring the classic feel and response of tube rectification to your compatible amplifier with the genuine MESA/Boogie 5U4GB Rectifier Tube. Designed to deliver traditional vintage sag, compression, and an elastic playing response, the 5U4GB is MESA’s factory-favorite 5U4 rectifier and an excellent replacement for compatible MESA/Boogie amplifiers.
Available from Northeast Music Center, the MESA 5U4GB is selected for consistency and reliability—two qualities that are especially important in a rectifier tube.
• Genuine MESA/Boogie 5U4GB Rectifier Tube
• Traditional Vintage-Style Rectification
• Elastic, Compressed Playing Feel
• Produces Pronounced Vintage “Sag”
• Based on Classic 1950s 5U4 Technology
• Improved, More Compact Design than Traditional 5U4G “Coke Bottle” Tubes
• Selected for Reliability & Consistency
• Used in Compatible MESA Rectifier Amplifiers
• MESA SKU / MPN: 750541F
• Quantity: 1 Tube
A rectifier converts AC voltage from the power source into the DC current required by an amplifier’s circuitry.
Unlike solid-state diode rectification, a tube rectifier can introduce a voltage drop as the amplifier is pushed harder.
For the player, that translates into feel.
The response becomes more elastic and compressed, creating the familiar “sag” associated with many vintage tube-amplifier designs.
MESA describes the 5U4GB as producing a traditional vintage sag with an especially elastic and compressed response.
Push the amplifier harder and the rectifier responds dynamically with your playing.
Notes can feel softer under the fingers.
Attacks become more forgiving.
The amplifier develops a spongier, more fluid response.
For players who love the feel of tube rectification, that's exactly the point.
MESA currently offers both the 5U4GB and 5U4G, and there is a meaningful difference.
The 5U4G uses the traditional tall 1930s-style “Coke Bottle” construction and produces a slightly more controlled, less saggy response.
The 5U4GB is based on later 1950s technology, uses a more compact design, and delivers the more elastic and compressed feel of the two.
That makes the 5U4GB an excellent choice when maximum traditional rectifier sag and responsiveness are desired in a compatible amplifier.
Tube rectification is an important part of MESA/Boogie history.
When MESA introduced the Dual Rectifier in 1991, selectable tube or silicon-diode rectification gave guitarists the ability to change not only the amplifier's sound, but also its dynamic response and playing feel.
The 5U4GB continues to play an important role in compatible MESA Rectifier designs.
The MESA 5U4GB is similar in physical size to a 6L6 power tube.
Be especially careful to install the 5U4GB only in the amplifier's designated rectifier-tube socket.
This is particularly important when replacing rectifier and 6L6 power tubes at the same time.
Always verify your amplifier's tube requirements before installation.
At Northeast Music Center, we understand that tubes aren't interchangeable simply because they fit into a socket.
The correct tube type, quantity, and position are critical to proper amplifier operation.
Whether you're maintaining a MESA Rectifier amplifier, replacing an aging rectifier tube, or assembling a complete replacement tube set, Northeast Music Center can help you identify the correct tubes for your amplifier.
For players who want genuine MESA replacement components selected for consistency and reliability, the MESA/Boogie 5U4GB Rectifier Tube is available from Northeast Music Center.
