Detail 01
Rectifier tube
Converts AC to DC for the amp's power supply. It shapes feel and sag, not the preamp voicing.
Product detailSKU #1274319722296
MESA/Boogie5AR4 Rectifier Tube
Independent shopping perspective
The Korena take
MESA/Boogie 5AR4 rectifier tube. A replacement part for tube amps that call for a 5AR4, not an upgrade you drop into anything.
Strong match
Who this is for
- Replacing a worn or failed 5AR4 in a tube amp
- Keeping a spare in the gig bag for rectifier failures
- Amp techs stocking common rectifier types
Consider the trade-offs
When to look elsewhere
- Amps with solid-state rectification — there is nothing to replace
- Players wanting a tone change rather than a repair
- Anyone unsure which rectifier type their amp takes
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
5AR4 type
Rectifier types are not freely interchangeable. Your amp's spec dictates which one it can run safely.
Detail 03
MESA/Boogie branded
Tested and sold under MESA's part number. Matches what their amps ship with from the factory.
Detail 04
$51 for a single tube
One tube, not a set. Amps with two rectifiers need two, and they should be replaced together.
Final check
Know before you order
- 01Sold as one tube. Check whether your amp uses one or two.
- 02Confirm your amp calls for a 5AR4 before ordering.
- 03Amps hold lethal charge. Have a tech swap it if you are unsure.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Can I use this instead of a 5U4GB?
Not automatically. The two are different rectifier types. Check what your amp's manual or chassis specifies before swapping.
02Will this change my tone?
A rectifier affects how the power supply responds under load, which shows up as feel and compression. It does not change preamp voicing.
03How many do I need?
This is one tube. Amps vary — some use a single rectifier, some use two. Two-rectifier amps should get both replaced at once.
04Does it need biasing?
No. Rectifier tubes are not biased like power tubes. Output tubes are the ones that need bias set.
