Where is the Serial Number on my Mesa Amp?

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Where is the Serial Number on my Mesa® Amp?

If you’ve ever had a hard time finding the serial number on your Boogie, this info will help. Serial number locations have changed on the many different models over the decades but in the last 20 years the location and format has remained fairly consistent.

 
Serial number 005 on an Original Mark I combo that guards Randall Smith's office

Post 1985 Guitar Amp heads and combos

As of the late ‘80s, Mesa began the use of a .75 inch x 1.5 inch decal that is often placed near the AC cord or IEC cable receptacle as shown in the picture above of this Dual Rectifier chassis.

Serial Number decal on a Dual Rectifier head
Serial Number decal on a Dual Rectifier head
 

For those new to some of the terminology, the chassis is metal and houses of all the knobs, switches, transformers, tubes and sockets  etc. - the 'guts' of the amp. The serial number of your amp is always going to be attached to this part of your amplifier.

The cabinet is the wood enclosure in which the chassis gets mounted. The cabinet is most often covered in vinyl with the exception of cabinets that are custom and covered in leather or custom hardwood cabs, or, rack mounted amplifiers.

The Chassis and the Cabinet. Important to distinguish between the two when looking for your serial number
The Chassis and the Cabinet. Important to distinguish between the two when looking for your serial number
 

On almost all post-1988 guitar amp heads and combos, the serial number decal will be on the underside of the amplifier chassis near the edge of the back panel, usually on one side or the other (not in the middle). Most of the time, the serial number is also close to the AC in jack.

Mark V Serial Number Location
Mark V Serial Number Location
 

Depending on the amp model and cabinet, the serial number decal can sometimes obscured by rear panels or other cabinet parts. Laying the amp on its face on a flat surface often provides a better angle to see the serial number decal.

Lone Star Combo laying on it's face for a better view of the serial number decal
Lone Star Combo laying on it's face for a better view of the serial number decal
 

Other amps may require the use of a flashlight, a small mirror held inside the cab or other visual aids to achieve a good enough angle to see the decal. Once you know the general area, do what it takes to get the numbers right.

Recto-Verb Combo serial number. Using a mirror to see the serial number decal without removing the rear panel
Recto-Verb Combo serial number. Using a mirror to see the serial number decal without removing the rear panel
 

Removing the rear panel may be necessary on certain amp/rear panel designs if the previously mentioned ideas don’t provide enough access to clearly see the decal and make out the serial number.

Recto-Verb Combo with it's rear panel removed to visually access the serial number decal
Recto-Verb Combo with it's rear panel removed to visually access the serial number decal
 

Bass Amps

More recently built Mesa bass amplification has its serial number decal placed either on the rear panel near the IEC AC receptacle...

M6 Carbine rackmount unit with it's serial number on the back panel
M6 Carbine rackmount unit with it's serial number on the back panel
 

...or the back underside middle of the chassis itself.

Walkabout rackmount unit with serial number decal on the underside of the amp towards the rear
Walkabout rackmount unit with serial number decal on the underside of the amp towards the rear
 

Some bass amps with serial number decals on the bottom of the amp AND built into head cabs will have to be disassembled from their head cabs to access the serial number. Assembly instructions for bass amp head cabs can be obtained from Mesa/Boogie Customer Service. The serial number is also printed on the quality control card (if available) which may allow you to avoid dis-assembly. In the case of the Titan below, the serial number is on the rear panel and is easily seen even when in the head cab.

Titan bass amp in it's head cab. Some bass amps built into head cabs with serial number on the bottom of the amp will require being removed from the head to see the serial number decal
Titan bass amp in it's head cab. Some bass amps built into head cabs with serial number on the bottom of the amp will require being removed from the head to see the serial number decal
 

Early Boogie Amps

Mesa amps built before serial number decals were in use (generally Pre-1987) have a variety of serial number locations and styles. Most common is a serial number that is stamped or punched into the metal rear panel and often under or near the speaker jacks.

Mark IIC+ serial number beneath the speaker jacks on the rear panel
Mark IIC+ serial number beneath the speaker jacks on the rear panel
 

And in the case of the amp that started it all, The Mark I serial number is made from the vintage DYMO labeling used to label the various rear panel features. Original Mark I chassis built between 1971-1978 will have a serial number that starts with the letter 'A' and follows with a number between 001-2999. Mark I Re-issue serial numbers begin with the letter H and stretch from 001 into the mid 2000s.

Mark I Re-Issue DYMO label serial number and location
Mark I Re-Issue DYMO label serial number and location
 

Most pre-1990 amplifiers will have a specific month and year date written between the preamp tubes on the underside of the chassis OR, occasionally on the inside of the chassis (visible once the chassis is disassembled from it's cabinet). Most of these amps will also include the initials of who tech’d the amp at that time before it went to final assembly  and ultimately shipped out to it's new home and owner.

Mark IIB Amplifier with tech and assembly date on the underside of the amplifier between all the tubes
Mark IIB amplifier with tech initials and assembly date on the underside of the amplifier between preamp and power tubes


Some people like to know the 'birthday' of their amps and many will be pleased to find Mesa techs initialing and dating the amps in plain view very near the serial number decal on the amps since 2008-2009. For amps built before then, birth date information may be available on the outside of the chassis near preamp tubes (as shown above) or, inside the chassis  which requires dis-assembly to see the inside) but these dates are not always available on every model.  If you still can't find the serial number, consider the possibility that a previous owner (or thief) may have removed the serial number decal or obscured a stamped number. Feel free to call MESA Customer Service at 707 778 6565 Monday-Thursday, 9AM-5PM Pacific time for further assistance if this hasn’t taken you right to the serial number information you've been searching for all this time!

If interested in getting a time frame for when your MESA gear was made, please click here.

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