In October of Marshall began using stickers printed with serial numbers and bar codes. Under the JCM "regime", the model numbering was changed. This cabinet were in production form up to This cabinet was primarily meant as an extension cabinet for the Bass combo. Clammy , Jan 28,. Photograph of a JCM head. Some amps won't fit into these series like the recent Class 5 Combo or various signature and limited edition models , so using the serial number will be your best bet to hone in on a specific date of manufacture. No, create an account now. Jmp jmp be logged in to post a comment. Low gain input produced a really nice clean.


The model codes below should help you identify which model you are, while the numbers described for each year should help with dating. Starting in July , Marshall starting using official serial codes. They were initially broken down into three parts: the model code, the serial 4x12 number and the history code. Marshall jcm amps as a date code to represent year of production. It's important to note that, prior to , this letter came last. The letter B was skipped, as were the letters I, O and Q since they might be confused for numbers. Use the model codes and date codes below to determine the model and age of your amp. From January to September , the three-part coding was used by Marshall but the date code letter was moved from the end to the middle. The same model codes from the serial section of this article still apply, although the model code "RI" is also seen for reissues. The additional date numbers for this era are below. Starting in October , Marshall moved away from stamped metal plate serials and began using stickers with a xx-xxxxx-xx format serial and a bar code. Cabinets had serials at this point as well. The sticker-based nine digit scheme jcm through July For example, the serial number would tell us that this amp was made in 96 , production number , and it was made during the 34th 34 week of that year. Starting in August , Marshall moved to their current serial number scheme, which is easier to understand and gives good information than previous amps. These current serial numbers are arranged in a letter-ten cabinet-letter format A-xxxx-xx-xxxx-A.

Email: billy guitars. The charts below will explain how to read the serial numbers and decode the model numbers. From July of until September dating marshall jmp the date code system included a letter of alphabet in the serial number.

Here are the letters with their corresponding years. The letter B was skipped because the letter A was used for 18 months and the letters I, O and Q were also skipped to avoid any confusion being mistaken for numbers. The serial number on a Marshall amp is usually located on the back panel of the chassis but some amplifiers made between and had the number on the front panel.

From July to Decemberthe letter denoting the year was put after the serial number. For example:. From January to October the date code letter was put before the serial number. Photo credit: Mike Bratihwaite at Cathedral Stone. Starting in until Marshall switched over to a new serial number system.

The new system designated the year of manufacture in the first two digits of the number and the week of manufacture in the last two. This number is found under the bar code. Photo credit: SlashMarshall. In Marshall changed to the latest date code system. It is very easy to read because the year is directly followed by the week. Skip to content. Billy Penn's Guitars. X What are you looking for? July September First here is a chart with the model numbers and what they mean for this era.

For example: Year of manufacture is in the 42 nd week. For example: Year of manufacture is in the 22 nd week. I am in every other Saturday.

I do all the tech work myself so you deal directly with me. I am a one man shop and my hours can vary so please dating marshall jmp me to confirm that I will be open.

Email me: billy guitars. Reissue Series. Super Bass — Watt. Super Dating marshall jmp — Watt. Super PA. Tremolo — Watt. Tremolo — 50 Watt. N- C- P- D- R- E- S- F- T- G- U- H- V- J- W- K- X- L- Y- M-