Marshall cab serial number dating

From July of 1969 until September of 1992 the date code system included a letter of the alphabet in the serial number.

Here are the letters with their corresponding years.

The JTM-45/ 100 (JTM-100) The JTM-45/100 with the “block” logo Pete Townshend and John Entwistle of The Who needed amps that could overpower the noisy and energetic crowds.

Marshall then “hot-rodded” the JTM-45 using four KT66 and two 50w output transformers to handle the extra wattage. The result was the JTM-45/100 (JTM-100, for short).

Another player that acquired some of those was Eric Clapton, who used them to tour with Cream.

The change to EL-34s The change to EL-34 tubes resulted in the increase of power. This is when the confusing model numbers started being used I believe. This amp had a more edgy sound than the JTM-45, due to the EL-34s.

Before starting, I must warn you that acquiring vintage gear can be really risky.

You can end up buying something that is not what you expected or even something that is damaged or modded beyond repair.

" And if your speaker is in reasonably good condition, then it is straightforward to find this out for yourself.This is the reason why Marshalls of this early era (up to 1968) are known as “Plexis”.The sound of this amplifier is “creamy” and “warm”. This amp is more suited for blues players, with a smoother sound.Since 1956, all Celestion chassis drivers have been stamped with a date code (two numbers and two letters), denoting exact date of manufacture.The codes are added on the production line and are placed on the speaker's chassis leg, on the front gasket or on a label on the magnet edge.

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Post a link of the desired amp on the “Ebay Watch Post”, so we can help analyzing it. I’ll concentrate on “how they sound”, “how they look like” and also “how to tell them apart”. It was made as a head and as a combo (known as the “Bluesbreaker” combo).

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