Dating vintage marshall amps
While there are serial-like numbers during this era, no standard serial number format has been identified.
The model numbers can be somewhat confusing because model numbers such as or can be mistakenly interpreted as the production year of the amplifier. The output transformer turned 90 degrees in comparison to earlier models to reduce hum.
GZ34 rectifier no longer used. The earliest Marshall amplifiers were made in and had no model or serial numbers. Cabinets have corner-lock joints with a quality control signature inside.
Handles changed to plastic with larger end cap.
Power tubes are KT66, 6L6 and Letters B, I, O and Q were not used to avoid confusing letters with numbers. The full identifier of these amps was initially comprised of a model code, the serial production number and the date code. Leave a Comment Cancel dating vintage marshall amps You must be logged in to post a comment.
The table below outlines the meaning of these letter codes. Larger black cabinet feet starting in Julychanged from small and gray. Single 50W Drake output transformers rated at 3, ohms, part numberfor 50W models.
Marshall amplifier serial numbers made simple
Dagnall transformers used in the JTM, changed from Drake. Single W Drake transformer, rated at ohms, part numberfor W models. Gold Plexigas back panel, changed from cream-colored.
Marshall amplifier serial numbers made simple Posted on April 25, April 27, by Phil by Phil. These are printed on a sticker and affixed to the back of the amplifier and are comprised of a letter followed by ten numbers followed by another letter: Checking against other amps from the era as well as component markings speakers, potentiometers, transformers can help to confirm a year of production.
Chassis construction transitions from aluminum to steel in late Welcome Dumble Amplifiers to the Amp Archives. These were comprised of nine digits in the format of xx-xxxxx-xx though not always.
Cabinet feet are small dating vintage marshall amps and gray. The watt Major was modified to match the normal panel layout and the active electronics where dropped. JTM block logos changed to gold-plated plastic script, these are fragile and many have been replaced.
Amplifiers from this era must be dated within this time span based on their features, or component manufacturers and codes, including speakers, potentiometers and transformers.
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From until Marshall amplifiers were identified by a four-digit sequential number inside the back panel, reportedly starting with in and reaching at the beginning of Letters were used as date codes to represent the year of production and this letter followed the serial production number. In August of Marshall switched to their current serial number format which contains more information and is easily decoded.
You must be logged in to post a comment. The model number takes the form of four-digits preceded or followed by letter codes describing amplifiers characteristics.
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Dating a Marshall amplifier can be a daunting task for even the most savvy of suitors — Amp Archives is here to help. Starting in the date code letter was moved from the end to the middle of the production code, between the model code and the production number.
First Watt Majors appeared, with treble, bass and volume controls, active tone circuitry and KT88 tubes. Beginning in Marshall abandoned the four-digit numbering system and began using model numbers, sometimes called series numbers and model codes.
These serial numbers can be decoded as follows:.
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