![]() Some JTM-100 amps from late 1965 have the JMT-45 badge.RS Spares or Drake transformer, rated at 8000 ohms, used in the JTM-45.Handles changed to plastic with larger end cap.JTM-45 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. The model numbers can be somewhat confusing because model numbers such as 1987 or 1959 can be mistakenly interpreted as the production year of the amplifier. ![]() ![]() While there are serial-like numbers during this era, no standard serial number format has been identified. From 1962 until 1964 Marshall amplifiers were identified by a four-digit sequential number inside the back panel, reportedly starting with 1001 in 1962 and reaching 2001 at the beginning of 1964.īeginning in 1965 Marshall abandoned the four-digit numbering system and began using model numbers, sometimes called series numbers and model codes. The earliest Marshall amplifiers were made in 1962 and had no model or serial numbers. Dating a Marshall amplifier can be a daunting task for even the most savvy of suitors - Amp Archives is here to help.
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