Over the course of the 70s, the Japanese output improved dramatically, and in many ways these early 70s models are a low point for the brand. These new Epiphones were based on existing Matsumoku guitars, sharing body shapes, and hardware, but the Epiphone line was somewhat upgraded, with inlaid logos and a 2x2 peghead configuration. The Matsumoku factory had been producing guitars for export for some time, but the 1820 bass (alongside a number of guitar models and the 5120 electric acoustic bass) were the first Epiphone models to be made there. Thank you.By the end of the 1960s, a decision had been made to move Epiphone guitar production from the USA (at the Kalamazoo plant where Gibson guitars were made), to Matsumoto in Japan, creating a line of guitars and basses significantly less expensive than the USA-built models (actually less than half the price). Speaker Implementation and Amplifier Configurations If you would like to add some info to this list, (any company, any model) feel free to write us with the info. Anything else is at the discretion of the manufacturer. The EIA only specifies manufacturer and year/week code. Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc. There are 2 acceptable methods of displaying the EIA date code, with or without a hyphen between the manufacture code and the year/week code. In later years, the EIA converted to a 4 digit date code so the year could be easily identified. The year is confusing because it is only a single digit. So, the speaker in the image above would have been made by Jensen (220) during the 27th week of 1951 or 1961. Here is a list of some of the speaker manufacturers and their EIA codes: Credence It is called the ‘Manufacture Date Code’. The 6 digit code indicates what manufacturer made the speaker and when it was made. The picture is a section of the basket rim of a speaker. You might find some of the information useful in determining which speaker would be best suited to your application. This page is a collection of odds and ends information relating to speakers and speaker implementation. Cabinet Covering Swatches (Includes Handle Pics).
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