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This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing.The final line contains a date code of two printed or handwritten letters denoting the amplifier’s production date by year (the first letter) and month (the second letter).Electro-Harmonix used pots from various makers, but they were usually the 24mm size, with 1/4" knob posts.Logarithmic taper pots, or audio pots, will also work for the volume pot and sound better, but they are more expensive than linear.- All vintage USA Big Muffs have source-date codes stamped on the underside of the potentiometer cans, or “pots”.
The pots on the newer USA made E-H Muffs after 1999 do not have date codes.
In general, the USA standard, which I believe came from Japan, is A=log and B= linear.
Fender offers a wide selection of Pure Vintage electronics to players looking to restore or upgrade their guitar or amplifier with classic Fender in mind.
The codes were created by the Electronic Industries Association (EIA) in 1920s to identify the product source and date of manufacture.
The first string of numbers is usually the part number, or sometimes the pot value.
For vintage USA Big muffs, carefully bend back the four tabs on the top/back of the casing on the old pot, slide the casing off, then remove then shaft. Linking to this website is allowed, but copying the text content is strictly prohibited without prior authorization.