If it’s a silverface amp, that 6 indicates 1976. Now if it’s a blackface amp, it’s a safe bet that 6 means 1966. In the above example, the transformer was made in either 1966 or 1976, week 45. The first of the three digits tells us the last digit of the year (unfortunately not decade specific) and the last two numbers tell us the week. The date is in the last three digits, after the 606 –. Most post tweed Fenders had trannys manufactured by Schumacher. If your tweed champ is stamped HH, it was made in 1958/August.Īnother way to get a close estimate of when your amp was made is to read the codes on the transformers. So if your blackface amp has a date code stamp of OB, it was made in 1965/February. The tube chart date code works like this: the first letter indicates the year and the second letter indicates the month. Up until the end of the blackface era (1967), all amps left the factory with a tube chart that had a two letter date code stamped on it. There are some exceptions and some overlap, but the general idea is this: Tweeds (early 50’s to very early 60s), Browns (1960 – 1962), Blondes (1962 – 1963), Blackface (1963 – 1967), and Silverface (1967 – 1981). First, to get a general idea,there’s the appearance/style of the amp. There are some easy ways to find out when your vintage Fender was manufactured. AB165 to AA864 'plus' tweed preamp for BLACKFACE AB165."1/2 Blackface" Mod for Ultralinear Fenders.
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