The Fender musical revolution started before the birth of rock music, just after the end of WW2.
Since his early teens Leo Fender had an interest in electronics, and when he grew up, Leo made a career for himself fixing and building PA systems for musicians, opening his own shop in California.
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These were easily the most powerful amplifiers commercially produced back then.
They all had the classic features we're familiar with now: heavy steel chassis, chromed control plates, and heavy pine cases covered with tweed fabric.
In order to date a Fender amp or provide the value, you need to know one of the below: * The 2 letter date code rubber stamped on the Tube Chart, or * The 2 letter date code on the QA Sticker, or * The Transformer Number that starts with “606-XX-XX”, with the 3 or 4 Xs being the unknown numbers that need to be provided by the owner of the amplifier asking the question.