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The cosmetics of the silverface amps during the transition between circuits was also in transition making it difficult to determine circuit type on cosmetics alone.
The amps during this period could have the earliest style silverface grill cloth or the more familiar silverface grill cloth.
Also, the different component values could be due to a necessary substitution on the production line when a particular value was out of stock. These changes have been observed on tweed, brown/blonde, and blackface models.Early silver face amps: Part 2 went into this topic in some detail, but since that article was printed, I have been asked a of questions about this subject.There still seems to be some confusion about how to distinguish between a silverface Fender amp that has the desirable AB763 circuit and one that has the less-desirable AB568/AC568 circuit.For those readers who may have joined us recently, I am doing some Fender amp research along with Devin Riebe and Greg Huntington.Our research efforts are now in their fourth year (will it ever end? Part 1 and Part 2 of this series can be found in the March 1997 and November 1997 issues of TCG, respectively.