Fender never printed any since there were plenty of leftover AB763 tube charts available and these were used well into 1969.
Although the cosmetics changed, the circuits remained unaltered from the blackface circuits on the earliest silverface amps.
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.
Part of the confusion stems from the lack of any AB568 or AC568 tube charts.
The main focus of this article will be speakers found in Fender amps, but before we get into that topic let’s go over a few other areas first.
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.
One clue that can be used is the ink stamped chassis date code that is usually located in the chassis, but is sometimes found on the underside of the chassis behind the tubes.
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.
It’s been over a year since Part 2 of this series was printed, but that’s because I’ve been busy collecting data.For those readers who may have joined us recently, I am doing some Fender amp research along with Devin Riebe and Greg Huntington.