(I’ve also included a few others brands you might encounter as aftermarket installations.) This should help you identify your speaker.You also mentioned that you’re looking for a speaker option that decreases the overall volume of your amp.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.
The code follows the format: = a number from 1 - 52 indicating the week of manufacture. 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.Our Buyer’s guide to vintage Fender amps explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc.Lots of different speakers were used in the blackface and silverface era Fender 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.These date codes will contain two letters of the alphabet which refer to the year and month of production, and may be interpreted as follows: In the absence of the rubber-stamped date codes, EIA numbers taken from the transformers may allow you to determine the date of production of your amp.These numbers always begin with "606" , and are followed by three or four digits in various combinations.On the inside wall of your amp cabinet, there may be a tube location sticker which shows the tube layout, model number, production location etc..There may also be some letter date codes rubber stamped on this sticker.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.Again, I would like to thank everyone who responded to our request for data as outlined in Parts 1 and 2.There are other methods used to date "Silverface" amps, you will need to get the date codes from your speaker frame, tube chart or pots.