The following chart, was originally printed in VG magazine, by Gerald Weber.
If you see any data that is not listed here or notice any errors, for 1970’s and earlier Fender amps, please send us an email and we will update the chart.
The earlier circuit boards are green in color and are noted for a "darker," more bass-inflected tone.Tweed refers to the two-tone woven fabric that covered many early amplifiers.On early amps, this material was varnished to make it a more durable covering.I would have to collect data for ALL the amp types, just to work out how many were made of mine.
Then I became aware of the amazing work Greg Gagliano had been doing since the 1990s - the summary of his latest results are here - and that his research stopped just before the Rivera-era. However for this range of amps at least, I reckon it's not just a policy of withholding company-confidential information. It's no criticism of Fender to suggest that they were too busy making great amps to keep records just so some amateur can use them thirty years later.Although the dates derived using the charts below will likely be a good approximation, they should not be considered exact.