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These are marked with EIA code “831” and are most prevalent during the 1966-68 time period.
Some examples include a '66 Princeton Reverb and ’66 Pro Reverb with Better Coil output transformer, a ‘66 Deluxe Reverb and ‘67 Twin Reverb with Better Coil reverb transformer, and a 1968 Vibro Champ with Better Coil trannies.
There is some debate about how to interpret the production code information on late ‘50s to mid-1967 tube charts and Greg Huntington is still working with those.
One thing we know for sure is that production codes can help date an amp to a particular month within a given model run.
I promise the tables will still be there after you finish reading.
Okay, I know you’re all just dying to skip ahead to the serial number tables but try to contain your excitement and read through the article first.
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.They were something to behold, all chatting away while soldering so quickly, it didn't hardly seem like they were looking at the amps.After that the foreman would add the tubes, turn 'em on and set the bias.” Export models – We’ve confirmed that Fender amps were distributed by Hagstrm in Sweden.These are marked with EIA code “606” which is the company number for Schumacher.Well, this universal “truth” was debunked when we found a bunch of amps with transformers made by the Better Coil and Transformers company.
I think in the corners of the boxes were older pots remaining from earlier dates... Like I said, there were 5 or 6 of us at the benches every day.