A 1957 tweed Vibrolux was reported with a tube chart printed with circuit “5E3” (tweed Deluxe) instead of the correct 5F11 (see photo).
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.
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Thought this was a pretty informative web site, pictures, dates of manufacture, schematics, and more for Vintage Ampeg, Epiphone, Fender, Gibson, Marshall, and Vox amps. Superior Music Another great place for vintage amp info is Vintage Amps LOTS of info, schematics, recording gear etc.
The Fender Amp Guide And here's a Fender Amp ID Link, Serial Numbers, Date Codes, Tubes, etc. Speaking up for those that can't speak for theirself, A.