Fender rhodes dating
If anyone has an amp with a "PA" stamp, please let us know.
Still, I wouldn't be too quick to just glance at that tube chart and accept an "OA" as a January 1965 amp.
After reading Teagle and Sprung's excellent Fender amp book, I took them up on their challenge that maybe someday someone will compile enough serial numbers so that Fender amps can be dated that way. I contacted several Fenders collectors and dealers who were kind enough to supply me with data.These say "Fender Electric Instruments." Depending on the model the use of these pre-CBS panels have been observed on amps as late as August 1965, except for Champs and Vibro Champs which had foil stickers on the back the chassis.