This 1969 Super Reverb is a transition era piece, which was built directly after the blackface amps were updated to the new Silver design. The tube chart says "AB763", but this is in fact a hybrid version used very briefly from late 67-69, which features a partial cathode biased power section. These are rare amps, and it translates well into a unique sound, very much a progression from the mid 60's, as compared to the less desirable designs of later 70's CBS. Internally, you'll find things are mostly original, with changed power cord and filter caps being the only updates. The rest of the circuit, the transformers, and speakers are all original! The condition shows minor signs of prolonged storage, but real blemishes or road wear is present.