Blackface Princeton Reverb AA764 circuit. Say no more. The Hottest amp on the planet right now! This one is really clean. Tube chart date is June of '67. Cosmetically extremely clean, it has a few minor issues. The vinyl bag the reverb pan sits in is missing, some of the blue molded caps and coin shaped resistors have been replaced. Everything has been saved and come with the amp though. Also has a new grounded AC cord. Tubes include orignal RCA rectifier, newer JJ power tubes (the originals come with) and newer Svetlana, Tung Sol and Raytheons in the preamps. Tranny's all correct. Main is dated 18th week of '67. Output is dated 20th week of '67. Reverb is dated 15th week of '67. Correct Jenson speaker dates 18th week of '66. Everything is functioning including Reverb and Tremolo but missing footswitch. Sounds wonderful as these all do. When you need less than a Deluxe Reverb. This is the secret weapon of Mike Campbell of Heartbreakers and countless other studio musicians.