Thanks for the information. I know that the Sentura II that used to own wa a 1967, and that the Scepter came later. I also noticed that the Scepter has a mid range boost switch, but ten the 68 Sentura also had the mid range boost. I have copies of the schematics for both amps and I can't see the difference. They both have the same tubes and transformers. Anyone else know any more differences?