: HI Yes I own several Hilgen amps and did some research Hilgen was a small amp company from New Jersey in the early sixties they only made a few models single twelve and 2- twelve they made one cool 2-12 model that had a head that swiveled down into the cabinet the circuits look similar to ampeg but they were not affiliated with them what models do you have I have a catalog that tells the correct tubes etc E mail mer if you need more info