This is a current sale. Although it only says Dynaco's PAS, it is probably PAS3. There are some places where the letters are starting to disappear, I think it's in very good condition overall for a very old amp.
Regarding operation, I connected a CD player to the special terminal and confirmed the sound output. There is a gully, but left and right sound is coming out. This is a fairly old vacuum tube preamplifier, so please purchase with the assumption that maintenance is required. It is sold as is. Please refer to the photo.
This is an American-made vacuum tube preamp from the good old days.