Troubleshooting help

I went to listen to my system last night after a long period of being bored with it and for some reason I have to turn up the volume twice as high to get the same volume. Anyone have any idea what gives. You guys have helped out alot over the years as I have blown up various pieces of equipment- thought I would try again. System is Bat Vk 3i, bat vk200, ah tjobe 4000 and apogee stages. Thanks