Hey fellas, Im gonna bring the amp to a tech soon (short on cash atm) but I'm wondering what might be wrong with it. My Sunn 2000s is a 1969 with a solid state rectifier. Lately I cant get nearly as much volume out of it as I used to, it distorts rather early as well. I used to be able to not crank it past 4 and a half or so on the volume, but now I cant get any clean headroom. Its weird. I have no idea how old the tubes are....but I'm guessing theyre pretty aged. I'm praying that its not a transformer. Diagnosis??? -Thanks!