OK, I couldn't get anyone to give me any help on these amps. So lets see what forty years of medical electronics can do. Most of the tube were broken or had there stems broken off. So it each amp has three 6sn7's and had four KT90's.When I removed the bottom covers I was very pleasantly surprised. This amp is laid out beautifully. Pushed the stems through and did a fine visual checkout. everything seemed to be in great shape. I bought eight KT88's and installed those. 2 of the 6SN7's had stems broken off. I had two in stock because since I retired I sell tubes. Install a GE and a Zenith.
After carrying them upstairs and getting a hernia I put them on one of the Karlsons just of testing. I had my fingers crossed that they would work. KT88's aren't cheap. Disconnected the Mc240 and ran inputs and outputs to the ASL's. These amps sound just great. I'm very happy with them considering They were purchased t an auction of $325.00. I think these will be keepers and sell the Mc240 and bank some cash.