Mariogert

Dear all, Did any of you manage to find a schematic or draw-up of this OTL-150 amplifiers? I found a set of these with EL-36 tubes in them. I have been to a gifted engineer who almost read the inners of these to check them for me. After thorough read and measurements with the neccessary tools they were switched on one by one through a variac. A few parts were changed to see a more reliable state. one 6LU8 alt. tube collapsed but showd a small crack in the glass so air must have gotten in. Using a 6LU8 from the other amp and realigning again helped. the amp played music on the test bench. I am collecting NOS tubes now to have some stock here and I will get a grip on all soldering which takes time but has to be done. If anyone has a schematic or mod-list, please let me know. Thanx in advance. MarioGert