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One thing about SAMS is that they usually rewrote the schematics and renamed everything so it becomes confusing when one tries to compare them to the original. Once you understand that and know what you're looking at it's not a problem. They can actually be easier to read than some originals. Since they are rewritten there are mistakes sometimes but you will come across mistakes in originals as well. Also SAMS usually rewrote the alignment procedures too. Another thing is that many radio manufacturers made updates to their radios. They most likely printed revised schematics but most never released them. So there may be differences from the radio you are working on as compared to the schematics that they released. The problem then is what revision radio do you actually have?  Tram D201As are like that. There were many revisions but only one schematic released. I once had three TRC 458 Navahos that were built within 2 years (1977-1978) that had different cap arrangements on the bottom side of the board but only one schematic was released. GE Superbases and like radios come to mind with their three versions as well as many other radios. Another problem with SAMS is that usually you don't know what revision they wrote their schematics from. If only one was released that is probably what they used. If many were released such as in the case of the Tram Titan II, the one SAMS used was most likely the current one at the time. The one they used for the Titan II was R2 but there was also R3 and R4 later on due to improvements that were made to the radio.