[cctalk] Re: IBM 727 tape drive

On Wed, 20 Sep 2023, Van Snyder wrote: That would be 729 drives (the transistorized successor of the 727). We now have the 727 here (a 727 model III, built in 1957). It is complete and in a very good shape. It only needs some normal cleaning. The belts, the bearings and even the "flappers" (vacuum switches) seem to be fine. Now, the need for 727 manuals has become even bigger :-)) A bit of information can be deduced from reading across the available 727 CE manual, the 753 tape control manual and the 700 series component circuits manual. But they provide only small pieces that don't form the whole, especially not the wiring and module charts. And the interesting part will be to build the DC power supply for the many voltages (-270V, -130V, -60V, +140V, +270V) and the heater supply. And building a tape controller... Christian